JP4139433B1 - Image signal correction method - Google Patents

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JP4139433B1
JP4139433B1 JP2007129926A JP2007129926A JP4139433B1 JP 4139433 B1 JP4139433 B1 JP 4139433B1 JP 2007129926 A JP2007129926 A JP 2007129926A JP 2007129926 A JP2007129926 A JP 2007129926A JP 4139433 B1 JP4139433 B1 JP 4139433B1
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忠幸 廿楽
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スクルド・エンタープライズ有限会社
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Abstract

【課題】第１色盲を患う者は「濃い赤」（Ｒ＝２５５、Ｇ＝０、Ｂ＝０）は、ほとんど「黒」に見えて、「黒」と見分けられない。さらに暖色系の「濃い緑」は、「茶色」とほとんど見分けることが困難である。
【解決手段】入力信号が「濃い赤」の場合は、「濃い赤」を検出する検出手段と、その検出結果に基づき補正信号を生成する補正信号生成手段と、その補正信号により入力信号を補正して出力する補正手段とにより、少しだけ白を混ぜた「明るい赤」（Ｒ＝２５５、Ｇ＝５１、Ｂ＝５１）や短波長（オレンジ）寄りの「朱色」（Ｒ＝２５５、Ｇ＝５１、Ｂ＝０）に補正した画像信号とすることを実行する画像信号補正手段の動作方法。For a person suffering from first color blindness, “dark red” (R = 255, G = 0, B = 0) almost looks “black” and cannot be distinguished from “black”. Furthermore, the warm-colored “dark green” is almost difficult to distinguish from “brown”.
When an input signal is "dark red", a detecting means for detecting "dark red", a correction signal generating means for generating a correction signal based on the detection result, and the input signal is corrected by the correction signal. And a correction means to output “bright red” (R = 255, G = 51, B = 51) mixed with a little white and “vermilion” (R = 255, G =) near the short wavelength (orange). 51, an operation method of the image signal correcting means for executing the image signal corrected to B = 0).

Description

本発明は、表示装置等に利用されている画像信号の信号補正方法に関する。   The present invention relates to a signal correction method for an image signal used in a display device or the like.

従来の表示装置は、３原色信号であるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号にて、被写体の色を忠実に再現する処理が行われていた。
又、画質調整処理として所望の色を調整することが可能であったが、一定の割合で補正を行うことや、特定の色を特定の色に変換すること等が行われている。
尚、表示装置にて一般的に採用されている画像信号としてＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号や、Ｙ（輝度信号）、ＣｂＣｒ（色）信号等がある。これらのＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号等の表し方としては、デジタルで表した一例として８ｂｉｔで表すと０から２５５、アナログで表すと０から１の実数、さらに０％から１００％等の表し方がある。さらには、ｘｖＹＣＣ規格の様な、さらに広い色域を表すことも規格化されている。つまりアナログで表すと０以下の負の実数、若しくは１以上の実数で表わされる色域も利用されている。
以後表記は、特にことわり無き場合は、デジタル８ｂｉｔで量子化した０〜２５５で表記する。小数点以下は四捨五入して整数で表すものとする。 In the conventional display device, processing for faithfully reproducing the color of the subject is performed using the R (red) signal, the G (green) signal, and the B (blue) signal which are three primary color signals.
Moreover, although it was possible to adjust a desired color as the image quality adjustment processing, correction is performed at a certain ratio, a specific color is converted into a specific color, or the like.
Note that there are R (red) signal, G (green) signal, B (blue) signal, Y (luminance signal), CbCr (color) signal and the like as image signals generally adopted in the display device. As a way of expressing these R (red) signal, G (green) signal, B (blue) signal, etc., as an example expressed in digital, a real number from 0 to 255 when expressed in 8 bits, 0 to 1 when expressed in analog, Furthermore, there is a way of expressing from 0% to 100%. Furthermore, it is standardized to represent a wider color gamut, such as the xvYCC standard. That is, a color gamut represented by a negative real number of 0 or less or a real number of 1 or more is also used.
In the following description, unless otherwise specified, 0 to 255, which is quantized with digital 8 bits, is used. The numbers after the decimal point are rounded and expressed as an integer.

この３原色信号であるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号からなる画像信号を、忠実に再現することは健常者にとっては好ましいことである。
しかし色盲を患う者には、必ずしも色を忠実に再現するのが良いとは限らない。例えば第１色盲を患う者は「濃い赤」（Ｒ＝２５５、Ｇ＝０、Ｂ＝０）は、ほとんど「黒」に見える。さらに緑は、黄色みがかった暖色系の緑から青みがかった寒色系の緑まで、様々な色あいがある。この中で暖色系の濃い緑は、色盲の人には茶色とほとんど見分けがつかない。鮮やかな緑である抹茶色は、色盲の人には真っ茶色に見えることがある。日本の夏の広葉樹林の深い緑も、茶色と見分けがつかない。
さらに、視覚の基本特性である分光視感度特性は加齢とともに短波長側、すなわち青色系統の感度が低下する。このため高齢者は青色系統の色画像が見づらいものである。
又、あらかじめ登録された色盲 および色弱者にとって誤認傾向のある色に関する情報を参照して、入力された画像データに誤認要因となる色が含まれているか判断し画像データの色を所定の色に変換する考案がされている。
特開２００４−２６６８２１ 特開２００６−２４６０７２ It is preferable for a healthy person to faithfully reproduce the image signal composed of the R (red) signal, the G (green) signal, and the B (blue) signal, which are the three primary color signals.
However, it is not always good to reproduce color faithfully for those who suffer from color blindness. For example, a person suffering from the first color blindness looks almost “black” in “dark red” (R = 255, G = 0, B = 0). In addition, green has a variety of colors, from a warm yellowish green to a bluish cold green. Among them, the warm greenish dark green is almost indistinguishable from brown for people with color blindness. A bright green, brownish brown, may appear brown to people with color blindness. The deep green of the Japanese broad-leaved forest is indistinguishable from brown.
Furthermore, the spectral sensitivity characteristic, which is a basic visual characteristic, decreases with increasing age on the short wavelength side, that is, the sensitivity of the blue color system. For this reason, it is difficult for elderly people to see blue color images.
In addition, referring to pre-registered information on color blindness and colors that tend to be mistaken for color-blind people, it is judged whether the input image data contains a color that causes a misidentification, and the color of the image data is changed to a predetermined color. There is a device to convert.
JP 2004-266821 A JP 2006-246072 A

３原色信号であるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号からなる画像信号を、忠実に再現することは健常者にとっては好ましいことである。
しかし色盲を患う者には、必ずしも色を忠実に再現するのが良いとは限らない。
例えば第１色盲を患う者は「濃い赤」（Ｒ＝２５５、Ｇ＝０、Ｂ＝０）は、ほとんど「黒」に見える。この「濃い赤」は使わずに、少しだけ白を混ぜた「明るい赤」（Ｒ＝２５５、Ｇ＝５１、Ｂ＝５１）や短波長（オレンジ）寄りの「朱色」（Ｒ＝２５５、Ｇ＝５１、Ｂ＝０）を使うと，同じ赤でも緑視物質や青視物質を刺激することが可能となり、黒と分別が可能になる。例えば黒い文字列の中でも「明るい赤」の文字であれば強調され、暗い背景の中でも文字が読めるようになる。
さらに緑は、黄色みがかった暖色系の緑から青みがかった寒色系の緑まで、様々な色あいがある。この中で暖色系の濃い緑は、色盲の人には茶色とほとんど見分けがつかない。鮮やかな緑である抹茶色は、色盲の人には真っ茶色に見えることがある。日本の夏の広葉樹林の深い緑も、茶色と見分けがつかない。一方道路標識の緑のように青みが強い緑は、茶色と間違えにくい。また明るい緑は，暖色系だと黄色や赤と間違えることがあるが、青みが強ければ間違えにくい。
道路標識や交通信号は、同じ緑でも青みの強い色に限ることが定められている。
又、視覚の基本特性である分光視感度特性は加齢とともに短波長側、すなわち青色系統の感度が低下する。このため高齢者は青色系統の色画像が見づらいものである。
この発明は、上記の事情に鑑みてなされたものであり、視覚に病を患う者に見やすい画像に補正して表示することや、高齢者の青色系統の色画像が見づらいものを補正して表示し、且つ健常者にとっても違和感の少ない表示を可能とすること、が可能な表示装置のための信号補正方法の提供を目的とする。
つまり、画像信号の３原色信号であるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号のそれぞれの値が、所望の条件つまり上記の不具合の条件に合致するとき、それぞれの信号の値に応じて補正量を変えて補正することができる信号補正方法である。 It is preferable for a healthy person to faithfully reproduce an image signal composed of an R (red) signal, a G (green) signal, and a B (blue) signal, which are three primary color signals.
However, it is not always good to reproduce color faithfully for those who suffer from color blindness.
For example, a person suffering from the first color blindness looks almost “black” in “dark red” (R = 255, G = 0, B = 0). This “dark red” is not used, but “bright red” (R = 255, G = 51, B = 51) mixed with a little white or “vermilion” (R = 255, G) closer to the short wavelength (orange) = 51, B = 0), it is possible to stimulate the green and blue vision substances even with the same red color, and it is possible to distinguish from black. For example, if a character string is “bright red” in a black character string, it is emphasized, and the character can be read even in a dark background.
In addition, green has a variety of colors, from a warm yellowish green to a bluish cold green. Among them, the warm greenish dark green is almost indistinguishable from brown for people with color blindness. A bright green, brownish brown, may appear brown to people with color blindness. The deep green of the Japanese broad-leaved forest is indistinguishable from brown. On the other hand, green with a strong bluish color, like the green on the road sign, is unlikely to be mistaken for brown. In addition, bright green may be mistaken for yellow or red if it is a warm color, but it is difficult to make a mistake if the bluish color is strong.
Road signs and traffic signals are limited to the same green color but with a strong bluish color.
In addition, the spectral sensitivity characteristic, which is a basic visual characteristic, decreases with the lapse of time on the short wavelength side, that is, the sensitivity of the blue system. For this reason, it is difficult for elderly people to see blue color images.
The present invention has been made in view of the above circumstances, and corrects and displays an image that is easy to see for a visually ill person, or corrects and displays an image in which an elderly person's blue color image is difficult to see. In addition, it is an object of the present invention to provide a signal correction method for a display device capable of enabling a display with less discomfort for a healthy person.
That is, when the respective values of the R (red) signal, G (green) signal, and B (blue) signal, which are the three primary color signals of the image signal, match a desired condition, that is, the above-described problem condition, This is a signal correction method that can be corrected by changing the correction amount according to the value of.

本発明は、入力される画像信号の３原色信号であるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号のそれぞれの値が、視覚に病を患う者が認識し難い色の条件に合致するかを検出し、その条件に合致することが検出された際は、入力される画像信号の値に応じて補正をかけるための補正信号を生成し、入力の画像信号に補正を行い出力することを最も主要な特徴とする。その詳細は以下に示す。   In the present invention, the values of the R (red) signal, G (green) signal, and B (blue) signal, which are the three primary color signals of the input image signal, are colors that are difficult for a person suffering from a visual disease to recognize. If it is detected whether the condition is met, and if it is detected that the condition is met, a correction signal is generated for correction according to the value of the input image signal, and the input image signal is corrected. The most important feature is to perform and output. Details are shown below.

請求項１に記載の発明は、３原色信号であるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号からなる画像信号を入力するＲ入力端子、Ｇ入力端子、Ｂ入力端子と、
Ｒ（赤）信号用の所望する基準信号を生成するＲ基準信号生成手段と
Ｇ（緑）信号用の所望する基準信号を生成するＧ基準信号生成手段と
Ｂ（青）信号用の所望する基準信号を生成するＢ基準信号生成手段と
前記Ｒ入力端子とＲ基準信号生成手段とに接続されたＲ比較手段と
前記Ｇ入力端子とＧ基準信号生成手段とに接続されたＧ比較手段と
前記Ｂ入力端子とＢ基準信号生成手段とに接続されたＢ比較手段と
それぞれの比較手段の結果の論理積の演算を行う論理積手段とを備え、
前記それぞれの入力端子から入力された画像信号と、それぞれの基準信号生成手段にて生成された基準信号とをそれぞれ比較する、つまり入力された画像信号が所望する条件を満たすかを検出する検出手段と、
前記Ｒ入力端子とＧ入力端子と検出手段とに接続され、その入力端子から入力されるＲ（赤）信号とＧ（緑）信号と検出結果とに基づき補正をかけるための、Ｇ（緑）信号用の補正信号を生成するＧ補正信号生成手段と、
前記Ｒ入力端子とＢ入力端子と検出手段とに接続され、その入力端子から入力されるＲ（赤）信号とＢ（青）信号と検出結果とに基づき補正をかけるための、Ｂ（青）信号用の補正信号を生成するＢ補正信号生成手段と、を備える補正信号生成手段と、
前記Ｇ入力端子と検出手段とＧ補正信号生成手段とに接続され、検出結果と補正信号とに基づきＧ入力端子から入力されるＧ（緑）信号の補正を行うＧ補正手段と、
前記Ｂ入力端子と検出手段とＢ補正信号生成手段とに接続され、検出結果と補正信号とに基づきＢ入力端子から入力されるＢ（青）信号の補正を行うＢ補正手段と、を備える補正手段と、
前記Ｒ入力端子に接続されたＲ（赤）信号を出力するＲ出力端子と、
前記Ｇ補正手段に接続されたＧ（緑）信号を出力するＧ出力端子と、
前記Ｂ補正手段に接続されたＢ（青）信号を出力するＢ出力端子と、を備えた画像信号補正手段の動作方法であって、
当該検出手段が、所望する条件である
入力されるＲ（赤）信号がＲ基準信号生成手段で生成される基準信号の値より大きく、且つ、
入力されるＧ（緑）信号がＧ基準信号生成手段で生成される基準信号の値より小さく、且つ、
入力されるＢ（青）信号がＢ基準信号生成手段で生成される基準信号の値より小さいことを検出し、その検出結果を補正信号生成手段に出力するステップと、
当該補正信号生成手段のＧ補正信号生成手段が、前記検出手段の所望する条件が満たされた情報である検出結果に基づき、検出手段からの所望する条件が満たされない場合には補正信号は生成せず、検出手段からの所望する条件が満たされた場合には補正信号を生成し、且つ、入力されるＲ（赤）信号の値とＧ（緑）信号の値とに応じて一意に値が決定される、つまりＲ（赤）信号の値とＧ（緑）信号の値との大小に関連して補正信号の値の大小が決定される補正信号を生成するステップと、
当該補正信号生成手段のＢ補正信号生成手段が、前記検出手段の所望する条件が満たされた情報である検出結果に基づき、検出手段からの所望する条件が満たされない場合には補正信号は生成せず、検出手段からの所望する条件が満たされた場合には補正信号を生成し、且つ、入力されるＲ（赤）信号の値とＢ（青）信号の値とに応じて一意に値が決定される、つまりＲ（赤）信号の値とＢ（青）信号の値との大小に関連して補正信号の値の大小が決定される補正信号を生成するステップと、
当該補正手段のＧ補正手段が、前記検出手段の所望する条件が満たされた情報である検出結果とＧ補正信号生成手段にて生成された補正信号に基づき、入力信号のＧ（緑）信号を前記Ｇ補正信号生成手段で生成した補正信号にて補正して、補正後のＧ（緑）信号を出力するステップ、
当該補正手段のＢ補正手段が、前記検出手段の所望する条件が満たされた情報である検出結果とＢ補正信号生成手段にて生成された補正信号に基づき、入力信号のＢ（青）信号を前記Ｂ補正信号生成手段で生成した補正信号にて補正して、補正後のＢ（青）信号を出力するステップ、
を実行することを特徴とする画像信号補正手段の動作方法である。
この発明により、画像信号の３原色信号であるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号のそれぞれの値が、所望する条件であるとき、Ｒ（赤）信号の値とＧ（緑）信号の値とに応じた補正や、Ｒ（赤）信号の値とＢ（青）信号の値とに応じた補正を、行う事ができる。
従って、「濃い赤」であるＲ（赤）信号＝２５５、Ｇ（緑）信号＝０、Ｂ（青）信号＝０を検出して、少しだけ白を混ぜた「明るい赤」例えば、Ｒ（赤）信号＝２５５、Ｇ（緑）信号＝５１、Ｂ信号（青）＝５１や、短波長（オレンジ）寄りの「朱色」（Ｒ（赤）信号＝２５５、Ｇ（緑）信号＝５１、Ｂ（青）信号＝０）に補正することができる。 According to the first aspect of the present invention, there are provided an R input terminal, an G input terminal, and a B input terminal for inputting an image signal composed of an R (red) signal, a G (green) signal, and a B (blue) signal which are three primary color signals. ,
R reference signal generating means for generating a desired reference signal for R (red) signal, G reference signal generating means for generating a desired reference signal for G (green) signal, and desired reference for B (blue) signal B reference signal generating means for generating a signal, R comparing means connected to the R input terminal and R reference signal generating means, G comparing means connected to the G input terminal and G reference signal generating means, and B B comparison means connected to the input terminal and the B reference signal generation means, and AND means for calculating the logical product of the results of the respective comparison means,
Detection means for comparing the image signals input from the respective input terminals with the reference signals generated by the respective reference signal generation means, that is, detecting whether the input image signal satisfies a desired condition When,
G (green) connected to the R input terminal, the G input terminal, and the detection means, and for applying correction based on the R (red) signal, the G (green) signal and the detection result input from the input terminal. G correction signal generating means for generating a correction signal for the signal;
B (blue) connected to the R input terminal, B input terminal, and detecting means, and for applying correction based on the R (red) signal, B (blue) signal and the detection result inputted from the input terminal. A correction signal generation means comprising: a B correction signal generation means for generating a correction signal for the signal;
G correction means connected to the G input terminal, detection means, and G correction signal generation means, for correcting a G (green) signal input from the G input terminal based on a detection result and a correction signal;
B correction means connected to the B input terminal, detection means, and B correction signal generation means, and for correcting a B (blue) signal input from the B input terminal based on the detection result and the correction signal. Means,
An R output terminal for outputting an R (red) signal connected to the R input terminal;
A G output terminal for outputting a G (green) signal connected to the G correction means;
A B output terminal for outputting a B (blue) signal connected to the B correction means, and an operation method of the image signal correction means,
The detection means has an input R (red) signal, which is a desired condition, greater than the value of the reference signal generated by the R reference signal generation means, and
The input G (green) signal is smaller than the value of the reference signal generated by the G reference signal generating means, and
Detecting that the input B (blue) signal is smaller than the value of the reference signal generated by the B reference signal generating means, and outputting the detection result to the correction signal generating means;
The G correction signal generation unit of the correction signal generation unit generates a correction signal when the desired condition from the detection unit is not satisfied based on the detection result that is information satisfying the condition desired by the detection unit. First, when a desired condition from the detection means is satisfied, a correction signal is generated, and the value is uniquely determined according to the input R (red) signal value and G (green) signal value. Generating a correction signal that is determined, that is, the magnitude of the value of the correction signal is determined in relation to the magnitude of the value of the R (red) signal and the value of the G (green) signal;
The correction signal generation unit of the correction signal generation unit generates a correction signal based on a detection result that is information satisfying a condition desired by the detection unit when a desired condition from the detection unit is not satisfied. First, when a desired condition from the detection means is satisfied, a correction signal is generated, and the value is uniquely determined according to the input R (red) signal value and B (blue) signal value. Generating a correction signal that is determined, that is, the magnitude of the value of the correction signal is determined in relation to the magnitude of the value of the R (red) signal and the value of the B (blue) signal;
The G correction means of the correction means generates a G (green) signal as an input signal based on a detection result that is information satisfying a condition desired by the detection means and a correction signal generated by the G correction signal generation means. Correcting with the correction signal generated by the G correction signal generating means and outputting a corrected G (green) signal;
The B correction unit of the correction unit calculates the B (blue) signal of the input signal based on the detection result that is information satisfying the condition desired by the detection unit and the correction signal generated by the B correction signal generation unit. Correcting with the correction signal generated by the B correction signal generating means and outputting a corrected B (blue) signal;
Is an operation method of the image signal correcting means.
According to the present invention, when the respective values of the R (red) signal, the G (green) signal, and the B (blue) signal, which are the three primary colors of the image signal, satisfy the desired conditions, the value of the R (red) signal Correction according to the value of the G (green) signal and correction according to the value of the R (red) signal and the value of the B (blue) signal can be performed.
Accordingly, R (red) signal = 255, G (green) signal = 0, and B (blue) signal = 0, which are “dark red”, are detected, and “bright red” in which a little white is mixed, for example, R ( Red) signal = 255, G (green) signal = 51, B signal (blue) = 51, “red” near the short wavelength (orange) (R (red) signal = 255, G (green) signal = 51, B (blue) signal = 0).

請求項２に記載の発明は、３原色信号であるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号からなる画像信号を入力するＲ入力端子、Ｇ入力端子、Ｂ入力端子と、
Ｇ（緑）信号用の所望する基準信号を生成するＧ基準信号生成手段と
Ｂ（青）信号用の所望する基準信号を生成するＢ基準信号生成手段と
前記Ｇ入力端子とＧ基準信号生成手段とに接続されたＧ比較手段と
前記Ｂ入力端子とＢ基準信号生成手段とに接続されたＢ比較手段と、を備え、
前記それぞれの入力端子から入力された画像信号と、それぞれの基準信号生成手段にて生成された基準信号とをそれぞれ比較する、つまり入力された画像信号が所望する条件を満たすかを検出する検出手段と、
前記Ｒ入力端子とＧ入力端子と検出手段のＧ比較手段とに接続され、その入力端子から入力されるＲ（赤）信号とＧ（緑）信号と検出結果とにより補正をかけるための、Ｇ（緑）信号用の補正信号を生成するＧ補正信号生成手段と、
前記Ｒ入力端子とＢ入力端子と検出手段のＢ比較手段とに接続され、その入力端子から入力されるＲ（赤）信号とＢ（青）信号と検出結果とにより補正をかけるための、Ｂ（青）信号用の補正信号を生成するＢ補正信号生成手段と、を備える補正信号生成手段と、
前記Ｇ補正信号生成手段とＧ入力端子とに接続され、Ｇ補正信号生成手段にて生成された補正信号に基づきＧ入力端子から入力されるＧ（緑）信号の補正を行うＧ補正手段と、
前記Ｂ補正信号生成手段とＢ入力端子とに接続され、Ｂ補正信号生成手段にて生成された補正信号に基づきＢ入力端子から入力されるＢ（青）信号の補正を行うＢ補正手段と、を備える補正手段と、
前記Ｒ入力端子に接続されたＲ（赤）信号を出力するＲ出力端子と、
前記Ｇ補正手段に接続されたＧ（緑）信号を出力するＧ出力端子と、
前記Ｂ補正手段に接続されたＢ（青）信号を出力するＢ出力端子と、を備えた画像信号補正手段の動作方法であって、
当該検出手段のＧ比較手段が、所望する条件である入力されるＧ（緑）信号がＧ基準信号生成手段で生成される基準信号の値より小さいことを検出し、その検出結果をＧ補正信号生成手段に出力するステップと、
当該検出手段のＢ比較手段が、所望する条件である入力されるＢ（青）信号がＢ基準信号生成手段で生成される基準信号の値より小さいことを検出し、その検出結果をＢ補正信号生成手段に出力するステップと、
当該補正信号生成手段のＧ補正信号生成手段が、前記検出手段のＧ比較手段からの所望する条件が満たされた情報である検出結果に基づき、入力されるＧ（緑）信号がＧ（緑）信号用の基準信号より大きい場合には補正信号は生成せず、入力されるＧ（緑）信号がＧ（緑）信号用の基準信号より小さい場合には補正信号を生成し、且つ、入力されるＲ（赤）信号の値とＧ（緑）信号の値とに応じて一意に値が決定される、つまりＲ（赤）信号の値とＧ（緑）信号の値との大小に関連して補正信号の値の大小が決定される補正信号を生成するステップと、
当該補正信号生成手段のＢ補正信号生成手段が、前記検出手段のＢ比較手段からの所望する条件が満たされた情報である検出結果に基づき、入力されるＢ（青）信号がＢ（青）信号用の基準信号より大きい場合には補正信号は生成せず、入力されるＢ（青）信号がＢ（青）信号用の基準信号より小さい場合には補正信号を生成し、且つ、入力されるＲ（赤）信号の値とＢ（青）信号の値とに応じて一意に値が決定される、つまりＲ（赤）信号の値とＢ（青）信号の値との大小に関連して補正信号の値の大小が決定される補正信号を生成するステップと、
当該補正手段のＧ補正手段が、前記Ｇ補正信号生成手段にて生成された補正信号に基づき、入力されたＧ（緑）信号を前記Ｇ補正信号生成手段で生成した補正信号にて補正して、補正後のＧ（緑）信号を出力するステップ、
当該補正手段のＢ補正手段が、前記Ｂ補正信号生成手段にて生成された補正信号に基づき、入力されたＢ（青）信号を前記Ｂ補正信号生成手段で生成した補正信号にて補正して、補正後のＢ（青）信号を出力するステップ、
を実行することを特徴とする画像信号補正手段の動作方法である。
この発明により、画像信号の３原色信号であるＲ（赤）、Ｇ（緑）信号、Ｂ（青）信号のそれぞれの値が、所望する条件であるとき、それぞれの信号の値に応じて補正量を変えて補正することができる。
つまりＧ（緑）信号が所望する基準信号値以下を検出したときには、Ｒ（赤）信号の値とＧ（緑）信号の値とに応じた値の補正を行う事ができる。
さらにＢ（青）信号が所望する基準信号値以下を検出したときには、Ｒ（赤）信号の値とＢ（青）信号の値とに応じた値の補正を行う事ができる。 The invention according to claim 2 includes an R input terminal, an G input terminal, and a B input terminal for inputting an image signal composed of an R (red) signal, a G (green) signal, and a B (blue) signal which are three primary color signals. ,
G reference signal generating means for generating a desired reference signal for G (green) signal, B reference signal generating means for generating a desired reference signal for B (blue) signal, the G input terminal, and the G reference signal generating means And a G comparison means connected to the B input means and a B comparison means connected to the B input terminal and the B reference signal generation means,
Detection means for comparing the image signals input from the respective input terminals with the reference signals generated by the respective reference signal generation means, that is, detecting whether the input image signal satisfies a desired condition When,
G is connected to the R input terminal, the G input terminal, and the G comparison means of the detection means, and is used to correct by the R (red) signal, the G (green) signal and the detection result inputted from the input terminal. G correction signal generation means for generating a correction signal for (green) signal;
B is connected to the R input terminal, the B input terminal, and the B comparison means of the detection means, and is used to make corrections based on the R (red) signal, the B (blue) signal and the detection result input from the input terminal. A correction signal generating means comprising: a B correction signal generating means for generating a correction signal for (blue) signal;
G correction means connected to the G correction signal generation means and the G input terminal, and for correcting a G (green) signal input from the G input terminal based on the correction signal generated by the G correction signal generation means;
B correction means connected to the B correction signal generating means and the B input terminal, for correcting a B (blue) signal input from the B input terminal based on the correction signal generated by the B correction signal generating means; Correction means comprising:
An R output terminal for outputting an R (red) signal connected to the R input terminal;
A G output terminal for outputting a G (green) signal connected to the G correction means;
A B output terminal for outputting a B (blue) signal connected to the B correction means, and an operation method of the image signal correction means,
The G comparison means of the detection means detects that the input G (green) signal, which is a desired condition, is smaller than the value of the reference signal generated by the G reference signal generation means, and the detection result is used as a G correction signal. Outputting to the generating means;
The B comparison means of the detection means detects that the input B (blue) signal, which is a desired condition, is smaller than the value of the reference signal generated by the B reference signal generation means, and the detection result is used as the B correction signal. Outputting to the generating means;
The G correction signal generation means of the correction signal generation means inputs the G (green) signal to be G (green) based on the detection result which is information satisfying the desired condition from the G comparison means of the detection means. When the signal is larger than the reference signal for signal, no correction signal is generated. When the input G (green) signal is smaller than the reference signal for G (green) signal, the correction signal is generated and input. The value is uniquely determined according to the value of the R (red) signal and the value of the G (green) signal, that is, it is related to the magnitude of the value of the R (red) signal and the value of the G (green) signal. Generating a correction signal in which the magnitude of the value of the correction signal is determined;
The B correction signal generation means of the correction signal generation means is based on a detection result which is information satisfying a desired condition from the B comparison means of the detection means, and the input B (blue) signal is B (blue). When the signal is larger than the signal reference signal, no correction signal is generated. When the input B (blue) signal is smaller than the reference signal for B (blue) signal, the correction signal is generated and input. The value is uniquely determined according to the value of the R (red) signal and the value of the B (blue) signal, that is, it is related to the magnitude of the value of the R (red) signal and the value of the B (blue) signal. Generating a correction signal in which the magnitude of the value of the correction signal is determined;
The G correction unit of the correction unit corrects the input G (green) signal with the correction signal generated by the G correction signal generation unit based on the correction signal generated by the G correction signal generation unit. Outputting a corrected G (green) signal;
Based on the correction signal generated by the B correction signal generation unit, the B correction unit of the correction unit corrects the input B (blue) signal with the correction signal generated by the B correction signal generation unit. Outputting a corrected B (blue) signal;
Is an operation method of the image signal correcting means.
According to the present invention, when the values of the R (red), G (green), and B (blue) signals, which are the three primary color signals of the image signal, satisfy the desired conditions, correction is performed according to the values of the respective signals. It can be corrected by changing the amount.
That is, when the G (green) signal is detected to be equal to or less than the desired reference signal value, the value corresponding to the R (red) signal value and the G (green) signal value can be corrected.
Further, when the B (blue) signal is detected to be equal to or less than the desired reference signal value, the value can be corrected according to the R (red) signal value and the B (blue) signal value.

請求項３に記載の発明は、３原色信号であるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号からなる画像信号を入力するＲ入力端子、Ｇ入力端子、Ｂ入力端子と、
Ｒ（赤）信号用の所望する基準信号を生成するＲ基準信号生成手段と
Ｇ（緑）信号用の所望する基準信号を生成するＧ基準信号生成手段と
Ｂ（青）信号用の所望する基準信号を生成するＢ基準信号生成手段と
前記Ｒ入力端子とＲ基準信号生成手段とに接続されたＲ比較手段と
前記Ｇ入力端子とＧ基準信号生成手段とに接続されたＧ比較手段と
前記Ｂ入力端子とＢ基準信号生成手段とに接続されたＢ比較手段と
それぞれの比較手段の結果の論理積の演算を行う論理積手段と、を備え、
前記それぞれの入力端子から入力された画像信号と、それぞれの基準信号生成手段にて生成された基準信号とをそれぞれ比較する、つまり入力された画像信号が所望する条件を満たすかを検出する検出手段と、
前記Ｇ入力端子とＢ入力端子と検出手段とに接続され、その入力端子から入力されるＧ（緑）信号とＢ（青）信号と検出結果とに基づき補正をかけるための、Ｂ（青）信号用の補正信号を生成するＢ補正信号生成手段を備える補正信号生成手段と、
前記Ｂ入力端子とＢ補正信号生成手段とに接続され、Ｂ補正信号生成手段にて生成された補正信号に基づきＢ入力端子から入力されるＢ（青）信号の補正を行うＢ補正手段を備える補正手段と、
前記Ｒ入力端子に接続されたＲ（赤）信号を出力するＲ出力端子と、
前記Ｇ入力端子に接続されたＧ（緑）信号を出力するＧ出力端子と、
前記Ｂ補正手段に接続されたＢ（青）信号を出力するＢ出力端子と、
を備えた画像信号補正手段の動作方法であって、
当該検出手段が、所望する条件である、
入力されるＲ（赤）信号がＲ基準信号生成手段で生成される基準信号の値より小さく、且つ、
入力されるＧ（緑）信号がＧ基準信号生成手段で生成される基準信号の値より大きく、且つ、
入力されるＢ（青）信号がＢ基準信号生成手段で生成される基準信号の値より小さいことを検出し、その検出結果を補正信号生成手段に出力するステップと、
当該補正信号生成手段のＢ補正信号生成手段が、前記検出手段の所望する条件が満たされた情報である検出結果に基づき、検出手段からの所望する条件が満たされない場合には補正信号は生成せず、検出手段からの所望する条件が満たされた場合には補正信号を生成し、且つ、入力されるＧ（緑）信号の値とＢ（青）信号の値とに応じて一意に値が決定される、つまりＧ（緑）信号の値とＢ（青）信号の値との大小に関連して補正信号の値の大小が決定される補正信号を生成するステップと、
当該補正手段のＢ補正手段が、前記Ｂ補正信号生成手段にて生成された補正信号に基づき、入力されたＢ（青）信号をＢ補正信号生成手段で生成した補正信号にて補正して、その補正後のＢ（青）信号を出力するステップ、
を実行することを特徴とする画像信号補正手段の動作方法である。
この発明により、画像信号の３原色信号であるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号のそれぞれの値が、所望する条件であるとき、入力されるＧ（緑）信号の値とＢ（青）信号の値とに応じて補正量を変えて補正することができる。
つまり、「濃い緑」であるＲ（赤）信号＝０、Ｇ（緑）信号＝２５５、Ｂ（青）信号＝０を検出したとき、Ｇ（緑）信号とＢ（青）信号との値に応じた補正信号を生成してＢ（青）信号の補正を行い、少しだけ青を混ぜた色Ｒ（赤）信号＝０、Ｇ（緑）信号＝２５５、Ｂ（青）信号＝５１に補正する事もできる。 According to a third aspect of the present invention, there are provided an R input terminal, a G input terminal, and a B input terminal for inputting an image signal composed of an R (red) signal, a G (green) signal, and a B (blue) signal which are three primary color signals. ,
R reference signal generating means for generating a desired reference signal for R (red) signal, G reference signal generating means for generating a desired reference signal for G (green) signal, and desired reference for B (blue) signal B reference signal generating means for generating a signal, R comparing means connected to the R input terminal and R reference signal generating means, G comparing means connected to the G input terminal and G reference signal generating means, and B B comparison means connected to the input terminal and the B reference signal generation means, and AND means for calculating the logical product of the results of the respective comparison means,
Detection means for comparing the image signals input from the respective input terminals with the reference signals generated by the respective reference signal generation means, that is, detecting whether the input image signal satisfies a desired condition When,
B (blue) connected to the G input terminal, the B input terminal, and the detecting means, and for applying correction based on the G (green) signal, B (blue) signal and the detection result inputted from the input terminal. Correction signal generation means comprising B correction signal generation means for generating a correction signal for a signal;
B correction means connected to the B input terminal and the B correction signal generating means and for correcting the B (blue) signal input from the B input terminal based on the correction signal generated by the B correction signal generating means is provided. Correction means;
An R output terminal for outputting an R (red) signal connected to the R input terminal;
A G output terminal for outputting a G (green) signal connected to the G input terminal;
A B output terminal for outputting a B (blue) signal connected to the B correction means;
An operation method of the image signal correction means comprising:
The detection means is a desired condition.
The input R (red) signal is smaller than the value of the reference signal generated by the R reference signal generating means, and
The input G (green) signal is larger than the value of the reference signal generated by the G reference signal generating means, and
Detecting that the input B (blue) signal is smaller than the value of the reference signal generated by the B reference signal generating means, and outputting the detection result to the correction signal generating means;
The correction signal generation unit of the correction signal generation unit generates a correction signal based on a detection result that is information satisfying a condition desired by the detection unit when a desired condition from the detection unit is not satisfied. First, when a desired condition from the detection means is satisfied, a correction signal is generated, and the value is uniquely determined according to the input G (green) signal value and B (blue) signal value. Generating a correction signal that is determined, that is, the magnitude of the value of the correction signal is determined in relation to the magnitude of the value of the G (green) signal and the value of the B (blue) signal;
The B correction means of the correction means corrects the input B (blue) signal with the correction signal generated by the B correction signal generation means based on the correction signal generated by the B correction signal generation means, Outputting the corrected B (blue) signal;
Is an operation method of the image signal correcting means.
According to the present invention, an input G (green) signal when the respective values of the R (red) signal, G (green) signal, and B (blue) signal, which are the three primary color signals of the image signal, satisfy the desired conditions. Can be corrected by changing the correction amount according to the value of B and the value of the B (blue) signal.
That is, when R (red) signal = 0, G (green) signal = 255, and B (blue) signal = 0 that are “dark green” are detected, the values of the G (green) signal and the B (blue) signal are detected. A correction signal corresponding to the signal is generated and the B (blue) signal is corrected so that the color R (red) signal = 0, G (green) signal = 255, and B (blue) signal = 51 mixed with a little blue. It can also be corrected.

請求項４に記載の発明は、３原色信号であるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号からなる画像信号を入力するＲ入力端子、Ｇ入力端子、Ｂ入力端子と、
Ｂ（青）信号用の所望する基準信号を生成するＢ基準信号生成手段と、前記Ｂ入力端子とＢ基準信号生成手段とに接続された比較手段と、を備え、
Ｂ入力端子から入力されたＢ（青）信号と、Ｂ基準信号生成手段にて生成された基準信号とを比較し、入力されたＢ（青）信号が所望する条件を満たすかを検出する検出手段と、
前記Ｒ入力端子とＧ入力端子とＢ入力端子と検出手段とに接続され、その入力端子から入力されるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号からＹ（輝度）信号に変換する変換手段と、その変換手段により変換したＹ（輝度）信号とＢ（青）信号と前記検出手段の検出結果とに基づき補正をかけるための、Ｂ（青）信号用の補正信号を生成するＢ補正信号生成手段と、を備える補正信号生成手段と、
前記Ｂ補正信号生成手段とＢ入力端子とに接続され、Ｂ補正信号生成手段にて生成された補正信号に基づきＢ入力端子から入力されるＢ（青）信号の補正を行うＢ補正手段を備える補正手段と、
Ｒ入力端子に接続されたＲ（赤）信号を出力するＲ出力端子と、
Ｇ入力端子に接続されたＧ（緑）信号を出力するＧ出力端子と、
Ｂ補正手段に接続されたＢ（青）信号を出力するＢ出力端子と、
を備えた画像信号補正手段の動作方法であって、
当該検出手段が、所望する条件である入力されるＢ（青）信号がＢ基準信号生成手段で生成される基準信号の値より小さいことを検出し、その検出結果を補正信号生成手段のＢ補正信号生成手段に出力するステップと、
当該補正信号生成手段の変換手段が、入力端子から入力されるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号をＹ（輝度）信号に変換し、その変換したＹ（輝度）信号を出力するステップと、
当該補正信号生成手段のＢ補正信号生成手段が、前記検出手段のＢ比較手段からの所望する条件が満たされた情報である検出結果に基づき、入力される画像信号のＢ（青）信号がＢ（青）信号用の基準信号より大きい場合には補正信号は生成せず、入力される画像信号のＢ（青）信号がＢ（青）信号用の基準信号より小さい場合に補正信号を生成し、且つ、入力される画像信号のＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号から変換して得られたＹ（輝度）信号の値とＢ（青）信号の値とに応じて一意に値が決定される、つまりＹ（輝度）信号の値とＢ（青）信号の値との大小に関連して補正信号の値の大小が決定される補正信号を生成するステップと、
当該補正手段のＢ補正手段が、前記Ｂ補正信号生成手段にて生成された補正信号に基づき、入力されたＢ（青）信号を前記Ｂ補正信号生成手段が生成した補正信号にて補正して、その補正後のＢ（青）信号を出力するステップ、
を実行することを特徴とする画像信号補正手段の動作方法である。
この発明により、Ｂ（青）信号が所望する基準信号値以下を検出したとき、Ｒ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号から変換したＹ（輝度）信号の値とＢ（青）信号の値とに応じた値の補正を行う事ができる。 According to a fourth aspect of the present invention, there are provided an R input terminal, an G input terminal, and a B input terminal for inputting an image signal composed of an R (red) signal, a G (green) signal, and a B (blue) signal which are three primary color signals ,
B reference signal generating means for generating a desired reference signal for the B (blue) signal, and comparison means connected to the B input terminal and the B reference signal generating means,
Detection that detects whether the input B (blue) signal satisfies a desired condition by comparing the B (blue) signal input from the B input terminal with the reference signal generated by the B reference signal generation means Means,
An R (red) signal, a G (green) signal, and a B (blue) signal to a Y (luminance) signal connected to the R input terminal, the G input terminal, the B input terminal, and the detection means. A correction signal for the B (blue) signal for applying a correction based on the Y (luminance) signal, the B (blue) signal converted by the conversion means, and the detection result of the detection means. A correction signal generating means comprising: a B correction signal generating means for generating;
B correction means connected to the B correction signal generating means and the B input terminal, for correcting a B (blue) signal input from the B input terminal based on the correction signal generated by the B correction signal generating means. Correction means;
An R output terminal for outputting an R (red) signal connected to the R input terminal;
A G output terminal for outputting a G (green) signal connected to the G input terminal;
A B output terminal for outputting a B (blue) signal connected to the B correction means;
An operation method of the image signal correction means comprising:
The detection means detects that the input B (blue) signal, which is a desired condition, is smaller than the value of the reference signal generated by the B reference signal generation means, and the detection result is B corrected by the correction signal generation means. Outputting to the signal generating means;
The conversion means of the correction signal generation means converts the R (red) signal, G (green) signal, and B (blue) signal input from the input terminal into a Y (luminance) signal, and the converted Y (luminance) Outputting a signal;
The B correction signal generating means of the correction signal generating means is configured to detect that the B (blue) signal of the input image signal is B based on a detection result that is information satisfying a desired condition from the B comparing means of the detecting means. If the reference signal for (blue) signal is larger than the reference signal, no correction signal is generated. If the B (blue) signal of the input image signal is smaller than the reference signal for B (blue) signal, the correction signal is generated. In addition, the value of the Y (luminance) signal and the value of the B (blue) signal obtained by converting the R (red) signal, G (green) signal, and B (blue) signal of the input image signal Generating a correction signal whose value is uniquely determined in response, that is, the magnitude of the value of the correction signal is determined in relation to the magnitude of the value of the Y (luminance) signal and the value of the B (blue) signal; ,
The B correction unit of the correction unit corrects the input B (blue) signal with the correction signal generated by the B correction signal generation unit based on the correction signal generated by the B correction signal generation unit. , Outputting the corrected B (blue) signal;
Is an operation method of the image signal correcting means.
According to the present invention, when the B (blue) signal is detected below the desired reference signal value, the value of the Y (luminance) signal converted from the R (red) signal, the G (green) signal, and the B (blue) signal and the B The value can be corrected according to the value of the (blue) signal.

本発明は、画像信号の３原色信号であるＲ（赤）、Ｇ（緑）信号、Ｂ（青）信号のそれぞれの値が所望の条件を満たすかを検出する検出手段と、その検出手段の検出結果と前記入力の画像信号の値に応じて補正をかけるための補正信号を生成する補正信号生成手段と、その補正信号生成手段の補正信号に基づき前記入力の画像信号に補正を加え出力する補正手段と、を備えた画像信号の信号補正手段の動作方法であるため、
画像信号の３原色信号であるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号のそれぞれの値が、所望する条件であるとき、Ｒ（赤）信号の値とＧ（緑）信号の値とに応じた補正信号を生成してＧ（緑）信号の補正を行う事や、Ｒ（赤）信号の値とＢ（青）信号の値とに応じた補正信号を生成してＢ（青）信号の補正を行う事ができる。従って、「濃い赤」であるＲ（赤）信号＝２５５、Ｇ（緑）信号＝０、Ｂ（青）信号＝０を検出して、少しだけ白を混ぜた「明るい赤」Ｒ（赤）信号＝２５５、Ｇ（緑）信号＝５１、Ｂ（青）号＝５１や、短波長（オレンジ）寄りの「朱色」Ｒ（赤）信号＝２５５、Ｇ（緑）信号＝５１、Ｂ（青）信号＝０に補正することができる。
さらにＧ（緑）信号が所望する基準信号値以下を検出したとき、Ｒ（赤）信号の値とＧ（緑）信号の値とに応じた補正信号を生成してＧ（緑）信号の補正を行う事や、Ｂ（青）信号が所望する基準信号値以下を検出したとき、Ｒ（赤）信号とＢ（青）信号の値との値に応じた補正信号を生成してＢ（青）信号の補正を行う事もできる。
さらにＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号がそれぞれ所望する基準値との比較により、例えば「濃い緑」であるＲ（赤）信号＝０、Ｇ（緑）信号＝２５５、Ｂ（青）信号＝０を検出したとき、Ｇ（緑）信号とＢ（青）信号との値に応じた補正信号を生成してＢ（青）信号の補正を行い、少しだけ青を混ぜた色Ｒ（赤）信号＝０、Ｇ（緑）信号＝２５５、Ｂ（青）信号＝５１に補正する事もできる。
さらにＢ（青）信号が所望する基準信号値以下を検出したときの、Ｒ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号から変換したＹ（輝度）信号の値に応じたＢ（青）信号の補正を行う事もできる。 The present invention provides a detection means for detecting whether each value of R (red), G (green) signal, and B (blue) signal, which are three primary color signals of an image signal, satisfies a desired condition, A correction signal generating means for generating a correction signal for performing correction according to the detection result and the value of the input image signal, and correcting and outputting the input image signal based on the correction signal of the correction signal generating means Since the operation method of the signal correction means of the image signal comprising the correction means,
When the values of the R (red) signal, G (green) signal, and B (blue) signal, which are the three primary color signals of the image signal, satisfy the desired conditions, the value of the R (red) signal and G (green) A correction signal corresponding to the signal value is generated to correct the G (green) signal, or a correction signal corresponding to the R (red) signal value and the B (blue) signal value is generated. The B (blue) signal can be corrected. Therefore, “dark red” R (red) signal = 255, G (green) signal = 0, B (blue) signal = 0 are detected, and “bright red” R (red) mixed with a little white Signal = 255, G (green) signal = 51, B (blue) No. 51, “red” R (red) signal = 255, G (green) signal = 51, B (blue) near the short wavelength (orange) ) Signal = 0 can be corrected.
Further, when the G (green) signal is detected below the desired reference signal value, a correction signal corresponding to the R (red) signal value and the G (green) signal value is generated to correct the G (green) signal. Or when a B (blue) signal is detected to be equal to or less than a desired reference signal value, a correction signal corresponding to the value of the R (red) signal and the B (blue) signal is generated and B (blue) ) Signal correction can also be performed.
Further, the R (red) signal, G (green) signal, and B (blue) signal are compared with the desired reference values, for example, R (red) signal = 0, G (green) signal = “dark green”, for example. 255, when the B (blue) signal = 0 is detected, a correction signal corresponding to the values of the G (green) signal and the B (blue) signal is generated, and the B (blue) signal is corrected. The color R (red) signal = 0, G (green) signal = 255, and B (blue) signal = 51 can be corrected.
Furthermore, when the B (blue) signal is detected below the desired reference signal value, B corresponding to the value of the Y (luminance) signal converted from the R (red) signal, G (green) signal, and B (blue) signal The (blue) signal can also be corrected.

３原色の入力信号であるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号からなる画像信号が、所望する条件に合致するかを検出し、その検出結果に基づき補正信号を生成し、その前記補正信号に基づき前記入力の画像信号に補正を加え出力することで実現した。   Detects whether the image signal consisting of the R (red), G (green), and B (blue) signals, which are the three primary color input signals, meets the desired conditions, and generates a correction signal based on the detection result Then, it is realized by correcting the input image signal based on the correction signal and outputting it.

以下に、本発明の実施の形態例を詳細に説明する。しかし、この実施の形態例によって、この発明が限定されるものではない。先ず、最初に図面について簡単に説明を行う。
図１は、本発明に係る実施の形態例の画像信号補正手段１０の構成を説明するブロック図である。
図２は、本発明に係る実施の形態例の画像信号補正手段１０Ｂの構成を説明するブロック図である。
図３は、本発明に係る実施の形態例の画像信号補正手段１０Ｃの構成を説明するブロック図である。
図４は、本発明に係る実施の形態例の画像信号補正手段１０Ｄの構成を説明するブロック図である。
図５は、本発明に係る実施例１と実施例２の補正前の入力信号に対する補正後の出力信号の関係を表す一例の図である。
図６は、本発明に係る実施例２の補正前の入力信号に対する補正後の出力信号の関係を表す図５以外の一例の図である。
図７は、本発明に係る実施例３の補正前の入力信号に対する補正後の出力信号の関係を表す一例の図である。 Hereinafter, embodiments of the present invention will be described in detail. However, the present invention is not limited to the embodiments. First, the drawings will be briefly described first.
FIG. 1 is a block diagram illustrating a configuration of an image signal correcting unit 10 according to an embodiment of the present invention.
FIG. 2 is a block diagram illustrating the configuration of the image signal correcting unit 10B according to the embodiment of the present invention.
FIG. 3 is a block diagram illustrating a configuration of the image signal correcting unit 10C according to the embodiment of the present invention.
FIG. 4 is a block diagram illustrating the configuration of the image signal correcting unit 10D according to the embodiment of the present invention.
FIG. 5 is a diagram illustrating an example of a relationship between a corrected output signal and an input signal before correction according to the first and second embodiments of the present invention.
FIG. 6 is a diagram of an example other than FIG. 5 illustrating the relationship between the input signal before correction and the output signal after correction according to the second embodiment of the present invention.
FIG. 7 is a diagram illustrating an example of a relationship between an input signal before correction and an output signal after correction according to the third embodiment of the present invention.

先ず図１を参照して、画像信号補正手段１０を例に説明を行う。
画像信号補正手段１０は、
画像信号の赤色成分であるＲ（赤）信号が入力される入力端子２０と、
画像信号の緑色成分であるＧ（緑）信号が入力される入力端子３０と、
画像信号の青色成分であるＢ（青）信号が入力される入力端子４０と、
その入力端子２０、３０、４０と後段の補正信号生成手段６０と補正手段７０とに接続された検出手段５０と、
入力端子２０、３０、４０と検出手段５０と後段の補正手段７０とに接続された補正信号生成手段６０と、
前記入力端子３０、４０と検出手段５０と補正信号生成手段６０と出力端子９０、１００とに接続された補正手段７０と、
前記入力端子２０に接続された出力端子８０と、前記補正手段７０に接続された出力端子９０、１００とが備えられている。 First, the image signal correcting means 10 will be described as an example with reference to FIG.
The image signal correction means 10
An input terminal 20 to which an R (red) signal that is a red component of the image signal is input;
An input terminal 30 to which a G (green) signal that is a green component of the image signal is input;
An input terminal 40 to which a B (blue) signal that is a blue component of the image signal is input;
Detection means 50 connected to the input terminals 20, 30, 40, the correction signal generation means 60 and the correction means 70 in the subsequent stage,
A correction signal generation means 60 connected to the input terminals 20, 30, 40, the detection means 50, and the subsequent correction means 70;
Correction means 70 connected to the input terminals 30, 40, the detection means 50, the correction signal generation means 60, and the output terminals 90, 100;
An output terminal 80 connected to the input terminal 20 and output terminals 90 and 100 connected to the correction means 70 are provided.

検出手段５０は、Ｒ基準信号生成手段５１と、Ｇ基準信号生成手段５２と、Ｂ基準信号生成手段５３と、
入力端子２０とＲ基準信号生成手段５１と後段の論理積手段５７とに接続された比較手段５４と、
入力端子３０とＧ基準信号生成手段５２と後段の論理積手段５７とに接続された比較手段５５と、
入力端子４０とＢ基準信号生成手段５３と後段の論理積手段５７とに接続された比較手段５６と、
前記それぞれの比較手段５４、５５、５６と後段の補正信号生成手段６０と補正手段７０とに接続された論理積手段５７とを、備える。
比較手段５４は、入力端子２０から入力されたＲ（赤）信号とＲ基準信号生成手段５１にて生成されたＲ用の基準信号とを比較し、その比較結果、つまり所望する条件である入力端子２０からのＲ（赤）信号がＲ用の基準信号値以上である検出結果を論理積手段５７に出力し、
比較手段５５は、入力端子３０から入力されたＧ（緑）信号とＧ基準信号生成手段５２にて生成されたＧ用の基準信号とを比較し、その比較結果、つまり所望する条件である入力端子３０からのＧ（緑）信号がＧ用の基準信号値以下である検出結果を論理積手段５７に出力し、
比較手段５６は、入力端子４０から入力されたＢ（青）信号とＢ基準信号生成手段５３にて生成されたＢ用の基準信号とを比較し、その比較結果、つまり所望する条件である入力端子４０からのＢ（青）信号がＢ用の基準信号値以下である検出結果を論理積手段５７に出力し、
論理積手段５７は、前記それぞれの比較手段５４、５５、５６からの結果を論理積（ＡＮＤ）の演算を行い、その演算結果を補正信号生成手段６０と補正手段７０とに出力する。 The detection means 50 includes an R reference signal generation means 51, a G reference signal generation means 52, a B reference signal generation means 53,
A comparison unit 54 connected to the input terminal 20, the R reference signal generation unit 51, and the subsequent AND unit 57;
A comparison unit 55 connected to the input terminal 30, the G reference signal generation unit 52, and the subsequent AND unit 57;
A comparison unit 56 connected to the input terminal 40, the B reference signal generation unit 53, and a subsequent AND unit 57;
The comparison means 54, 55, 56, the subsequent correction signal generation means 60, and the AND means 57 connected to the correction means 70 are provided.
The comparison means 54 compares the R (red) signal input from the input terminal 20 with the R reference signal generated by the R reference signal generation means 51, and the comparison result, that is, an input that is a desired condition. The detection result that the R (red) signal from the terminal 20 is equal to or greater than the reference signal value for R is output to the AND means 57;
The comparison unit 55 compares the G (green) signal input from the input terminal 30 with the G reference signal generated by the G reference signal generation unit 52, and the comparison result, that is, an input that is a desired condition. The detection result that the G (green) signal from the terminal 30 is equal to or less than the reference signal value for G is output to the AND means 57,
The comparison means 56 compares the B (blue) signal input from the input terminal 40 with the B reference signal generated by the B reference signal generation means 53, and the comparison result, that is, the input that is the desired condition The detection result that the B (blue) signal from the terminal 40 is equal to or less than the reference signal value for B is output to the AND means 57,
The logical product means 57 performs a logical product (AND) operation on the results from the comparison means 54, 55 and 56, and outputs the operation result to the correction signal generation means 60 and the correction means 70.

補正信号生成手段６０は、
前記入力端子２０と入力端子３０と検出手段５０の論理積手段５７と後段の補正手段７０のＧ補正手段７１とに接続されたＧ補正信号生成手段６１と、
前記入力端子２０と入力端子４０と検出手段５０の論理積手段５７と後段の補正手段７０のＢ補正手段７２とに接続されたＢ補正信号生成手段６２とを備え、
Ｇ補正信号生成手段６１が、入力端子２０から入力されるＲ（赤）信号と入力端子３０から入力されるＧ（緑）信号と論理積手段５７からの検出結果とに基づき、補正信号を生成してＧ補正手段７１に出力し、
Ｂ補正信号生成手段６２が、入力端子２０から入力されるＲ（赤）信号と入力端子４０から入力されるＢ（青）信号と論理積手段５７からの検出結果とに基づき、補正信号を生成してＢ補正手段７２に出力する。 The correction signal generation means 60
A G correction signal generating means 61 connected to the input terminal 20, the input terminal 30, a logical product means 57 of the detecting means 50, and a G correcting means 71 of the correcting means 70 in the subsequent stage;
A B correction signal generation means 62 connected to the input terminal 20, the input terminal 40, a logical product means 57 of the detection means 50, and a B correction means 72 of the subsequent correction means 70;
The G correction signal generating means 61 generates a correction signal based on the R (red) signal input from the input terminal 20, the G (green) signal input from the input terminal 30, and the detection result from the logical product means 57. And output to the G correction means 71,
The B correction signal generation unit 62 generates a correction signal based on the R (red) signal input from the input terminal 20, the B (blue) signal input from the input terminal 40, and the detection result from the logical product unit 57. And output to the B correction means 72.

補正手段７０は、
入力端子３０と検出手段５０の論理積手段５７と補正信号生成手段６０のＧ補正信号生成手段６１と出力端子９０とに接続されたＧ補正手段７１と、
入力端子４０と検出手段５０の論理積手段５７と補正信号生成手段６０のＢ補正信号生成手段６２と出力端子１００とに接続されたＢ補正手段７２とを備え、
Ｇ補正手段７１は、入力端子３０からのＧ（緑）信号に、論理積手段５７からの検出結果の信号とＧ補正信号生成手段６１からの補正信号とに基づき補正を行い補正後の信号を出力端子９０に出力し、
Ｂ補正手段７２は、入力端子４０からのＢ（青）信号に、論理積手段５７からの検出結果の信号とＢ補正信号生成手段６２からの補正信号とに基づき補正を行い補正後の信号を出力端子１００に出力する。 The correction means 70
G correction means 71 connected to the input terminal 30, the logical product means 57 of the detection means 50, the G correction signal generation means 61 of the correction signal generation means 60, and the output terminal 90;
An input terminal 40, a logical product means 57 of the detection means 50, a B correction signal generation means 62 of the correction signal generation means 60, and a B correction means 72 connected to the output terminal 100;
The G correction unit 71 corrects the G (green) signal from the input terminal 30 based on the detection result signal from the logical product unit 57 and the correction signal from the G correction signal generation unit 61 to obtain a corrected signal. Output to output terminal 90,
The B correction unit 72 corrects the B (blue) signal from the input terminal 40 based on the detection result signal from the logical product unit 57 and the correction signal from the B correction signal generation unit 62 and outputs a corrected signal. Output to the output terminal 100.

上記のように構成された画像信号補正手段１０に、「濃い赤」であるＲ（赤）信号＝２５５、Ｇ（緑）信号＝０、Ｂ（青）信号＝０が入力された際に、Ｒ（赤）信号はそのままで、Ｇ（緑）信号＝５１、Ｂ（青）信号＝５１に補正する場合を、図１を参照して説明を行う。
又、Ｒ基準信号生成手段５１は２３０の基準信号を生成し、Ｇ基準信号生成手段５２とＢ基準信号生成手段５３とは１０２の基準信号を生成する例とする。
従って、
比較手段５４は、入力端子２０から入力されたＲ（赤）信号とＲ基準信号生成手段５１にて生成された基準信号とを比較し、その比較結果、つまり所望する条件である入力端子２０からのＲ（赤）信号が２３０以上の値である検出結果を論理積手段５７に出力し、
比較手段５５は、入力端子３０から入力されたＧ（緑）信号とＧ基準信号生成手段５２にて生成された基準信号とを比較し、その比較結果、つまり所望する条件である入力端子３０からのＧ（緑）信号が１０２以下の値である検出結果を論理積手段５７に出力し、
比較手段５６は、入力端子４０から入力されたＢ（青）信号とＢ基準信号生成手段５３にて生成された基準信号とを比較し、その比較結果、つまり所望する条件である入力端子４０からのＢ（青）信号が１０２以下の値である検出結果を論理積手段５７に出力する。
さらにＧ補正信号生成手段６１は、Ｒ（赤）信号とＧ（緑）信号の値に応じた補正信号を生成し、Ｂ補正信号生成手段６２は、Ｒ（赤）信号とＢ（青）信号との値に応じた補正信号を生成する。 When R (red) signal = 255, G (green) signal = 0, and B (blue) signal = 0, which are “dark red”, are input to the image signal correcting means 10 configured as described above. The case of correcting to G (green) signal = 51 and B (blue) signal = 51 without changing the R (red) signal will be described with reference to FIG.
The R reference signal generation means 51 generates 230 reference signals, and the G reference signal generation means 52 and the B reference signal generation means 53 generate 102 reference signals.
Therefore,
The comparison unit 54 compares the R (red) signal input from the input terminal 20 with the reference signal generated by the R reference signal generation unit 51, and compares the result, that is, from the input terminal 20 which is a desired condition. Output the detection result of the R (red) signal of 230 or more to the AND means 57,
The comparison unit 55 compares the G (green) signal input from the input terminal 30 with the reference signal generated by the G reference signal generation unit 52, and compares the comparison result, that is, from the input terminal 30 which is a desired condition. A detection result in which the G (green) signal is a value of 102 or less is output to the logical product means 57,
The comparison unit 56 compares the B (blue) signal input from the input terminal 40 with the reference signal generated by the B reference signal generation unit 53, and compares the comparison result, that is, from the input terminal 40 which is a desired condition. A detection result in which the B (blue) signal is a value of 102 or less is output to the logical product means 57.
Further, the G correction signal generating means 61 generates a correction signal according to the values of the R (red) signal and the G (green) signal, and the B correction signal generating means 62 is an R (red) signal and a B (blue) signal. A correction signal corresponding to the values is generated.

画像信号補正手段１０の入力端子２０、３０、４０には、それぞれＲ（赤）信号＝２５５、Ｇ（緑）信号＝０、Ｂ（青）信号＝０が入力される。
入力端子２０には、画像信号の赤色成分であるＲ（赤）信号が入力され、
入力端子３０には、画像信号の緑色成分であるＧ（緑）信号が入力され、
入力端子４０には、画像信号の青色成分であるＢ（青）信号が入力される。
従って、
Ｒ（赤）信号は、検出手段５０の比較手段５４と補正信号生成手段６０のＧ補正信号生成手段６１とＢ補正信号生成手段６２とに入力されと共に出力端子８０にて出力され、
Ｇ（緑）信号は、検出手段５０の比較手段５５と補正信号生成手段６０のＧ補正信号生成手段６１と補正手段７０のＧ補正手段７１とに入力され、
Ｂ（青）信号は、検出手段５０の比較手段５６と補正信号生成手段６０のＢ補正信号生成手段６２と補正手段７０のＢ補正手段７２とに入力される。 R (red) signal = 255, G (green) signal = 0, and B (blue) signal = 0 are input to the input terminals 20, 30, 40 of the image signal correcting means 10, respectively.
The input terminal 20 receives an R (red) signal that is a red component of the image signal,
The input terminal 30 receives a G (green) signal that is a green component of the image signal,
A B (blue) signal that is a blue component of the image signal is input to the input terminal 40.
Therefore,
The R (red) signal is input to the comparison unit 54 of the detection unit 50, the G correction signal generation unit 61 and the B correction signal generation unit 62 of the correction signal generation unit 60, and is output from the output terminal 80.
The G (green) signal is input to the comparison means 55 of the detection means 50, the G correction signal generation means 61 of the correction signal generation means 60, and the G correction means 71 of the correction means 70,
The B (blue) signal is input to the comparison unit 56 of the detection unit 50, the B correction signal generation unit 62 of the correction signal generation unit 60, and the B correction unit 72 of the correction unit 70.

検出手段５０には、前記入力端子２０、３０、４０からの画像３原色信号であるＲ（赤）信号とＧ（緑）信号とＢ（青）信号とが入力される。
比較手段５４は、Ｒ基準信号生成手段５１からの基準信号（２３０）と入力されたＲ（赤）信号とを比較し、Ｒ（赤）信号が基準信号である２３０より大きい場合には”Ｈ”の信号を出力し、小さい場合は”Ｌ”の信号を出力する。従って比較手段５４は、入力されているＲ（赤）信号は基準信号である２３０より大きいことを検出し”Ｈ”の信号を出力する。
比較手段５５は、Ｇ基準信号生成手段５２からの基準信号（１０２）と入力されたＧ（緑）信号とを比較し、Ｇ（緑）信号が基準信号である１０２より小さい場合には”Ｈ”の信号を出力し、大きい場合は”Ｌ”の信号を出力する。従って比較手段５５は、入力されているＧ（緑）信号は基準信号である１０２より小さいことを検出し”Ｈ”の信号を出力する。
比較手段５６は、Ｂ基準信号生成手段５３からの基準信号（１０２）と入力されたＢ（青）信号とを比較し、Ｂ（青）信号が基準信号である１０２より小さい場合には”Ｈ”の信号を出力し、大きい場合は”Ｌ”の信号を出力する。従って比較手段５６は、入力されているＢ（青）信号は基準信号である１０２より小さいことを検出し”Ｈ”の信号を出力する。
論理積手段５７は、前記それぞれの比較手段５４、５５、５６の結果が全て”Ｈ”であるため、全ての条件が満たされたことを検出しその結果を補正信号生成手段６０のＧ補正信号生成手段６１とＢ補正信号生成手段６２と補正手段７０のＧ補正手段７１とＢ補正手段７２とに出力する。 An R (red) signal, a G (green) signal, and a B (blue) signal that are image three primary color signals from the input terminals 20, 30, and 40 are input to the detection means 50.
The comparing means 54 compares the reference signal (230) from the R reference signal generating means 51 with the inputted R (red) signal. If the R (red) signal is larger than 230, which is the reference signal, “H” "" Signal is output, and if it is small, an "L" signal is output. Therefore, the comparing means 54 detects that the input R (red) signal is larger than 230, which is the reference signal, and outputs an “H” signal.
The comparison means 55 compares the reference signal (102) from the G reference signal generation means 52 with the inputted G (green) signal, and if the G (green) signal is smaller than 102 which is the reference signal, “H” "" Signal is output, and if it is larger, an "L" signal is output. Therefore, the comparing means 55 detects that the input G (green) signal is smaller than the reference signal 102 and outputs an “H” signal.
The comparison means 56 compares the reference signal (102) from the B reference signal generation means 53 with the input B (blue) signal, and if the B (blue) signal is smaller than 102, which is the reference signal, “H” "" Signal is output, and if it is larger, an "L" signal is output. Therefore, the comparing means 56 detects that the input B (blue) signal is smaller than the reference signal 102, and outputs an "H" signal.
The logical product means 57 detects that all the conditions are satisfied because the results of the respective comparison means 54, 55, 56 are all “H”, and detects the result as the G correction signal of the correction signal generation means 60 The data is output to the generating means 61, the B correction signal generating means 62, the G correcting means 71 of the correcting means 70, and the B correcting means 72.

補正信号生成手段６０のＧ補正信号生成手段６１は、前記検出手段５０の論理積手段５７からの信号が”Ｈ”である検出結果と入力されているＲ（赤）信号とＧ（緑）信号の値とに基づき、一意に値が決定される補正信号を生成し、補正手段７０のＧ補正手段７１に出力する。
尚、Ｇ補正信号生成手段６１が生成する補正信号の例として、
ＧＫ１は所望する係数であり一例として２．５、
ＧＫ２は所望する係数であり一例として５、
入力されるＲ（赤）信号をＲ、ただしＲは０〜２５５、
入力されるＧ（緑）信号をＧ、ただしＧは０〜２５５とするとき、
（Ｒ−（Ｇ×ＧＫ１））が負の値の場合では、生成される補正信号Ｇは０、
（Ｒ−（Ｇ×ＧＫ１））が正の値の場合では、
補正信号Ｇ＝（Ｒ−（Ｇ×ＧＫ１））÷ＧＫ２、
である補正信号Ｇを生成する。
補正信号生成手段６０のＢ補正信号生成手段６２は、前記検出手段５０の論理積手段５７からの信号が”Ｈ”である検出結果と入力されているＲ（赤）信号とＢ（青）信号の値とに基づき、一意に値が決定される補正信号を生成し、補正手段７０のＢ補正手段７２に出力する。
尚、Ｂ補正信号生成手段６２が生成する補正信号の例として、
ＢＫ１は所望する係数であり一例として２．５、
ＢＫ２は所望する係数であり一例として５、
入力されるＲ（赤）信号をＲ、ただしＲは０〜２５５、
入力されるＢ（青）信号をＢ、ただしＢは０〜２５５とするとき、
（Ｒ−（Ｂ×ＢＫ１））が負の値の場合では、生成される補正信号Ｂは０、
（Ｒ−（Ｂ×ＢＫ１））が正の値の場合では、
補正信号Ｂ＝（Ｒ−（Ｂ×ＢＫ１））÷ＢＫ２、
である補正信号Ｂを生成する。 The G correction signal generation means 61 of the correction signal generation means 60 receives the detection result that the signal from the logical product means 57 of the detection means 50 is “H” and the input R (red) signal and G (green) signal. A correction signal whose value is uniquely determined is generated based on the value of, and is output to the G correction unit 71 of the correction unit 70.
As an example of the correction signal generated by the G correction signal generation means 61,
GK1 is a desired coefficient, for example 2.5,
GK2 is a desired coefficient, for example 5,
R (red) signal input is R, where R is 0-255,
When the input G (green) signal is G, where G is 0 to 255,
When (R− (G × GK1)) is a negative value, the generated correction signal G is 0,
When (R− (G × GK1)) is a positive value,
Correction signal G = (R− (G × GK1)) ÷ GK2,
A correction signal G is generated.
The B correction signal generation means 62 of the correction signal generation means 60 receives the detection result that the signal from the logical product means 57 of the detection means 50 is “H” and the R (red) signal and the B (blue) signal inputted. A correction signal whose value is uniquely determined is generated based on the value of, and is output to the B correction unit 72 of the correction unit 70.
As an example of the correction signal generated by the B correction signal generation means 62,
BK1 is a desired coefficient, for example 2.5,
BK2 is a desired coefficient, for example 5,
R (red) signal input is R, where R is 0-255,
When the input B (blue) signal is B, where B is 0 to 255,
When (R− (B × BK1)) is a negative value, the generated correction signal B is 0,
When (R− (B × BK1)) is a positive value,
Correction signal B = (R− (B × BK1)) ÷ BK2,
A correction signal B is generated.

補正手段７０のＧ補正手段７１は、入力端子３０からのＧ（緑）信号に、前記検出手段５０の論理積手段５７からの検出結果の情報とＧ補正信号生成手段６１からの補正信号とに基づき補正を行い、補正後の信号を出力端子９０に出力する。
補正手段７０のＢ補正手段７２は、入力端子４０からのＢ（青）信号に、前記検出手段５０の論理積手段５７からの検出結果の情報とＢ補正信号生成手段６２からの補正信号とに基づき補正を行い、補正後の信号を出力端子１００に出力する。 The G correction means 71 of the correction means 70 converts the G (green) signal from the input terminal 30 into information on the detection result from the logical product means 57 of the detection means 50 and the correction signal from the G correction signal generation means 61. Based on the correction, the corrected signal is output to the output terminal 90.
The B correction means 72 of the correction means 70 converts the B (blue) signal from the input terminal 40 into the information of the detection result from the logical product means 57 of the detection means 50 and the correction signal from the B correction signal generation means 62. Based on the correction, the corrected signal is output to the output terminal 100.

その結果、「濃い赤」であるＲ（赤）信号＝２５５、Ｇ（緑）信号＝０、Ｂ（青）信号＝０が入力された際に、Ｒ（赤）信号＝２５５、Ｇ（緑）信号＝５１、Ｂ（青）信号＝５１に補正することができる。
尚、画像信号補正手段１０による入力Ｇ（緑）信号と出力Ｇ（緑）信号との関係、若しくは、入力Ｂ（青）信号と出力Ｂ（青）信号との関係である、補正前の入力信号と補正後の出力信号との関係を図５に示す。 As a result, when R (red) signal = 255, G (green) signal = 0, and B (blue) signal = 0 which are “dark red” are input, R (red) signal = 255, G (green) ) Signal = 51 and B (blue) signal = 51.
Note that the input before correction, which is the relationship between the input G (green) signal and the output G (green) signal by the image signal correction means 10, or the relationship between the input B (blue) signal and the output B (blue) signal. FIG. 5 shows the relationship between the signal and the corrected output signal.

次に図２を参照して、画像信号補正手段１０Ｂを例に、Ｒ（赤）信号の値に対応してＧ（緑）信号を補正する、若しくはＲ（赤）信号の値に対応してＢ（青）信号を補正する場合の説明を行う。   Next, referring to FIG. 2, the image signal correcting means 10B is taken as an example to correct the G (green) signal corresponding to the value of the R (red) signal, or to correspond to the value of the R (red) signal. The case of correcting the B (blue) signal will be described.

画像信号補正手段１０Ｂは、
画像信号の赤色成分であるＲ（赤）信号が入力される入力端子２０と、
画像信号の緑色成分であるＧ（緑）信号が入力される入力端子３０と、
画像信号の青色成分であるＢ（青）信号が入力される入力端子４０と、
その入力端子３０、４０と後段の補正信号生成手段６０Ｂとの間に介在し接続された検出手段５０Ｂと、
前記入力端子２０、３０、４０と検出手段５０Ｂと後段の補正手段７０Ｂとに接続された補正信号生成手段６０Ｂと、
前記入力端子３０、４０と補正信号生成手段６０Ｂと出力端子９０、１００とに接続された補正手段７０Ｂと、
前記入力端子２０に接続された出力端子８０と、
前記補正手段７０Ｂに接続された出力端子９０、１００とが備えられている。 The image signal correction means 10B
An input terminal 20 to which an R (red) signal that is a red component of the image signal is input;
An input terminal 30 to which a G (green) signal that is a green component of the image signal is input;
An input terminal 40 to which a B (blue) signal that is a blue component of the image signal is input;
Detection means 50B interposed between and connected to the input terminals 30 and 40 and the subsequent correction signal generation means 60B;
Correction signal generation means 60B connected to the input terminals 20, 30, 40, the detection means 50B, and the subsequent correction means 70B;
Correction means 70B connected to the input terminals 30, 40, the correction signal generation means 60B, and the output terminals 90, 100;
An output terminal 80 connected to the input terminal 20;
Output terminals 90 and 100 connected to the correcting means 70B are provided.

検出手段５０Ｂは、Ｇ基準信号生成手段５２Ｂと、Ｂ基準信号生成手段５３Ｂと、
入力端子３０とＧ基準信号生成手段５２Ｂと後段の補正信号生成手段６０ＢのＧ補正信号生成手段６１Ｂとに接続された比較手段５５と、
入力端子４０とＢ基準信号生成手段５３Ｂと後段の補正信号生成手段６０ＢのＢ補正信号生成手段６２Ｂとに接続された比較手段５６と、を備える。
比較手段５５は、入力端子３０から入力されたＧ（緑）信号とＧ基準信号生成手段５２Ｂにて生成されたＧ用の基準信号とを比較し、その比較結果、つまり所望する条件である入力端子３０からのＧ（緑）信号がＧ用の基準信号値以下の値である検出結果を補正信号生成手段６０ＢのＧ補正信号生成手段６１Ｂに出力し、
比較手段５６は、入力端子４０から入力されたＢ（青）信号とＢ基準信号生成手段５３Ｂにて生成されたＢ用の基準信号とを比較し、その比較結果、つまり所望する条件である入力端子４０からのＢ（青）信号がＢ用の基準信号値以下の値である検出結果を補正信号生成手段６０ＢのＢ補正信号生成手段６２Ｂに出力する。 The detection means 50B includes a G reference signal generation means 52B, a B reference signal generation means 53B,
A comparison unit 55 connected to the input terminal 30, the G reference signal generation unit 52B, and the G correction signal generation unit 61B of the subsequent correction signal generation unit 60B;
Comparing means 56 connected to the input terminal 40, the B reference signal generating means 53B, and the B correction signal generating means 62B of the subsequent correction signal generating means 60B.
The comparison means 55 compares the G (green) signal input from the input terminal 30 with the G reference signal generated by the G reference signal generation means 52B, and the comparison result, that is, an input that is a desired condition. A detection result in which the G (green) signal from the terminal 30 is equal to or less than the reference signal value for G is output to the G correction signal generation unit 61B of the correction signal generation unit 60B.
The comparison means 56 compares the B (blue) signal input from the input terminal 40 with the B reference signal generated by the B reference signal generation means 53B, and the comparison result, that is, an input that is a desired condition. A detection result in which the B (blue) signal from the terminal 40 is equal to or less than the reference signal value for B is output to the B correction signal generation unit 62B of the correction signal generation unit 60B.

補正信号生成手段６０Ｂは、
前記入力端子２０、３０と検出手段５０Ｂの比較手段５５と後段の補正手段７０ＢのＧ補正手段７１Ｂとに接続されたＧ補正信号生成手段６１Ｂと
前記入力端子２０、４０と検出手段５０Ｂの比較手段５６と後段の補正手段７０ＢのＢ補正手段７２Ｂとに接続されたＢ補正信号生成手段６２Ｂとを備え、
Ｇ補正信号生成手段６１Ｂは、Ｒ（赤）信号とＧ（緑）信号と検出手段５０Ｂの比較手段５５からの検出結果とに基づき補正信号を生成してＧ補正手段７１Ｂに出力し、
Ｂ補正信号生成手段６２Ｂは、Ｒ（赤）信号とＢ（青）信号と検出手段５０Ｂの比較手段５６からの検出結果とに基づき補正信号を生成してＢ補正手段７２Ｂに出力する。 The correction signal generation means 60B
G correction signal generating means 61B connected to the input terminals 20 and 30, the comparison means 55 of the detection means 50B, and the G correction means 71B of the subsequent correction means 70B, and the comparison means of the input terminals 20, 40 and the detection means 50B 56 and a B correction signal generating means 62B connected to the B correcting means 72B of the correcting means 70B at the subsequent stage,
The G correction signal generation unit 61B generates a correction signal based on the R (red) signal, the G (green) signal, and the detection result from the comparison unit 55 of the detection unit 50B, and outputs the correction signal to the G correction unit 71B.
The B correction signal generation unit 62B generates a correction signal based on the R (red) signal, the B (blue) signal, and the detection result from the comparison unit 56 of the detection unit 50B, and outputs the correction signal to the B correction unit 72B.

補正手段７０Ｂは、
入力端子３０とＧ補正信号生成手段６１Ｂと出力端子９０とに接続されたＧ補正手段７１Ｂと、
入力端子４０とＢ補正信号生成手段６２Ｂと出力端子１００とに接続されたＢ補正手段７２Ｂとを備え、
Ｇ補正手段７１Ｂは、入力端子３０からのＧ（緑）信号にＧ補正信号生成手段６１Ｂからの補正信号に基づき補正を行い補正後の信号を出力端子９０に出力し、
Ｂ補正手段７２Ｂは、入力端子４０からのＢ（青）信号にＢ補正信号生成手段６２Ｂからの補正信号に基づき補正を行い補正後の信号を出力端子１００に出力する。 The correction means 70B
G correction means 71B connected to the input terminal 30, G correction signal generation means 61B, and output terminal 90;
B correction means 72B connected to the input terminal 40, B correction signal generation means 62B, and output terminal 100,
The G correction unit 71B corrects the G (green) signal from the input terminal 30 based on the correction signal from the G correction signal generation unit 61B, and outputs the corrected signal to the output terminal 90.
The B correction unit 72B corrects the B (blue) signal from the input terminal 40 based on the correction signal from the B correction signal generation unit 62B, and outputs the corrected signal to the output terminal 100.

上記のように構成された画像信号補正手段１０Ｂに、それぞれＲ（赤）信号＝２５５、Ｇ（緑）信号＝０、Ｂ（青）信号＝０が入力された際に、Ｇ（緑）信号とＢ（青）信号とを補正する場合を、図２を参照して説明を行う。
又、Ｇ基準信号生成手段５２ＢとＢ基準信号生成手段５３Ｂとは１０２の値の基準信号を生成する例とする。
従って、比較手段５５は、入力端子３０から入力されたＧ（緑）信号とＧ基準信号生成手段５２Ｂにて生成された基準信号とを比較し、その比較結果、つまり所望する条件である入力端子３０からのＧ（緑）信号が１０２以下の値である検出結果をＧ補正信号生成手段６１Ｂに出力し、
比較手段５６は、入力端子４０から入力されたＢ（青）信号とＢ基準信号生成手段５３Ｂにて生成された基準信号とを比較し、その比較結果、つまり所望する条件である入力端子４０からのＢ（青）信号が１０２以下の値である検出結果をＢ補正信号生成手段６２Ｂに出力する。
さらにＧ補正信号生成手段６１Ｂは、Ｒ（赤）信号とＧ（緑）信号の値に応じた補正信号を生成し、Ｂ補正信号生成手段６２Ｂは、Ｒ（赤）信号とＢ（青）信号との値に応じた補正信号を生成する。 When the R (red) signal = 255, the G (green) signal = 0, and the B (blue) signal = 0 are input to the image signal correction means 10B configured as described above, the G (green) signal And B (blue) signal will be described with reference to FIG.
The G reference signal generation means 52B and the B reference signal generation means 53B are assumed to generate a reference signal having a value of 102.
Therefore, the comparing means 55 compares the G (green) signal input from the input terminal 30 with the reference signal generated by the G reference signal generating means 52B, and the comparison result, that is, the input terminal which is a desired condition. The G (green) signal from 30 is a value equal to or less than 102, and the detection result is output to the G correction signal generation means 61B.
The comparison unit 56 compares the B (blue) signal input from the input terminal 40 with the reference signal generated by the B reference signal generation unit 53B, and compares the comparison result, that is, from the input terminal 40 which is a desired condition. The detection result of the B (blue) signal having a value of 102 or less is output to the B correction signal generating means 62B.
Further, the G correction signal generating means 61B generates a correction signal according to the values of the R (red) signal and the G (green) signal, and the B correction signal generating means 62B is an R (red) signal and a B (blue) signal. A correction signal corresponding to the values is generated.

画像信号補正手段１０Ｂの入力端子２０、３０、４０には、それぞれＲ（赤）信号＝２５５、Ｇ（緑）信号＝０、Ｂ（青）信号＝０が入力される。
入力端子２０には、画像信号の赤色成分であるＲ（赤）信号が入力され、
入力端子３０には、画像信号の緑色成分であるＧ（緑）信号が入力され、
入力端子４０には、画像信号の青色成分であるＢ（青）信号が入力される。
従って
Ｒ（赤）信号は、補正信号生成手段６０ＢのＧ補正信号生成手段６１ＢとＢ補正信号生成手段６２Ｂとに入力され、さらに出力端子８０にて出力される。
Ｇ（緑）信号は、検出手段５０Ｂの比較手段５５と補正信号生成手段６０ＢのＧ補正信号生成手段６１Ｂと補正手段７０ＢのＧ補正手段７１Ｂとに入力される。
Ｂ（青）信号は、検出手段５０Ｂの比較手段５６と補正信号生成手段６０ＢのＢ補正信号生成手段６２Ｂと補正手段７０ＢのＢ補正手段７２Ｂとに入力される。 The R (red) signal = 255, the G (green) signal = 0, and the B (blue) signal = 0 are input to the input terminals 20, 30, 40 of the image signal correcting unit 10B, respectively.
The input terminal 20 receives an R (red) signal that is a red component of the image signal,
The input terminal 30 receives a G (green) signal that is a green component of the image signal,
A B (blue) signal that is a blue component of the image signal is input to the input terminal 40.
Accordingly, the R (red) signal is input to the G correction signal generation unit 61B and the B correction signal generation unit 62B of the correction signal generation unit 60B, and is further output from the output terminal 80.
The G (green) signal is input to the comparison means 55 of the detection means 50B, the G correction signal generation means 61B of the correction signal generation means 60B, and the G correction means 71B of the correction means 70B.
The B (blue) signal is input to the comparison unit 56 of the detection unit 50B, the B correction signal generation unit 62B of the correction signal generation unit 60B, and the B correction unit 72B of the correction unit 70B.

検出手段５０Ｂには、前記入力端子３０、４０からのＧ（緑）信号とＢ（青）信号が入力される。
比較手段５５は、Ｇ基準信号生成手段５２Ｂからの基準信号（１０２）と入力されたＧ（緑）信号とを比較し、Ｇ（緑）信号が基準信号である１０２より小さい場合には、”Ｈ”の信号を出力し、大きい場合は”Ｌ”の信号を出力する。
従って比較手段５５は、入力されているＧ（緑）信号が基準信号である１０２より小さいことを検出し”Ｈ”の信号を出力する。
比較手段５６は、Ｂ基準信号生成手段５３Ｂからの基準信号（１０２）と入力されたＢ（青）信号とを比較し、Ｂ（青）信号が基準信号である１０２より小さい場合には、”Ｈ”の信号を出力し、大きい場合は”Ｌ”の信号を出力する。
従って比較手段５６は、入力されているＢ（青）信号が基準信号である１０２より小さいことを検出し”Ｈ”の信号を出力する。 The G (green) signal and B (blue) signal from the input terminals 30 and 40 are input to the detection means 50B.
The comparison means 55 compares the reference signal (102) from the G reference signal generation means 52B with the input G (green) signal, and if the G (green) signal is smaller than 102 which is the reference signal, An “H” signal is output, and if large, an “L” signal is output.
Therefore, the comparing means 55 detects that the input G (green) signal is smaller than the reference signal 102 and outputs an “H” signal.
The comparison means 56 compares the reference signal (102) from the B reference signal generation means 53B with the input B (blue) signal. An “H” signal is output, and if large, an “L” signal is output.
Therefore, the comparing means 56 detects that the input B (blue) signal is smaller than the reference signal 102 and outputs an “H” signal.

補正信号生成手段６０ＢのＧ補正信号生成手段６１Ｂは、前記検出手段５０Ｂの比較手段５５からの信号が”Ｈ”である検出結果と入力されているＲ（赤）信号とＧ（緑）信号の値に基づき、一意に値が決定される補正信号を生成し、補正手段７０ＢのＧ補正手段７１Ｂに出力する。
尚、Ｇ補正信号生成手段６１Ｂが生成する補正信号の例１Ｂとして、
ＧＫ１は所望する係数であり一例として２．５、
ＧＫ２は所望する係数であり一例として５、
入力されるＲ（赤）信号をＲ、ただしＲは０〜２５５、
入力されるＧ（緑）信号をＧ、ただしＧは０〜２５５とするとき、
（Ｒ−（Ｇ×ＧＫ１））が負の値の場合では、生成される補正信号Ｇは０、
（Ｒ−（Ｇ×ＧＫ１））が正の値の場合では、
補正信号Ｇ＝（Ｒ−（Ｇ×ＧＫ１））÷ＧＫ２、
である補正信号Ｇを生成する。
この例１Ｂの補正前の信号と補正後の信号との関係の代表値例を図５に示す。 The G correction signal generation means 61B of the correction signal generation means 60B is configured to detect the R (red) signal and the G (green) signal inputted with the detection result that the signal from the comparison means 55 of the detection means 50B is “H”. Based on the value, a correction signal whose value is uniquely determined is generated and output to the G correction unit 71B of the correction unit 70B.
As an example of the correction signal 1B generated by the G correction signal generating means 61B,
GK1 is a desired coefficient, for example 2.5,
GK2 is a desired coefficient, for example 5,
R (red) signal input is R, where R is 0-255,
When the input G (green) signal is G, where G is 0 to 255,
When (R− (G × GK1)) is a negative value, the generated correction signal G is 0,
When (R− (G × GK1)) is a positive value,
Correction signal G = (R− (G × GK1)) ÷ GK2,
A correction signal G is generated.
FIG. 5 shows a representative value example of the relationship between the signal before correction and the signal after correction in Example 1B.

補正信号生成手段６０ＢのＢ補正信号生成手段６２Ｂは、前記検出手段５０の比較手段５６からの信号が”Ｈ”である検出結果と入力されているＲ（赤）信号とＢ（青）信号の値に基づき、一意に値が決定される補正信号を生成し、補正手段７０ＢのＢ補正手段７２Ｂに出力する。
尚、Ｂ補正信号生成手段６２Ｂが生成する補正信号の例２Ｂとして、
ＢＫ１は所望する係数であり一例として２．５、
ＢＫ２は所望する係数であり一例として５、
入力されるＲ（赤）信号をＲ、ただしＲは０〜２５５、
入力されるＢ（青）信号をＢ、ただしＢは０〜２５５とするとき、
（Ｒ−（Ｂ×ＢＫ１））が負の値の場合では、生成される補正信号Ｂは０、
（Ｒ−（Ｂ×ＢＫ１））が正の値の場合では、
補正信号Ｂ＝（Ｒ−（Ｂ×ＢＫ１））÷ＢＫ２、
である補正信号Ｂを生成する。
この例２Ｂの補正前の信号と補正後の信号との関係の代表値例を図５に示す。 The B correction signal generation means 62B of the correction signal generation means 60B is configured to detect the R (red) signal and the B (blue) signal that are input with the detection result that the signal from the comparison means 56 of the detection means 50 is “H”. Based on the value, a correction signal whose value is uniquely determined is generated and output to the B correction unit 72B of the correction unit 70B.
As an example 2B of the correction signal generated by the B correction signal generation means 62B,
BK1 is a desired coefficient, for example 2.5,
BK2 is a desired coefficient, for example 5,
R (red) signal input is R, where R is 0-255,
When the input B (blue) signal is B, where B is 0 to 255,
When (R− (B × BK1)) is a negative value, the generated correction signal B is 0,
When (R− (B × BK1)) is a positive value,
Correction signal B = (R− (B × BK1)) ÷ BK2,
A correction signal B is generated.
FIG. 5 shows a representative value example of the relationship between the signal before correction and the signal after correction in Example 2B.

補正手段７０ＢのＧ補正手段７１Ｂは、入力端子３０からのＧ（緑）信号に、Ｇ補正信号生成手段６１Ｂからの補正信号に基づき補正を行い出力端子９０に出力する。
補正手段７０ＢのＢ補正手段７２Ｂは、入力端子４０からのＢ（青）信号に、Ｂ補正信号生成手段６２Ｂからの補正信号に基づき補正を行い出力端子１００に出力する。 The G correction means 71B of the correction means 70B corrects the G (green) signal from the input terminal 30 based on the correction signal from the G correction signal generation means 61B, and outputs it to the output terminal 90.
The B correction means 72B of the correction means 70B corrects the B (blue) signal from the input terminal 40 based on the correction signal from the B correction signal generation means 62B, and outputs it to the output terminal 100.

その結果、Ｒ（赤）信号＝２５５、Ｇ（緑）信号＝０、Ｂ（青）信号＝０が入力された際に、Ｒ（赤）信号＝２５５、Ｇ（緑）信号＝５１、Ｂ（青）信号＝５１に補正することができる。
従って、図５のごとくＲ（赤）信号の値に対応したＧ（緑）信号、若しくはＢ（青）信号に補正することができる。
さらに又、補正信号の値を決める別な例３Ｂとして、
比較手段の結果とは無関係に、入力されるＲ（赤）信号と入力されるＢ（青）信号とに基づき、
logは、１０を低とする対数とし、
入力されるＲ（赤）信号をＲ、ただしＲは０〜１００、
入力されるＢ（青）信号をＢ、ただしＢは０〜１００とするとき、
（１−log（（Ｂ＋１０）÷１０））が負の値の場合では、生成される補正信号Ｂは０、
（１−log（（Ｂ＋１０）÷１０））が正の値の場合では、
補正信号Ｂ＝（２０×（Ｒ÷１００））×（１−log（（Ｂ＋１０）÷１０））、
である補正信号Ｂを生成する。
従って、入力されているＲ（赤）信号とＢ（青）信号の値に基づき、一意に値が決定される補正信号を生成できる。 As a result, when R (red) signal = 255, G (green) signal = 0, and B (blue) signal = 0, R (red) signal = 255, G (green) signal = 51, B (Blue) signal = 51 can be corrected.
Therefore, it can be corrected to a G (green) signal or a B (blue) signal corresponding to the value of the R (red) signal as shown in FIG.
Furthermore, as another example 3B for determining the value of the correction signal,
Regardless of the result of the comparison means, based on the input R (red) signal and the input B (blue) signal,
log is the logarithm with 10 being low,
The input R (red) signal is R, where R is 0 to 100,
When the input B (blue) signal is B, where B is 0-100,
When (1-log ((B + 10) ÷ 10)) is a negative value, the generated correction signal B is 0,
When (1-log ((B + 10) ÷ 10)) is a positive value,
Correction signal B = (20 × (R ÷ 100)) × (1−log ((B + 10) ÷ 10)),
A correction signal B is generated.
Accordingly, it is possible to generate a correction signal whose value is uniquely determined based on the values of the input R (red) signal and B (blue) signal.

この例３Ｂの補正前の信号と補正後の信号との関係の代表値例を図６に示し、さらに入力されているＲ（赤）信号とＢ（青）信号の値に基づき生成される補正信号の代表値例を表１に示す。

Figure 0004139433
A representative value example of the relationship between the signal before correction and the signal after correction in this example 3B is shown in FIG. Table 1 shows an example of representative values of signals.
Figure 0004139433

尚、上記例はＢ補正信号生成手段６２Ｂの例であるが、Ｇ補正信号生成手段６１Ｂも同様である。   The above example is an example of the B correction signal generation unit 62B, but the same applies to the G correction signal generation unit 61B.

次に図３を参照して、画像信号補正手段１０Ｃを例に説明を行う。
画像信号補正手段１０Ｃは、
画像信号の赤色成分であるＲ（赤）信号が入力される入力端子２０と、
画像信号の緑色成分であるＧ（緑）信号が入力される入力端子３０と、
画像信号の青色成分であるＢ（青）信号が入力される入力端子４０と、
その入力端子２０、３０、４０と後段の補正信号生成手段６０Ｃとに接続された検出手段５０Ｃと、
前記入力端子３０、４０と検出手段５０Ｃと後段の補正手段７０Ｃとの間に介在し接続された補正信号生成手段６０Ｃと、
前記入力端子４０と補正信号生成手段６０Ｃと出力端子１００とに接続された補正手段７０Ｃと、
前記入力端子２０に接続された出力端子８０と、
前記入力端子３０に接続された出力端子９０と、
前記補正手段７０Ｃに接続された出力端子１００とが備えられている。 Next, the image signal correcting unit 10C will be described as an example with reference to FIG.
The image signal correcting means 10C
An input terminal 20 to which an R (red) signal that is a red component of the image signal is input;
An input terminal 30 to which a G (green) signal that is a green component of the image signal is input;
An input terminal 40 to which a B (blue) signal that is a blue component of the image signal is input;
A detection means 50C connected to the input terminals 20, 30, 40 and the subsequent correction signal generation means 60C;
Correction signal generation means 60C interposed between and connected to the input terminals 30, 40, the detection means 50C, and the subsequent correction means 70C;
Correction means 70C connected to the input terminal 40, the correction signal generation means 60C, and the output terminal 100;
An output terminal 80 connected to the input terminal 20;
An output terminal 90 connected to the input terminal 30;
And an output terminal 100 connected to the correcting means 70C.

検出手段５０Ｃは、Ｒ基準信号生成手段５１Ｃと、Ｇ基準信号生成手段５２Ｃと、Ｂ基準信号生成手段５３Ｃと、
入力端子２０とＲ基準信号生成手段５１Ｃと後段の論理積手段５７Ｃとに接続された比較手段５４と、
入力端子３０とＧ基準信号生成手段５２Ｃと後段の論理積手段５７Ｃとに接続された比較手段５５と、
入力端子４０とＢ基準信号生成手段５３Ｃと後段の論理積手段５７Ｃとに接続された比較手段５６と、
前記それぞれの比較手段５４、５５、５６と後段の補正信号生成手段６０Ｃとに接続された論理積手段５７Ｃとを、備える。
比較手段５４は、入力端子２０から入力されたＲ（赤）信号とＲ基準信号生成手段５１Ｃにて生成されたＲ用の基準信号とを比較し、その比較結果、つまり所望する条件である入力端子２０からのＲ（赤）信号がＲ用の基準信号値以下である検出結果を論理積手段５７Ｃに出力し、
比較手段５５は、入力端子３０から入力されたＧ（緑）信号とＧ基準信号生成手段５２Ｃにて生成されたＧ用の基準信号とを比較し、その比較結果、つまり所望する条件である入力端子３０からのＧ（緑）信号がＧ用の基準信号値以上である検出結果を論理積手段５７Ｃに出力し、
比較手段５６は、入力端子４０から入力されたＢ（青）信号とＢ基準信号生成手段５３Ｃにて生成されたＢ用の基準信号とを比較し、その比較結果、つまり所望する条件である入力端子４０からのＢ（青）信号がＢ用の基準信号値以下である検出結果を論理積手段５７Ｃに出力し、
論理積手段５７Ｃは、前記それぞれの比較手段５４、５５、５６の結果を論理積（ＡＮＤ）の演算を行い、その演算結果を補正信号生成手段６０Ｃに出力する。 The detection means 50C includes an R reference signal generation means 51C, a G reference signal generation means 52C, a B reference signal generation means 53C,
A comparison unit 54 connected to the input terminal 20, the R reference signal generation unit 51C, and the subsequent AND unit 57C;
A comparison unit 55 connected to the input terminal 30, the G reference signal generation unit 52C, and the subsequent AND unit 57C;
A comparison unit 56 connected to the input terminal 40, the B reference signal generation unit 53C, and the subsequent AND unit 57C;
And a logical product means 57C connected to the respective comparison means 54, 55, 56 and the subsequent correction signal generation means 60C.
The comparison means 54 compares the R (red) signal input from the input terminal 20 with the R reference signal generated by the R reference signal generation means 51C, and the comparison result, that is, an input that is a desired condition. The detection result that the R (red) signal from the terminal 20 is equal to or less than the reference signal value for R is output to the AND means 57C.
The comparison unit 55 compares the G (green) signal input from the input terminal 30 with the G reference signal generated by the G reference signal generation unit 52C, and the comparison result, that is, an input that is a desired condition. The detection result that the G (green) signal from the terminal 30 is equal to or greater than the reference signal value for G is output to the AND means 57C.
The comparison unit 56 compares the B (blue) signal input from the input terminal 40 with the B reference signal generated by the B reference signal generation unit 53C, and the comparison result, that is, an input that is a desired condition. The detection result that the B (blue) signal from the terminal 40 is equal to or less than the reference signal value for B is output to the AND means 57C.
The logical product means 57C performs a logical product (AND) operation on the results of the comparison means 54, 55 and 56, and outputs the operation result to the correction signal generation means 60C.

補正信号生成手段６０Ｃは、
前記入力端子３０、４０と検出手段５０Ｃの論理積手段５７Ｃと後段の補正手段７０ＣのＢ補正手段７２Ｃとに接続されたＢ補正信号生成手段６２Ｃを備え、
入力されるＧ（緑）信号とＢ（青）信号と検出手段５０Ｃの論理積手段５７Ｃからの検出結果とに基づき、Ｂ補正信号生成手段６２Ｃが補正信号を生成して補正手段７０ＣのＢ補正手段７２Ｃに出力する。 The correction signal generation means 60C
B correction signal generation means 62C connected to the input terminals 30 and 40, the AND means 57C of the detection means 50C and the B correction means 72C of the subsequent correction means 70C,
Based on the input G (green) signal and B (blue) signal and the detection result from the logical product means 57C of the detection means 50C, the B correction signal generation means 62C generates a correction signal and the B correction of the correction means 70C. Output to means 72C.

補正手段７０Ｃは、
入力端子４０と補正信号生成手段６０ＣのＢ補正信号生成手段６２Ｃと出力端子１００とに接続されたＢ補正手段７２Ｃを備え、
Ｂ補正手段７２Ｃは、入力端子４０からのＢ（青）信号に、Ｂ補正信号生成手段６２Ｃからの補正信号に基づき補正を行い補正後の信号を出力端子１００に出力する。 The correcting means 70C
B correction means 72C connected to the input terminal 40, the B correction signal generation means 62C of the correction signal generation means 60C and the output terminal 100,
The B correction unit 72C corrects the B (blue) signal from the input terminal 40 based on the correction signal from the B correction signal generation unit 62C, and outputs the corrected signal to the output terminal 100.

上記のように構成された画像信号補正手段１０Ｃに、「濃い緑」であるＲ（赤）信号＝０、Ｇ（緑）信号＝２５５、Ｂ（青）信号＝０が入力された際に、少しだけ青を混ぜた色Ｒ（赤）信号＝０、Ｇ（緑）信号＝２５５、Ｂ（青）信号＝５１に補正する場合の説明を行う。
尚、Ｒ基準信号生成手段５１Ｃは５１の値の基準信号を生成し、Ｇ基準信号生成手段５２Ｃは２３０の値の基準信号を生成し、Ｂ基準信号生成手段５３Ｃは１０２の値の基準信号を生成する例とする。
従って、比較手段５４は、入力端子２０から入力されたＲ（赤）信号とＲ基準信号生成手段５１Ｃにて生成された基準信号とを比較し、その比較結果、つまり所望する条件である入力端子２０からのＲ（赤）信号が５１以下の値である検出結果を論理積手段５７Ｃに出力し、
比較手段５５は、入力端子３０から入力されたＧ（緑）信号とＧ基準信号生成手段５２Ｃにて生成された基準信号とを比較し、その比較結果、つまり所望する条件である入力端子３０からのＧ（緑）信号が２３０以上の値である検出結果を論理積手段５７Ｃに出力し、
比較手段５６は、入力端子４０から入力されたＢ（青）信号とＢ基準信号生成手段５３Ｃにて生成された基準信号とを比較し、その比較結果、つまり所望する条件である入力端子４０からのＢ（青）信号が１０２以下の値である検出結果を論理積手段５７Ｃに出力する。
さらに、Ｂ補正信号生成手段６２Ｃは入力されたＧ（緑）信号とＢ（青）信号との値に応じた補正信号を生成するものとする。 When R (red) signal = 0, G (green) signal = 255, and B (blue) signal = 0, which are “dark green”, are input to the image signal correcting unit 10C configured as described above. A description will be given of a case where correction is made so that the color R (red) signal = 0, G (green) signal = 255, and B (blue) signal = 51 mixed with a little blue.
The R reference signal generating means 51C generates a reference signal having a value of 51, the G reference signal generating means 52C generates a reference signal having a value of 230, and the B reference signal generating means 53C generates a reference signal having a value of 102. An example of generation.
Therefore, the comparison means 54 compares the R (red) signal input from the input terminal 20 with the reference signal generated by the R reference signal generation means 51C, and the comparison result, that is, the input terminal which is the desired condition. A detection result in which the R (red) signal from 20 is a value of 51 or less is output to the AND means 57C.
The comparison unit 55 compares the G (green) signal input from the input terminal 30 with the reference signal generated by the G reference signal generation unit 52C, and compares the comparison result, that is, from the input terminal 30 which is a desired condition. The detection result of the G (green) signal of 230 or more is output to the AND means 57C,
The comparison means 56 compares the B (blue) signal input from the input terminal 40 with the reference signal generated by the B reference signal generation means 53C, and the comparison result, that is, from the input terminal 40 which is a desired condition. The detection result in which the B (blue) signal is a value of 102 or less is output to the AND means 57C.
Further, it is assumed that the B correction signal generation unit 62C generates a correction signal corresponding to the values of the input G (green) signal and B (blue) signal.

画像信号補正手段１０Ｃの入力端子２０、３０、４０には、それぞれＲ（赤）信号＝０、Ｇ（緑）信号＝２５５、Ｂ（青）信号＝０が入力される。
入力端子２０には、画像信号の赤色成分であるＲ（赤）信号が入力され、
入力端子３０には、画像信号の緑色成分であるＧ（緑）信号が入力され、
入力端子４０には、画像信号の青色成分であるＢ（青）信号が入力される。
従って、
Ｒ（赤）信号は、検出手段５０Ｃの比較手段５４に入力されると共に出力端子８０にて出力され、
Ｇ（緑）信号は、検出手段５０Ｃの比較手段５５と補正信号生成手段６０ＣのＢ補正信号生成手段６２Ｃに入力されると共に出力端子９０にて出力され、
Ｂ（青）信号は、検出手段５０Ｃの比較手段５６と補正信号生成手段６０ＣのＢ補正信号生成手段６２Ｃと補正手段７０ＣのＢ補正手段７２Ｃとに入力される。 R (red) signal = 0, G (green) signal = 255, and B (blue) signal = 0 are input to the input terminals 20, 30, 40 of the image signal correcting means 10C, respectively.
The input terminal 20 receives an R (red) signal that is a red component of the image signal,
The input terminal 30 receives a G (green) signal that is a green component of the image signal,
A B (blue) signal that is a blue component of the image signal is input to the input terminal 40.
Therefore,
The R (red) signal is input to the comparison unit 54 of the detection unit 50C and output from the output terminal 80.
The G (green) signal is input to the comparison unit 55 of the detection unit 50C and the B correction signal generation unit 62C of the correction signal generation unit 60C and is output from the output terminal 90.
The B (blue) signal is input to the comparison unit 56 of the detection unit 50C, the B correction signal generation unit 62C of the correction signal generation unit 60C, and the B correction unit 72C of the correction unit 70C.

検出手段５０Ｃには、前記入力端子２０、３０、４０からの画像３原色信号であるＲ（赤）信号とＧ（緑）信号とＢ（青）信号とが入力される。
比較手段５４は、Ｒ基準信号生成手段５１Ｃからの基準信号（５１）と入力されたＲ（赤）信号とを比較し、Ｒ（赤）信号が基準信号である５１より小さい場合には、”Ｈ”の信号を出力し、大きい場合は”Ｌ”の信号を出力する。
従って比較手段５４は、入力されているＲ（赤）信号は基準信号である５１より小さいことを検出し”Ｈ”の信号を出力する。
比較手段５５は、Ｇ基準信号生成手段５２Ｃからの基準信号（２３０）と入力されたＧ（緑）信号とを比較し、Ｇ（緑）信号が基準信号である２３０より大きい場合には、”Ｈ”の信号を出力し、小さい場合は”Ｌ”の信号を出力する。
従って比較手段５５は、入力されているＧ（緑）信号は基準信号である２３０より大きいことを検出し”Ｈ”の信号を出力する。
比較手段５６は、Ｂ基準信号生成手段５３Ｃからの基準信号（１０２）と入力されたＢ（青）信号とを比較し、Ｂ（青）信号が基準信号である１０２より小さい場合には、”Ｈ”の信号を出力し、大きい場合は”Ｌ”の信号を出力する。
従って比較手段５６は、入力されているＢ（青）信号は基準信号である１０２より小さいことを検出し”Ｈ”の信号を出力する。
論理積手段５７Ｃは、前記それぞれの比較手段５４、５５、５６の結果が全て”Ｈ”であるため、全ての条件が満たされたことを検出しその結果を補正信号生成手段６０ＣのＢ補正信号生成手段６２Ｃに出力する。 An R (red) signal, a G (green) signal, and a B (blue) signal, which are image three primary color signals, are input from the input terminals 20, 30, and 40 to the detection unit 50C.
The comparing means 54 compares the reference signal (51) from the R reference signal generating means 51C with the inputted R (red) signal, and when the R (red) signal is smaller than 51 which is the reference signal, An “H” signal is output, and if large, an “L” signal is output.
Therefore, the comparison means 54 detects that the inputted R (red) signal is smaller than the reference signal 51 and outputs an “H” signal.
The comparison means 55 compares the reference signal (230) from the G reference signal generation means 52C with the inputted G (green) signal, and when the G (green) signal is larger than 230, which is the reference signal, “ An “H” signal is output. If the signal is small, an “L” signal is output.
Therefore, the comparing means 55 detects that the input G (green) signal is larger than 230 which is the reference signal, and outputs an “H” signal.
The comparison means 56 compares the reference signal (102) from the B reference signal generation means 53C with the input B (blue) signal, and when the B (blue) signal is smaller than 102, which is the reference signal, An “H” signal is output, and if large, an “L” signal is output.
Therefore, the comparing means 56 detects that the input B (blue) signal is smaller than the reference signal 102, and outputs an "H" signal.
The logical product means 57C detects that all the conditions are satisfied because the results of the respective comparison means 54, 55 and 56 are all "H", and detects the result as the B correction signal of the correction signal generation means 60C. Output to the generating means 62C.

補正信号生成手段６０ＣのＢ補正信号生成手段６２Ｃは、検出手段５０Ｃの論理積手段５７Ｃからの信号が”Ｈ”である検出結果と入力されるＧ（緑）信号とＢ（青）信号との値に応じ一意に値が決定される補正信号を生成し、補正手段７０ＣのＢ補正手段７２Ｃに出力する。
尚、Ｂ補正信号生成手段６２Ｃが生成する補正信号の一例として、
ＢＫ１は所望する係数であり一例として２．５、
ＢＫ２は所望する係数であり一例として５、
入力されるＧ（緑）信号をＧ、ただしＧは０〜２５５
入力されるＢ（青）信号をＢ、ただしＢは０〜２５５とするとき、
（Ｇ−（Ｂ×ＢＫ１））が負の値の場合では、生成される補正信号Ｂは０、
（Ｇ−（Ｂ×ＢＫ１））が正の値の場合では、
補正信号Ｂ＝（Ｇ−（Ｂ×ＢＫ１））÷ＢＫ２、
である補正信号Ｂを生成する。
この例の補正前の信号と補正後の信号との関係の代表値例を図７に示す。 The B correction signal generation unit 62C of the correction signal generation unit 60C is configured to detect the detection result that the signal from the logical product unit 57C of the detection unit 50C is “H” and the input G (green) signal and B (blue) signal. A correction signal whose value is uniquely determined according to the value is generated and output to the B correction unit 72C of the correction unit 70C.
As an example of the correction signal generated by the B correction signal generation means 62C,
BK1 is a desired coefficient, for example 2.5,
BK2 is a desired coefficient, for example 5,
The input G (green) signal is G, where G is 0 to 255
When the input B (blue) signal is B, where B is 0 to 255,
When (G− (B × BK1)) is a negative value, the generated correction signal B is 0,
When (G− (B × BK1)) is a positive value,
Correction signal B = (G− (B × BK1)) ÷ BK2,
A correction signal B is generated.
FIG. 7 shows a representative value example of the relationship between the signal before correction and the signal after correction in this example.

補正手段７０ＣのＢ補正手段７２Ｃは、入力端子４０からのＢ（青）信号に、前記Ｂ補正信号生成手段６２Ｃからの補正信号に基づき補正を行い出力端子１００に出力する。   The B correction means 72C of the correction means 70C corrects the B (blue) signal from the input terminal 40 based on the correction signal from the B correction signal generation means 62C, and outputs it to the output terminal 100.

その結果、「濃い緑」であるＲ（赤）信号＝０、Ｇ（緑）信号＝２５５、Ｂ（青）信号＝０を検出して、少しだけ青を混ぜた色Ｒ（赤）信号＝０、Ｇ（緑）信号＝２５５、Ｂ（青）信号＝５１に補正することができる。   As a result, R (red) signal = 0, G (green) signal = 255, and B (blue) signal = 0, which are “dark green”, are detected, and a color R (red) signal in which a little blue is mixed = It can be corrected to 0, G (green) signal = 255, and B (blue) signal = 51.

次に図４を参照して画像信号補正手段１０Ｄを例に、入力されたＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号をＹ（輝度）信号に変換し、そのＹ（輝度）信号の値に応じて、Ｂ（青）信号を補正する場合の説明を行う。   Next, referring to FIG. 4, taking the image signal correction means 10D as an example, the input R (red) signal, G (green) signal, and B (blue) signal are converted into Y (luminance) signals, and the Y ( The case of correcting the B (blue) signal according to the value of the (luminance) signal will be described.

画像信号補正手段１０Ｄは、
画像信号の赤色成分であるＲ（赤）信号が入力される入力端子２０と、
画像信号の緑色成分であるＧ（緑）信号が入力される入力端子３０と、
画像信号の青色成分であるＢ（青）信号が入力される入力端子４０と、
その入力端子４０と後段の補正信号生成手段６０Ｄとの間に介在し接続された検出手段５０Ｄと、
前記入力端子２０、３０、４０と検出手段５０Ｄと後段の補正手段７０Ｄとに接続された補正信号生成手段６０Ｄと、
前記入力端子４０と補正信号生成手段６０Ｄと後段の出力端子１００とに接続された補正手段７０Ｄと、
前記入力端子２０に接続された出力端子８０と、前記入力端子３０に接続された出力端子９０と、
前記補正手段７０Ｄに接続された出力端子１００とが備えられている。 Image signal correcting means 10D
An input terminal 20 to which an R (red) signal that is a red component of the image signal is input;
An input terminal 30 to which a G (green) signal that is a green component of the image signal is input;
An input terminal 40 to which a B (blue) signal that is a blue component of the image signal is input;
Detection means 50D interposed and connected between the input terminal 40 and the correction signal generation means 60D at the subsequent stage;
A correction signal generating means 60D connected to the input terminals 20, 30, 40, the detecting means 50D, and the correcting means 70D at the subsequent stage;
Correction means 70D connected to the input terminal 40, the correction signal generation means 60D, and the output terminal 100 in the subsequent stage;
An output terminal 80 connected to the input terminal 20, an output terminal 90 connected to the input terminal 30, and
And an output terminal 100 connected to the correcting means 70D.

検出手段５０Ｄは、Ｂ基準信号生成手段５３Ｄと、
入力端子４０とＢ基準信号生成手段５３Ｄと後段の補正信号生成手段６０Ｄとに接続された比較手段５６と、を備える。
比較手段５６は、入力端子４０から入力されたＢ（青）信号とＢ基準信号生成手段５３Ｄにて生成された基準信号とを比較し、その比較結果、つまり所望する条件である入力端子４０からのＢ（青）信号がＢ用基準信号値以下の値である検出結果を補正信号生成手段６０Ｄに出力する。 The detection unit 50D includes a B reference signal generation unit 53D,
Comparing means 56 connected to the input terminal 40, the B reference signal generating means 53D, and the subsequent correction signal generating means 60D.
The comparison means 56 compares the B (blue) signal input from the input terminal 40 with the reference signal generated by the B reference signal generation means 53D, and the comparison result, that is, from the input terminal 40 which is a desired condition. A detection result in which the B (blue) signal is equal to or less than the reference signal value for B is output to the correction signal generating means 60D.

補正信号生成手段６０Ｄは、入力端子２０、３０、４０と後段のＢ補正信号生成手段６２Ｄとに接続され、入力されたＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号をＹ（輝度）信号に変換する変換手段６３Ｄと、その変換手段６３Ｄと入力端子４０と検出手段５０Ｄの比較手段５６と後段の補正手段７０ＤのＢ補正手段７２Ｄとに接続されたＢ補正信号生成手段６２Ｄと、を備える。
Ｂ補正信号生成手段６２Ｄは、検出手段５０Ｄの比較手段５６からの検出結果と変換手段６３ＤからのＹ（輝度）信号と入力端子４０から入力されたＢ（青）信号とに基づき、補正信号を生成して補正手段７０ＤのＢ補正手段７２Ｄに出力する。 The correction signal generation means 60D is connected to the input terminals 20, 30, 40 and the B correction signal generation means 62D at the subsequent stage, and the input R (red) signal, G (green) signal, and B (blue) signal are converted to Y. A conversion means 63D for converting into a (luminance) signal, a B correction signal generation means 62D connected to the conversion means 63D, the input terminal 40, the comparison means 56 of the detection means 50D, and the B correction means 72D of the subsequent correction means 70D. And comprising.
The B correction signal generation unit 62D generates a correction signal based on the detection result from the comparison unit 56 of the detection unit 50D, the Y (luminance) signal from the conversion unit 63D, and the B (blue) signal input from the input terminal 40. Generated and output to the B correction means 72D of the correction means 70D.

補正手段７０Ｄは、前記入力端子４０と補正信号生成手段６０ＤのＢ補正信号生成手段６２Ｄと出力端子１００とに接続されたＢ補正手段７２Ｄを備え、
Ｂ補正手段７２Ｄは、入力端子４０からのＢ（青）信号に、補正信号生成手段６０ＤのＢ補正信号生成手段６２Ｄからの補正信号に基づき補正を行い補正後の信号を出力端子１００に出力する。 The correction unit 70D includes a B correction unit 72D connected to the input terminal 40, the B correction signal generation unit 62D of the correction signal generation unit 60D, and the output terminal 100,
The B correction unit 72D corrects the B (blue) signal from the input terminal 40 based on the correction signal from the B correction signal generation unit 62D of the correction signal generation unit 60D, and outputs the corrected signal to the output terminal 100. .

出力端子８０は、前記入力端子２０に接続され、入力端子２０からの信号を出力する。
出力端子９０は、前記入力端子３０に接続され、入力端子３０からの信号を出力する。 The output terminal 80 is connected to the input terminal 20 and outputs a signal from the input terminal 20.
The output terminal 90 is connected to the input terminal 30 and outputs a signal from the input terminal 30.

出力端子１００は、前記補正手段７０ＤのＢ補正手段７２Ｄに接続され補正後の信号を出力する。   The output terminal 100 is connected to the B correction unit 72D of the correction unit 70D and outputs a corrected signal.

上記のように構成された画像信号補正手段１０Ｄに、それぞれＲ（赤）信号＝１２８（５０％）、Ｇ（緑）信号＝１２８（５０％）、Ｂ（青）信号＝２６（１０％）が入力された際に、Ｂ（青）信号を補正する場合を、図４を参照して説明を行う。
又、Ｂ基準信号生成手段５３Ｄは１０２（４０％）の値の基準信号を生成する例とする。
従って、比較手段５６は、入力端子４０から入力されたＢ（青）信号とＢ基準信号生成手段５３Ｄにて生成された基準信号とを比較し、その比較結果、つまり所望する条件である入力端子４０からのＢ（青）信号が１０２（４０％）以下の値である検出結果を、補正信号生成手段６０ＤのＢ補正信号生成手段６２Ｄに出力する。
さらにＢ補正信号生成手段６２Ｄは、Ｙ（輝度）信号とＢ（青）信号の値に応じて一意に値が決定される補正信号を生成する。 In the image signal correcting means 10D configured as described above, R (red) signal = 128 (50%), G (green) signal = 128 (50%), B (blue) signal = 26 (10%), respectively. The case where the B (blue) signal is corrected when is input will be described with reference to FIG.
The B reference signal generating means 53D generates a reference signal having a value of 102 (40%).
Therefore, the comparison unit 56 compares the B (blue) signal input from the input terminal 40 with the reference signal generated by the B reference signal generation unit 53D, and the comparison result, that is, the input terminal which is a desired condition. A detection result in which the B (blue) signal from 40 is a value of 102 (40%) or less is output to the B correction signal generation means 62D of the correction signal generation means 60D.
Further, the B correction signal generation means 62D generates a correction signal whose value is uniquely determined according to the values of the Y (luminance) signal and the B (blue) signal.

画像信号補正手段１０Ｄに、それぞれＲ（赤）信号＝１２８（５０％）、Ｇ（緑）信号＝１２８（５０％）、Ｂ（青）信号＝２６（１０％）が入力される。
入力端子２０には、画像信号の赤色成分であるＲ（赤）信号が入力され、
入力端子３０には、画像信号の緑色成分であるＧ（緑）信号が入力され、
入力端子４０には、画像信号の青色成分であるＢ（青）信号が入力される。
Ｒ（赤）信号は、補正信号生成手段６０Ｄの変換手段６３Ｄに入力されると共に出力端子８０にて出力される。
Ｇ（緑）信号は、補正信号生成手段６０Ｄの変換手段６３Ｄに入力されると共に出力端子９０にて出力される。
Ｂ（青）信号は、検出手段５０Ｄの比較手段５６と補正信号生成手段６０ＤのＢ補正信号生成手段６２Ｄと変換手段６３Ｄと補正手段７０ＤのＢ補正手段７２Ｄとに入力される。 R (red) signal = 128 (50%), G (green) signal = 128 (50%), and B (blue) signal = 26 (10%) are input to the image signal correcting means 10D, respectively.
The input terminal 20 receives an R (red) signal that is a red component of the image signal,
The input terminal 30 receives a G (green) signal that is a green component of the image signal,
A B (blue) signal that is a blue component of the image signal is input to the input terminal 40.
The R (red) signal is input to the conversion unit 63D of the correction signal generation unit 60D and output from the output terminal 80.
The G (green) signal is input to the conversion unit 63D of the correction signal generation unit 60D and output from the output terminal 90.
The B (blue) signal is input to the comparison unit 56 of the detection unit 50D, the B correction signal generation unit 62D of the correction signal generation unit 60D, the conversion unit 63D, and the B correction unit 72D of the correction unit 70D.

検出手段５０Ｄの比較手段５６は、Ｂ基準信号生成手段５３Ｄからの基準信号（１０２）と入力されたＢ（青）信号とを比較し、Ｂ（青）信号が基準信号である１０２より小さい場合には、”Ｈ”の信号を出力し、大きい場合は”Ｌ”の信号を出力する。
従って比較手段５６は、入力されているＢ（青）信号が基準信号である１０２より小さいことを検出し”Ｈ”の信号を出力する。 The comparison unit 56 of the detection unit 50D compares the reference signal (102) from the B reference signal generation unit 53D with the input B (blue) signal, and the B (blue) signal is smaller than 102 which is the reference signal. In this case, an “H” signal is output, and if it is larger, an “L” signal is output.
Therefore, the comparing means 56 detects that the input B (blue) signal is smaller than the reference signal 102 and outputs an “H” signal.

補正信号生成手段６０Ｄの変換手段６３Ｄは、入力端子２０、３０、４０からのＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号をＹ（輝度）信号に変換し、Ｂ補正信号生成手段６２Ｄに出力する。
尚、８bit量子化にて表したＲＧＢ信号を、ＹＣｂＣｒ信号に変換する変換式の一例としてＩＴＵ−Ｒ ＢＴ．６０１に規定されている、色変換式のＹ信号に関する式を例として次に示す。
入力されるＲ（赤）信号をＲ、ただしＲは０〜２５５、
入力されるＧ（緑）信号をＧ、ただしＧは０〜２５５、
入力されるＢ（青）信号をＢ、ただしＢは０〜２５５とするとき、
Ｙ＝（７７×Ｒ／２５６）＋（１５０×Ｇ／２５６）＋（２９×Ｂ／２５６）
従って、Ｒ（赤）信号＝１２８、Ｇ（緑）信号＝１２８、Ｂ（青）信号＝２６が入力された際のＹ（輝度）信号の値は、約１１６である。 The conversion means 63D of the correction signal generation means 60D converts the R (red) signal, G (green) signal, and B (blue) signal from the input terminals 20, 30, and 40 into Y (luminance) signals, and the B correction signal. Output to the generating means 62D.
As an example of a conversion formula for converting an RGB signal represented by 8-bit quantization into a YCbCr signal, ITU-R BT. An example of the color conversion formula Y signal defined in 601 is shown below.
R (red) signal input is R, where R is 0-255,
The input G (green) signal is G, where G is 0 to 255,
When the input B (blue) signal is B, where B is 0 to 255,
Y = (77 × R / 256) + (150 × G / 256) + (29 × B / 256)
Accordingly, when the R (red) signal = 128, the G (green) signal = 128, and the B (blue) signal = 26 are input, the value of the Y (luminance) signal is about 116.

補正信号生成手段６０ＤのＢ補正信号生成手段６２Ｄは、前記検出手段５０Ｄの比較手段５６からの信号（”Ｈ”）と変換手段６３ＤからのＹ（輝度）信号と入力端子４０からのＢ（青）信号とに基づき、変換手段６３ＤからのＹ（輝度）信号と入力端子４０からのＢ（青）信号との値に応じて一意に値が決定される補正信号を生成し補正手段７２Ｄへ出力する。
尚、Ｂ補正信号生成手段６２Ｄが生成する補正信号の一例として、
ＢＫ１は所望する係数であり一例として２．５、
ＢＫ２は所望する係数であり一例として５、
入力端子２０、３０、４０からのＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号をＹ（輝度）信号に変換したＹ（輝度）信号をＹ、ただしＹは０〜２５５、
入力されるＢ（青）信号をＢとするとき、
（Ｙ−（Ｂ×ＢＫ１））が負の値の場合では、生成される補正信号Ｂは０、
（Ｙ−（Ｂ×ＢＫ１））が正の値の場合では、生成される補正信号Ｂは、
補正信号Ｂ＝（Ｙ―（Ｂ×ＢＫ１））÷ＢＫ２、
である補正信号を生成する。
従って、補正信号Ｂ＝（（１１６−（２６×２．５））÷５）＝約１０の補正信号を生成する。 The B correction signal generation means 62D of the correction signal generation means 60D includes a signal ("H") from the comparison means 56 of the detection means 50D, a Y (luminance) signal from the conversion means 63D, and B (blue) from the input terminal 40. ) Signal is generated based on the value of the Y (luminance) signal from the conversion means 63D and the value of the B (blue) signal from the input terminal 40, and is output to the correction means 72D. To do.
As an example of the correction signal generated by the B correction signal generation means 62D,
BK1 is a desired coefficient, for example 2.5,
BK2 is a desired coefficient, for example 5,
Y (luminance) signal obtained by converting the R (red) signal, G (green) signal, and B (blue) signal from the input terminals 20, 30, and 40 into Y (luminance) signal, where Y is 0 to 255,
When the input B (blue) signal is B,
When (Y− (B × BK1)) is a negative value, the generated correction signal B is 0,
When (Y− (B × BK1)) is a positive value, the generated correction signal B is
Correction signal B = (Y− (B × BK1)) ÷ BK2,
A correction signal is generated.
Therefore, the correction signal B = ((116− (26 × 2.5)) ÷ 5) = about 10 correction signals are generated.

補正手段７０Ｄの補正手段７２Ｄは、入力端子４０からのＢ（青）信号に、Ｂ補正信号生成手段６２Ｄからの補正信号に基づき補正を行い出力端子１００へ出力する。   The correction means 72D of the correction means 70D corrects the B (blue) signal from the input terminal 40 based on the correction signal from the B correction signal generation means 62D, and outputs it to the output terminal 100.

その結果、Ｒ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号を変換したＹ（輝度）信号の値とＢ（青）信号との値とに応じた補正信号で、Ｂ（青）信号が１０２以上の場合には補正を行わず、Ｂ（青）信号が１０２未満の低い場合にはＢ（青）信号を補正することができる。   As a result, a correction signal corresponding to the value of the Y (luminance) signal obtained by converting the R (red) signal, the G (green) signal, and the B (blue) signal and the value of the B (blue) signal, ) If the signal is 102 or higher, no correction is performed, and if the B (blue) signal is lower than 102, the B (blue) signal can be corrected.

この一例の入力信号であるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号と変換したＹ（輝度）信号と補正信号との代表値を表２から表１２に示す。
表２は、Ｒ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号が、０から２５５まで１０％刻みで増加した場合の、Ｙ（輝度）信号と補正信号との値である。

Figure 0004139433
Tables 2 to 12 show typical values of the R (red) signal, the G (green) signal, the B (blue) signal, the converted Y (luminance) signal, and the correction signal, which are input signals of this example.
Table 2 shows values of the Y (luminance) signal and the correction signal when the R (red) signal, the G (green) signal, and the B (blue) signal increase from 0 to 255 in increments of 10%.
Figure 0004139433

表３は、Ｒ（赤）信号＝約２６（１０％）、Ｇ（緑）信号＝約２６（１０％）で、Ｂ（青）信号が、０から約１０２（４０％）まで１０％刻みで増加した場合の、Ｙ（輝度）信号と補正信号との値である。

Figure 0004139433
Table 3 shows that R (red) signal = about 26 (10%), G (green) signal = about 26 (10%), and B (blue) signal from 0 to about 102 (40%) in increments of 10%. This is the value of the Y (luminance) signal and the correction signal when increased by.
Figure 0004139433

表４は、Ｒ（赤）信号＝約５１（２０％）、Ｇ（緑）信号＝約５１（２０％）で、Ｂ（青）信号が、０から約１０２（４０％）まで１０％刻みで増加した場合の、Ｙ（輝度）信号と補正信号との値である。

Figure 0004139433
Table 4 shows that R (red) signal = about 51 (20%), G (green) signal = about 51 (20%), and B (blue) signal from 0 to about 102 (40%) in 10% increments. This is the value of the Y (luminance) signal and the correction signal when increased by.
Figure 0004139433

表５は、Ｒ（赤）信号＝約７７（３０％）、Ｇ（緑）信号＝約７７（３０％）で、Ｂ（青）信号が、０から約１０２（４０％）まで１０％刻みで増加した場合の、Ｙ（輝度）信号と補正信号との値である。

Figure 0004139433
Table 5 shows that R (red) signal = about 77 (30%), G (green) signal = about 77 (30%), and B (blue) signal from 0 to about 102 (40%) in 10% increments. This is the value of the Y (luminance) signal and the correction signal when increased by.
Figure 0004139433

表６は、Ｒ（赤）信号＝約１０２（４０％）、Ｇ（緑）信号＝約１０２（４０％）で、Ｂ（青）信号が、０から約１０２（４０％）まで１０％刻みで増加した場合の、Ｙ（輝度）信号と補正信号との値である。

Figure 0004139433
Table 6 shows that R (red) signal = about 102 (40%), G (green) signal = about 102 (40%), and B (blue) signal from 0 to about 102 (40%) in increments of 10%. This is the value of the Y (luminance) signal and the correction signal when increased by.
Figure 0004139433

表７は、Ｒ（赤）信号＝約１２８（５０％）、Ｇ（緑）信号＝約１２８（５０％）で、Ｂ（青）信号が、０から約１０２（４０％）まで１０％刻みで増加した場合の、Ｙ（輝度）信号と補正信号との値である。

Figure 0004139433
Table 7 shows that R (red) signal = about 128 (50%), G (green) signal = about 128 (50%), and B (blue) signal from 0 to about 102 (40%) in steps of 10%. This is the value of the Y (luminance) signal and the correction signal when increased by.
Figure 0004139433

表８は、Ｒ（赤）信号＝約１５３（６０％）、Ｇ（緑）信号＝約１５３（６０％）で、Ｂ（青）信号が、０から約１０２（４０％）まで１０％刻みで増加した場合の、Ｙ（輝度）信号と補正信号との値である。

Figure 0004139433
Table 8 shows that R (red) signal = about 153 (60%), G (green) signal = about 153 (60%), and B (blue) signal from 0 to about 102 (40%) in increments of 10%. This is the value of the Y (luminance) signal and the correction signal when increased by.
Figure 0004139433

表９は、Ｒ（赤）信号＝約１７９（７０％）、Ｇ（緑）信号＝約１７９（７０％）で、Ｂ（青）信号が、０から約１０２（４０％）まで１０％刻みで増加した場合の、Ｙ（輝度）信号と補正信号との値である。

Figure 0004139433
Table 9 shows that R (red) signal = about 179 (70%), G (green) signal = about 179 (70%), and B (blue) signal from 0 to about 102 (40%) in increments of 10%. This is the value of the Y (luminance) signal and the correction signal when increased by.
Figure 0004139433

表１０は、Ｒ（赤）信号＝約２０４（８０％）、Ｇ（緑）信号＝約２０４（８０％）で、Ｂ（青）信号が、０から約１０２（４０％）まで１０％刻みで増加した場合の、Ｙ（輝度）信号と補正信号との値である。

Figure 0004139433
Table 10 shows that R (red) signal = about 204 (80%), G (green) signal = about 204 (80%), and B (blue) signal from 0 to about 102 (40%) in 10% increments. This is the value of the Y (luminance) signal and the correction signal when increased by.
Figure 0004139433

表１１は、Ｒ（赤）信号＝約２３０（９０％）、Ｇ（緑）信号＝約２３０（９０％）で、Ｂ（青）信号が、０から約１０２（４０％）まで１０％刻みで増加した場合の、Ｙ（輝度）信号と補正信号との値である。

Figure 0004139433
Table 11 shows that R (red) signal = about 230 (90%), G (green) signal = about 230 (90%), and B (blue) signal from 0 to about 102 (40%) in increments of 10%. This is the value of the Y (luminance) signal and the correction signal when increased by.
Figure 0004139433

表１２は、Ｒ（赤）信号＝約２５５（１００％）、Ｇ（緑）信号＝約２５５（１００％）で、Ｂ（青）信号が、０から約１０２（４０％）まで１０％刻みで増加した場合の、Ｙ（輝度）信号と補正信号との値である。

Figure 0004139433
Table 12 shows that R (red) signal = about 255 (100%), G (green) signal = about 255 (100%), and B (blue) signal from 0 to about 102 (40%) in increments of 10%. This is the value of the Y (luminance) signal and the correction signal when increased by.
Figure 0004139433

尚、入力３原色信号を表す量子化ｂｉｔ数は、８ｂｉｔ以外の所望のｂｉｔ数であること、若しくは８ｂｉｔ以外の所望のｂｉｔ数であり、且つ負を表すことが可能なサインビットを備える量子化方法であっても同様な効果が得られる。   Note that the number of quantization bits representing the input three primary color signals is a desired number of bits other than 8 bits, or a desired number of bits other than 8 bits, and a quantization including a sign bit that can represent negative. Even if it is a method, the same effect is acquired.

さらに、実施例で説明に使用したＢＫ１とＢＫ２とＧＫ１とＧＫ２等の係数は、他の所望する値であっても効果が得られる。   Furthermore, even if the coefficients such as BK1, BK2, GK1, and GK2 used for the explanation in the embodiment are other desired values, the effect can be obtained.

補正信号生成手段は、ルックアップテーブル方式であるデジタル化された階調のデータを任意の階調に補正するために入力と出力の対照表を利用することによる所望の補正値により、入力に対する所望の直線的な出力特性とする補正値、さらに入力に対する所望の曲線的な出力特性とする補正値の生成が可能であることであっても一意に値が決定される補正信号を生成でき同様な効果が得られる。   The correction signal generation means uses a desired correction value by using a comparison table of input and output to correct digitized gradation data, which is a look-up table method, to an arbitrary gradation. Even if it is possible to generate a correction value with a linear output characteristic, and a correction value with a desired curvilinear output characteristic for the input, a correction signal whose value is uniquely determined can be generated. An effect is obtained.

又、画像信号で表わされる色空間がｓＲＧＢ表色系と、一意に変換が可能な表色系、例えばＲＧＢＡ表色系、若しくはＹＩＱ表色系、若しくはＹＣｂＣｒ表色系、若しくはＹＰｂＰｒ表色系、若しくはＸＹＺ表色系、若しくはｘｙＹ表色系、若しくはｘｖＹＣＣ表色系、で補正を行うことであっても同様な効果が得られる。   Further, the color space represented by the image signal is an sRGB color system and a color system that can be uniquely converted, for example, an RGBA color system, a YIQ color system, a YCbCr color system, or a YPbPr color system, Alternatively, the same effect can be obtained by performing correction in the XYZ color system, the xyY color system, or the xvYCC color system.

本発明は、画像信号の３原色信号であるＲ（赤）、Ｇ（緑）信号、Ｂ（青）信号のそれぞれの値が所望の条件を満たすかを検出する検出手段と、その検出手段の検出結果と前記入力の画像信号の値に応じて補正をかけるための補正信号を生成する補正信号生成手段と、その補正信号生成手段の補正信号に基づき前記入力の画像信号に補正を加え出力する補正手段と、を備えた画像信号の信号補正手段の動作方法であるため、
Ｒ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号のそれぞれの値が、所望する条件であるとき、Ｒ（赤）信号の値とＧ（緑）信号の値とに応じた補正信号を生成してＧ（緑）信号の補正を行う事や、Ｒ（赤）信号の値とＢ（青）信号の値に応じた補正信号を生成してＢ（青）信号の補正を行う事ができる。
従って、「濃い赤」であるＲ（赤）信号＝２５５、Ｇ（緑）信号＝０、Ｂ（青）信号＝０を検出して、少しだけ白を混ぜた「明るい赤」Ｒ（赤）信号＝２５５、Ｇ（緑）信号＝５１、Ｂ（青）信号＝５１や、短波長（オレンジ）寄りの「朱色」Ｒ（赤）信号＝２５５、Ｇ（緑）信号＝５１、Ｂ（青）信号＝０に補正することができる。
さらにＧ（緑）信号が所望する基準信号値以下を検出したとき、Ｒ（赤）信号の値とＧ（緑）信号の値とに応じた補正信号を生成してＧ（緑）信号の補正を行う事や、Ｂ（青）信号が所望する基準信号値以下を検出したとき、Ｒ（赤）信号とＢ（青）信号の値との値に応じた補正信号を生成してＢ（青）信号の補正を行う事もできる。
さらにＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号がそれぞれ所望する基準値との比較により、例えば「濃い緑」であるＲ（赤）信号＝０、Ｇ（緑）信号＝２５５、Ｂ（青）信号＝０を検出したとき、Ｇ（緑）信号とＢ（青）信号との値に応じた補正信号を生成して、Ｂ（青）信号の補正を行い、少しだけ青を混ぜた色Ｒ（赤）信号＝０、Ｇ（緑）信号＝２５５、Ｂ（青）信号＝５１に補正する事もできる。
従って、第１色盲を患う者でも上記の条件では判別が困難であったが、補正を行う事により判別が可能な表示とすることができ、健常者にも上記の条件以外では補正を行わないため違和感の少ない表示を可能とすることを特徴とする表示装置を提供できる。
さらにＢ（青）信号が所望する基準値以下を検出したとき、Ｒ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号から変換したＹ（輝度）信号とＢ（青）信号の値との値に応じた補正信号を生成して、Ｂ（青）信号の補正を行う事もできる。
従って、加齢と共に低下した青色系統の感度を補うため、Ｂ（青）信号の値が所望する基準値より低い場合にはＢ（青）信号を補正し、Ｂ（青）信号の値が所望する基準値より高い場合にはＢ（青）信号を補正しないことにより、高齢者にはＢ（青）信号の値が低い場合ではＢ（青）信号を補正しているため見やすくなり、Ｂ（青）信号の値が高い場合にはＢ（青）信号補正しないため高齢者以外の者にも違和感の少ない画像を表示することができることを特徴とする表示装置を提供できる。 The present invention provides a detection means for detecting whether each value of R (red), G (green) signal, and B (blue) signal, which are three primary color signals of an image signal, satisfies a desired condition, A correction signal generating means for generating a correction signal for performing correction according to the detection result and the value of the input image signal, and correcting and outputting the input image signal based on the correction signal of the correction signal generating means Since the operation method of the signal correction means of the image signal comprising the correction means,
When the values of the R (red) signal, the G (green) signal, and the B (blue) signal are the desired conditions, correction is performed according to the value of the R (red) signal and the value of the G (green) signal. A signal is generated to correct the G (green) signal, or a correction signal corresponding to the value of the R (red) signal and the value of the B (blue) signal is generated to correct the B (blue) signal. I can do things.
Therefore, “dark red” R (red) signal = 255, G (green) signal = 0, B (blue) signal = 0 are detected, and “bright red” R (red) mixed with a little white Signal = 255, G (green) signal = 51, B (blue) signal = 51, “Vermilion” R (red) signal = 255 near the short wavelength (orange), G (green) signal = 51, B (blue) ) Signal = 0 can be corrected.
Further, when the G (green) signal is detected below the desired reference signal value, a correction signal corresponding to the R (red) signal value and the G (green) signal value is generated to correct the G (green) signal. Or when a B (blue) signal is detected to be equal to or less than a desired reference signal value, a correction signal corresponding to the value of the R (red) signal and the B (blue) signal is generated and B (blue) ) Signal correction can also be performed.
Further, the R (red) signal, G (green) signal, and B (blue) signal are compared with the desired reference values, for example, R (red) signal = 0, G (green) signal = “dark green”, for example. 255, when a B (blue) signal = 0 is detected, a correction signal corresponding to the values of the G (green) signal and the B (blue) signal is generated, and the B (blue) signal is corrected. It is also possible to correct the color R (red) signal = 0, G (green) signal = 255, and B (blue) signal = 51 mixed with blue.
Therefore, even if the person suffers from the first color blindness is difficult to discriminate under the above conditions, it is possible to make a display that can be discriminated by performing correction, and the normal person is not corrected under the above conditions. Therefore, it is possible to provide a display device characterized by enabling display with less discomfort.
Further, when the B (blue) signal is detected below the desired reference value, the values of the Y (luminance) signal and the B (blue) signal converted from the R (red) signal, the G (green) signal, and the B (blue) signal It is also possible to generate a correction signal corresponding to the values of and to correct the B (blue) signal.
Therefore, in order to compensate for the sensitivity of the blue system that has decreased with aging, the B (blue) signal is corrected when the value of the B (blue) signal is lower than the desired reference value, and the value of the B (blue) signal is desired. If the reference value is higher than the reference value, the B (blue) signal is not corrected. For the elderly, the B (blue) signal is corrected when the value of the B (blue) signal is low. When the value of the blue signal is high, the B (blue) signal is not corrected, so that it is possible to provide a display device that can display an image with less discomfort to a person other than the elderly.

本発明に係る実施の形態例の画像信号補正手段１０の構成を説明するブロック図である。（実施例１）It is a block diagram explaining the structure of the image signal correction | amendment means 10 of the embodiment which concerns on this invention. Example 1 本発明に係る実施の形態例の画像信号補正手段１０Ｂの構成を説明するブロック図である。（実施例２）It is a block diagram explaining the structure of the image signal correction | amendment means 10B of the embodiment which concerns on this invention. (Example 2) 本発明に係る実施の形態例の画像信号補正手段１０Ｃの構成を説明するブロック図である。（実施例３）It is a block diagram explaining the structure of the image signal correction | amendment means 10C of the embodiment which concerns on this invention. (Example 3) 本発明に係る実施の形態例の画像信号補正手段１０Ｄの構成を説明するブロック図である。（実施例４）It is a block diagram explaining the structure of the image signal correction | amendment means 10D of the embodiment which concerns on this invention. Example 4 本発明に係る実施例１と実施例２の補正前の入力信号に対する補正後の出力信号の関係を表す代表値の例の図である。It is a figure of the example of the representative value showing the relationship of the output signal after correction | amendment with respect to the input signal before correction | amendment of Example 1 and Example 2 which concerns on this invention. 本発明に係る実施例２の補正前の入力信号に対する補正後の出力信号の関係を表す図５以外代表値の例の図である。It is a figure of the example of representative values other than FIG. 5 showing the relationship of the output signal after correction | amendment with respect to the input signal before correction | amendment of Example 2 which concerns on this invention. 本発明に係る実施例３の補正前の入力信号に対する補正後の出力信号の関係を表す一例の図である。It is a figure of an example showing the relationship of the output signal after correction | amendment with respect to the input signal before correction | amendment of Example 3 which concerns on this invention.

符号の説明Explanation of symbols

１０ 画像信号補正手段
１０Ｂ 画像信号補正手段
１０Ｃ 画像信号補正手段
１０Ｄ 画像信号補正手段
２０ 入力信号Ｒ用入力端子
３０ 入力信号Ｇ用入力端子
４０ 入力信号Ｂ用入力端子
５０ 検出手段
５０Ｂ 検出手段
５０Ｃ 検出手段
５０Ｄ 検出手段
５１ Ｒ基準信号生成手段
５１Ｃ Ｒ基準信号生成手段
５２ Ｇ基準信号生成手段
５２Ｂ Ｇ基準信号生成手段
５２Ｃ Ｇ基準信号生成手段
５３ Ｂ基準信号生成手段
５３Ｂ Ｂ基準信号生成手段
５３Ｃ Ｂ基準信号生成手段
５３Ｄ Ｂ基準信号生成手段
５４ 比較手段
５５ 比較手段
５６ 比較手段
５７ 論理積手段
５７Ｃ 論理積手段
６０ 補正信号生成手段
６０Ｂ 補正信号生成手段
６０Ｃ 補正信号生成手段
６０Ｄ 補正信号生成手段
６１ Ｇ補正信号生成手段
６１Ｂ Ｇ補正信号生成手段
６２ Ｂ補正信号生成手段
６２Ｂ Ｂ補正信号生成手段
６２Ｃ Ｂ補正信号生成手段
６２Ｄ Ｂ補正信号生成手段
６３Ｄ 変換手段
７０ 補正手段
７０Ｂ 補正手段
７０Ｃ 補正手段
７０Ｄ 補正手段
７１ Ｇ補正手段
７１Ｂ Ｇ補正手段
７２ Ｂ補正手段
７２Ｂ Ｂ補正手段
７２Ｃ Ｂ補正手段
７２Ｄ Ｂ補正手段
８０ 出力信号Ｒ用出力端子
９０ 出力信号Ｇ用出力端子
１００ 出力信号Ｂ用出力端子 DESCRIPTION OF SYMBOLS 10 Image signal correction means 10B Image signal correction means 10C Image signal correction means 10D Image signal correction means 20 Input signal R input terminal 30 Input signal G input terminal 40 Input signal B input terminal 50 Detection means 50B Detection means 50C Detection means 50D detection means 51 R reference signal generation means 51C R reference signal generation means 52 G reference signal generation means 52B G reference signal generation means 52C G reference signal generation means 53 B reference signal generation means 53B B reference signal generation means 53C B reference signal generation Means 53D B reference signal generation means 54 comparison means 55 comparison means 56 comparison means 57 logical product means 57C logical product means 60 correction signal generation means 60B correction signal generation means 60C correction signal generation means 60D correction signal generation means 61 G correction signal generation means 61B G correction signal generating means 62 B correction signal generating means 6 BB correction signal generation means 62C B correction signal generation means 62D B correction signal generation means 63D Conversion means 70 Correction means 70B Correction means 70C Correction means 70D Correction means 71 G correction means 71B G correction means 72 B correction means 72B B correction means 72C B correction means 72D B correction means 80 Output signal R output terminal 90 Output signal G output terminal 100 Output signal B output terminal

Claims (4)

３原色信号であるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号からなる画像信号を入力するＲ入力端子、Ｇ入力端子、Ｂ入力端子と、
Ｒ（赤）信号用の所望する基準信号を生成するＲ基準信号生成手段と
Ｇ（緑）信号用の所望する基準信号を生成するＧ基準信号生成手段と
Ｂ（青）信号用の所望する基準信号を生成するＢ基準信号生成手段と
前記Ｒ入力端子とＲ基準信号生成手段とに接続されたＲ比較手段と
前記Ｇ入力端子とＧ基準信号生成手段とに接続されたＧ比較手段と
前記Ｂ入力端子とＢ基準信号生成手段とに接続されたＢ比較手段と
それぞれの比較手段の結果の論理積の演算を行う論理積手段とを備え、
前記それぞれの入力端子から入力された画像信号と、それぞれの基準信号生成手段にて生成された基準信号とをそれぞれ比較する、つまり入力された画像信号が所望する条件を満たすかを検出する検出手段と、
前記Ｒ入力端子とＧ入力端子と検出手段とに接続され、その入力端子から入力されるＲ（赤）信号とＧ（緑）信号と検出結果とに基づき補正をかけるための、Ｇ（緑）信号用の補正信号を生成するＧ補正信号生成手段と、
前記Ｒ入力端子とＢ入力端子と検出手段とに接続され、その入力端子から入力されるＲ（赤）信号とＢ（青）信号と検出結果とに基づき補正をかけるための、Ｂ（青）信号用の補正信号を生成するＢ補正信号生成手段と、を備える補正信号生成手段と、
前記Ｇ入力端子と検出手段とＧ補正信号生成手段とに接続され、検出結果と補正信号とに基づきＧ入力端子から入力されるＧ（緑）信号の補正を行うＧ補正手段と、
前記Ｂ入力端子と検出手段とＢ補正信号生成手段とに接続され、検出結果と補正信号とに基づきＢ入力端子から入力されるＢ（青）信号の補正を行うＢ補正手段と、を備える補正手段と、
前記Ｒ入力端子に接続されたＲ（赤）信号を出力するＲ出力端子と、
前記Ｇ補正手段に接続されたＧ（緑）信号を出力するＧ出力端子と、
前記Ｂ補正手段に接続されたＢ（青）信号を出力するＢ出力端子と、を備えた画像信号補正手段の動作方法であって、
当該検出手段が、所望する条件である
入力されるＲ（赤）信号がＲ基準信号生成手段で生成される基準信号の値より大きく、且つ、
入力されるＧ（緑）信号がＧ基準信号生成手段で生成される基準信号の値より小さく、且つ、
入力されるＢ（青）信号がＢ基準信号生成手段で生成される基準信号の値より小さいことを検出し、その検出結果を補正信号生成手段に出力するステップと、
当該補正信号生成手段のＧ補正信号生成手段が、前記検出手段の所望する条件が満たされた情報である検出結果に基づき、検出手段からの所望する条件が満たされない場合には補正信号は生成せず、検出手段からの所望する条件が満たされた場合には補正信号を生成し、且つ、入力されるＲ（赤）信号の値とＧ（緑）信号の値とに応じて一意に値が決定される、つまりＲ（赤）信号の値とＧ（緑）信号の値との大小に関連して補正信号の値の大小が決定される補正信号を生成するステップと、
当該補正信号生成手段のＢ補正信号生成手段が、前記検出手段の所望する条件が満たされた情報である検出結果に基づき、検出手段からの所望する条件が満たされない場合には補正信号は生成せず、検出手段からの所望する条件が満たされた場合には補正信号を生成し、且つ、入力されるＲ（赤）信号の値とＢ（青）信号の値とに応じて一意に値が決定される、つまりＲ（赤）信号の値とＢ（青）信号の値との大小に関連して補正信号の値の大小が決定される補正信号を生成するステップと、
当該補正手段のＧ補正手段が、前記検出手段の所望する条件が満たされた情報である検出結果とＧ補正信号生成手段にて生成された補正信号に基づき、入力信号のＧ（緑）信号を前記Ｇ補正信号生成手段で生成した補正信号にて補正して、補正後のＧ（緑）信号を出力するステップ、
当該補正手段のＢ補正手段が、前記検出手段の所望する条件が満たされた情報である検出結果とＢ補正信号生成手段にて生成された補正信号に基づき、入力信号のＢ（青）信号を前記Ｂ補正信号生成手段で生成した補正信号にて補正して、補正後のＢ（青）信号を出力するステップ、
を実行することを特徴とする画像信号補正手段の動作方法。 An R input terminal, an G input terminal, and a B input terminal for inputting an image signal composed of an R (red) signal, a G (green) signal, and a B (blue) signal, which are three primary color signals;
R reference signal generating means for generating a desired reference signal for R (red) signal, G reference signal generating means for generating a desired reference signal for G (green) signal, and desired reference for B (blue) signal B reference signal generating means for generating a signal, R comparing means connected to the R input terminal and R reference signal generating means, G comparing means connected to the G input terminal and G reference signal generating means, and B B comparison means connected to the input terminal and the B reference signal generation means, and AND means for calculating the logical product of the results of the respective comparison means,
Detection means for comparing the image signals input from the respective input terminals with the reference signals generated by the respective reference signal generation means, that is, detecting whether the input image signal satisfies a desired condition When,
G (green) connected to the R input terminal, the G input terminal, and the detection means, and for applying correction based on the R (red) signal, the G (green) signal and the detection result input from the input terminal. G correction signal generating means for generating a correction signal for the signal;
B (blue) connected to the R input terminal, B input terminal, and detecting means, and for applying correction based on the R (red) signal, B (blue) signal and the detection result inputted from the input terminal. A correction signal generation means comprising: a B correction signal generation means for generating a correction signal for the signal;
G correction means connected to the G input terminal, detection means, and G correction signal generation means, for correcting a G (green) signal input from the G input terminal based on a detection result and a correction signal;
B correction means connected to the B input terminal, detection means, and B correction signal generation means, and for correcting a B (blue) signal input from the B input terminal based on the detection result and the correction signal. Means,
An R output terminal for outputting an R (red) signal connected to the R input terminal;
A G output terminal for outputting a G (green) signal connected to the G correction means;
A B output terminal for outputting a B (blue) signal connected to the B correction means, and an operation method of the image signal correction means,
The detection means has an input R (red) signal, which is a desired condition, greater than the value of the reference signal generated by the R reference signal generation means, and
The input G (green) signal is smaller than the value of the reference signal generated by the G reference signal generating means, and
Detecting that the input B (blue) signal is smaller than the value of the reference signal generated by the B reference signal generating means, and outputting the detection result to the correction signal generating means;
The G correction signal generation unit of the correction signal generation unit generates a correction signal when the desired condition from the detection unit is not satisfied based on the detection result that is information satisfying the condition desired by the detection unit. First, when a desired condition from the detection means is satisfied, a correction signal is generated, and the value is uniquely determined according to the input R (red) signal value and G (green) signal value. Generating a correction signal that is determined, that is, the magnitude of the value of the correction signal is determined in relation to the magnitude of the value of the R (red) signal and the value of the G (green) signal;
The correction signal generation unit of the correction signal generation unit generates a correction signal based on a detection result that is information satisfying a condition desired by the detection unit when a desired condition from the detection unit is not satisfied. First, when a desired condition from the detection means is satisfied, a correction signal is generated, and the value is uniquely determined according to the input R (red) signal value and B (blue) signal value. Generating a correction signal that is determined, that is, the magnitude of the value of the correction signal is determined in relation to the magnitude of the value of the R (red) signal and the value of the B (blue) signal;
The G correction means of the correction means generates a G (green) signal as an input signal based on a detection result that is information satisfying a condition desired by the detection means and a correction signal generated by the G correction signal generation means. Correcting with the correction signal generated by the G correction signal generating means and outputting a corrected G (green) signal;
The B correction unit of the correction unit calculates the B (blue) signal of the input signal based on the detection result that is information satisfying the condition desired by the detection unit and the correction signal generated by the B correction signal generation unit. Correcting with the correction signal generated by the B correction signal generating means and outputting a corrected B (blue) signal;
The operation method of the image signal correcting means, characterized in that ３原色信号であるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号からなる画像信号を入力するＲ入力端子、Ｇ入力端子、Ｂ入力端子と、
Ｇ（緑）信号用の所望する基準信号を生成するＧ基準信号生成手段と
Ｂ（青）信号用の所望する基準信号を生成するＢ基準信号生成手段と
前記Ｇ入力端子とＧ基準信号生成手段とに接続されたＧ比較手段と
前記Ｂ入力端子とＢ基準信号生成手段とに接続されたＢ比較手段と、を備え、
前記それぞれの入力端子から入力された画像信号と、それぞれの基準信号生成手段にて生成された基準信号とをそれぞれ比較する、つまり入力された画像信号が所望する条件を満たすかを検出する検出手段と、
前記Ｒ入力端子とＧ入力端子と検出手段のＧ比較手段とに接続され、その入力端子から入力されるＲ（赤）信号とＧ（緑）信号と検出結果とにより補正をかけるための、Ｇ（緑）信号用の補正信号を生成するＧ補正信号生成手段と、
前記Ｒ入力端子とＢ入力端子と検出手段のＢ比較手段とに接続され、その入力端子から入力されるＲ（赤）信号とＢ（青）信号と検出結果とにより補正をかけるための、Ｂ（青）信号用の補正信号を生成するＢ補正信号生成手段と、を備える補正信号生成手段と、
前記Ｇ補正信号生成手段とＧ入力端子とに接続され、Ｇ補正信号生成手段にて生成された補正信号に基づきＧ入力端子から入力されるＧ（緑）信号の補正を行うＧ補正手段と、
前記Ｂ補正信号生成手段とＢ入力端子とに接続され、Ｂ補正信号生成手段にて生成された補正信号に基づきＢ入力端子から入力されるＢ（青）信号の補正を行うＢ補正手段と、を備える補正手段と、
前記Ｒ入力端子に接続されたＲ（赤）信号を出力するＲ出力端子と、
前記Ｇ補正手段に接続されたＧ（緑）信号を出力するＧ出力端子と、
前記Ｂ補正手段に接続されたＢ（青）信号を出力するＢ出力端子と、を備えた画像信号補正手段の動作方法であって、
当該検出手段のＧ比較手段が、所望する条件である入力されるＧ（緑）信号がＧ基準信号生成手段で生成される基準信号の値より小さいことを検出し、その検出結果をＧ補正信号生成手段に出力するステップと、
当該検出手段のＢ比較手段が、所望する条件である入力されるＢ（青）信号がＢ基準信号生成手段で生成される基準信号の値より小さいことを検出し、その検出結果をＢ補正信号生成手段に出力するステップと、
当該補正信号生成手段のＧ補正信号生成手段が、前記検出手段のＧ比較手段からの所望する条件が満たされた情報である検出結果に基づき、入力されるＧ（緑）信号がＧ（緑）信号用の基準信号より大きい場合には補正信号は生成せず、入力されるＧ（緑）信号がＧ（緑）信号用の基準信号より小さい場合には補正信号を生成し、且つ、入力されるＲ（赤）信号の値とＧ（緑）信号の値とに応じて一意に値が決定される、つまりＲ（赤）信号の値とＧ（緑）信号の値との大小に関連して補正信号の値の大小が決定される補正信号を生成するステップと、
当該補正信号生成手段のＢ補正信号生成手段が、前記検出手段のＢ比較手段からの所望する条件が満たされた情報である検出結果に基づき、入力されるＢ（青）信号がＢ（青）信号用の基準信号より大きい場合には補正信号は生成せず、入力されるＢ（青）信号がＢ（青）信号用の基準信号より小さい場合には補正信号を生成し、且つ、入力されるＲ（赤）信号の値とＢ（青）信号の値とに応じて一意に値が決定される、つまりＲ（赤）信号の値とＢ（青）信号の値との大小に関連して補正信号の値の大小が決定される補正信号を生成するステップと、
当該補正手段のＧ補正手段が、前記Ｇ補正信号生成手段にて生成された補正信号に基づき、入力されたＧ（緑）信号を前記Ｇ補正信号生成手段で生成した補正信号にて補正して、補正後のＧ（緑）信号を出力するステップ、
当該補正手段のＢ補正手段が、前記Ｂ補正信号生成手段にて生成された補正信号に基づき、入力されたＢ（青）信号を前記Ｂ補正信号生成手段で生成した補正信号にて補正して、補正後のＢ（青）信号を出力するステップ、
を実行することを特徴とする画像信号補正手段の動作方法。 An R input terminal, an G input terminal, and a B input terminal for inputting an image signal composed of an R (red) signal, a G (green) signal, and a B (blue) signal, which are three primary color signals;
G reference signal generating means for generating a desired reference signal for G (green) signal, B reference signal generating means for generating a desired reference signal for B (blue) signal, the G input terminal, and the G reference signal generating means And a G comparison means connected to the B input means and a B comparison means connected to the B input terminal and the B reference signal generation means,
Detection means for comparing the image signals input from the respective input terminals with the reference signals generated by the respective reference signal generation means, that is, detecting whether the input image signal satisfies a desired condition When,
G is connected to the R input terminal, the G input terminal, and the G comparison means of the detection means, and is used to correct by the R (red) signal, the G (green) signal and the detection result inputted from the input terminal. G correction signal generation means for generating a correction signal for (green) signal;
B is connected to the R input terminal, the B input terminal, and the B comparison means of the detection means, and is used to make corrections based on the R (red) signal, the B (blue) signal and the detection result input from the input terminal. A correction signal generating means comprising: a B correction signal generating means for generating a correction signal for (blue) signal;
G correction means connected to the G correction signal generation means and the G input terminal, and for correcting a G (green) signal input from the G input terminal based on the correction signal generated by the G correction signal generation means;
B correction means connected to the B correction signal generating means and the B input terminal, for correcting a B (blue) signal input from the B input terminal based on the correction signal generated by the B correction signal generating means; Correction means comprising:
An R output terminal for outputting an R (red) signal connected to the R input terminal;
A G output terminal for outputting a G (green) signal connected to the G correction means;
A B output terminal for outputting a B (blue) signal connected to the B correction means, and an operation method of the image signal correction means,
The G comparison means of the detection means detects that the input G (green) signal, which is a desired condition, is smaller than the value of the reference signal generated by the G reference signal generation means, and the detection result is used as a G correction signal. Outputting to the generating means;
The B comparison means of the detection means detects that the input B (blue) signal, which is a desired condition, is smaller than the value of the reference signal generated by the B reference signal generation means, and the detection result is used as the B correction signal. Outputting to the generating means;
The G correction signal generation means of the correction signal generation means inputs the G (green) signal to be G (green) based on the detection result which is information satisfying the desired condition from the G comparison means of the detection means. When the signal is larger than the reference signal for signal, no correction signal is generated. When the input G (green) signal is smaller than the reference signal for G (green) signal, the correction signal is generated and input. The value is uniquely determined according to the value of the R (red) signal and the value of the G (green) signal, that is, it is related to the magnitude of the value of the R (red) signal and the value of the G (green) signal. Generating a correction signal in which the magnitude of the value of the correction signal is determined;
The B correction signal generation means of the correction signal generation means is based on a detection result which is information satisfying a desired condition from the B comparison means of the detection means, and the input B (blue) signal is B (blue). When the signal is larger than the signal reference signal, no correction signal is generated. When the input B (blue) signal is smaller than the reference signal for B (blue) signal, the correction signal is generated and input. The value is uniquely determined according to the value of the R (red) signal and the value of the B (blue) signal, that is, it is related to the magnitude of the value of the R (red) signal and the value of the B (blue) signal. Generating a correction signal in which the magnitude of the value of the correction signal is determined;
The G correction unit of the correction unit corrects the input G (green) signal with the correction signal generated by the G correction signal generation unit based on the correction signal generated by the G correction signal generation unit. Outputting a corrected G (green) signal;
Based on the correction signal generated by the B correction signal generation unit, the B correction unit of the correction unit corrects the input B (blue) signal with the correction signal generated by the B correction signal generation unit. Outputting a corrected B (blue) signal;
The operation method of the image signal correcting means, characterized in that ３原色信号であるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号からなる画像信号を入力するＲ入力端子、Ｇ入力端子、Ｂ入力端子と、
Ｒ（赤）信号用の所望する基準信号を生成するＲ基準信号生成手段と
Ｇ（緑）信号用の所望する基準信号を生成するＧ基準信号生成手段と
Ｂ（青）信号用の所望する基準信号を生成するＢ基準信号生成手段と
前記Ｒ入力端子とＲ基準信号生成手段とに接続されたＲ比較手段と
前記Ｇ入力端子とＧ基準信号生成手段とに接続されたＧ比較手段と
前記Ｂ入力端子とＢ基準信号生成手段とに接続されたＢ比較手段と
それぞれの比較手段の結果の論理積の演算を行う論理積手段と、を備え、
前記それぞれの入力端子から入力された画像信号と、それぞれの基準信号生成手段にて生成された基準信号とをそれぞれ比較する、つまり入力された画像信号が所望する条件を満たすかを検出する検出手段と、
前記Ｇ入力端子とＢ入力端子と検出手段とに接続され、その入力端子から入力されるＧ（緑）信号とＢ（青）信号と検出結果とに基づき補正をかけるための、Ｂ（青）信号用の補正信号を生成するＢ補正信号生成手段を備える補正信号生成手段と、
前記Ｂ入力端子とＢ補正信号生成手段とに接続され、Ｂ補正信号生成手段にて生成された補正信号に基づきＢ入力端子から入力されるＢ（青）信号の補正を行うＢ補正手段を備える補正手段と、
前記Ｒ入力端子に接続されたＲ（赤）信号を出力するＲ出力端子と、
前記Ｇ入力端子に接続されたＧ（緑）信号を出力するＧ出力端子と、
前記Ｂ補正手段に接続されたＢ（青）信号を出力するＢ出力端子と、
を備えた画像信号補正手段の動作方法であって、
当該検出手段が、所望する条件である、
入力されるＲ（赤）信号がＲ基準信号生成手段で生成される基準信号の値より小さく、且つ、
入力されるＧ（緑）信号がＧ基準信号生成手段で生成される基準信号の値より大きく、且つ、
入力されるＢ（青）信号がＢ基準信号生成手段で生成される基準信号の値より小さいことを検出し、その検出結果を補正信号生成手段に出力するステップと、
当該補正信号生成手段のＢ補正信号生成手段が、前記検出手段の所望する条件が満たされた情報である検出結果に基づき、検出手段からの所望する条件が満たされない場合には補正信号は生成せず、検出手段からの所望する条件が満たされた場合には補正信号を生成し、且つ、入力されるＧ（緑）信号の値とＢ（青）信号の値とに応じて一意に値が決定される、つまりＧ（緑）信号の値とＢ（青）信号の値との大小に関連して補正信号の値の大小が決定される補正信号を生成するステップと、
当該補正手段のＢ補正手段が、前記Ｂ補正信号生成手段にて生成された補正信号に基づき、入力されたＢ（青）信号をＢ補正信号生成手段で生成した補正信号にて補正して、その補正後のＢ（青）信号を出力するステップ、
を実行することを特徴とする画像信号補正手段の動作方法。 An R input terminal, an G input terminal, and a B input terminal for inputting an image signal composed of an R (red) signal, a G (green) signal, and a B (blue) signal, which are three primary color signals;
R reference signal generating means for generating a desired reference signal for R (red) signal, G reference signal generating means for generating a desired reference signal for G (green) signal, and desired reference for B (blue) signal B reference signal generating means for generating a signal, R comparing means connected to the R input terminal and R reference signal generating means, G comparing means connected to the G input terminal and G reference signal generating means, and B B comparison means connected to the input terminal and the B reference signal generation means, and AND means for calculating the logical product of the results of the respective comparison means,
Detection means for comparing the image signals input from the respective input terminals with the reference signals generated by the respective reference signal generation means, that is, detecting whether the input image signal satisfies a desired condition When,
B (blue) connected to the G input terminal, the B input terminal, and the detecting means, and for applying correction based on the G (green) signal, B (blue) signal and the detection result inputted from the input terminal. Correction signal generation means comprising B correction signal generation means for generating a correction signal for a signal;
B correction means connected to the B input terminal and the B correction signal generating means and for correcting the B (blue) signal input from the B input terminal based on the correction signal generated by the B correction signal generating means is provided. Correction means;
An R output terminal for outputting an R (red) signal connected to the R input terminal;
A G output terminal for outputting a G (green) signal connected to the G input terminal;
A B output terminal for outputting a B (blue) signal connected to the B correction means;
An operation method of the image signal correction means comprising:
The detection means is a desired condition.
The input R (red) signal is smaller than the value of the reference signal generated by the R reference signal generating means, and
The input G (green) signal is larger than the value of the reference signal generated by the G reference signal generating means, and
Detecting that the input B (blue) signal is smaller than the value of the reference signal generated by the B reference signal generating means, and outputting the detection result to the correction signal generating means;
The correction signal generation unit of the correction signal generation unit generates a correction signal based on a detection result that is information satisfying a condition desired by the detection unit when a desired condition from the detection unit is not satisfied. First, when a desired condition from the detection means is satisfied, a correction signal is generated, and the value is uniquely determined according to the input G (green) signal value and B (blue) signal value. Generating a correction signal that is determined, that is, the magnitude of the value of the correction signal is determined in relation to the magnitude of the value of the G (green) signal and the value of the B (blue) signal;
The B correction means of the correction means corrects the input B (blue) signal with the correction signal generated by the B correction signal generation means based on the correction signal generated by the B correction signal generation means, Outputting the corrected B (blue) signal;
The operation method of the image signal correcting means, characterized in that ３原色信号であるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号からなる画像信号を入力するＲ入力端子、Ｇ入力端子、Ｂ入力端子と、
Ｂ（青）信号用の所望する基準信号を生成するＢ基準信号生成手段と、
前記Ｂ入力端子とＢ基準信号生成手段とに接続された比較手段と、を備え、
Ｂ入力端子から入力されたＢ（青）信号と、Ｂ基準信号生成手段にて生成された基準信号とを比較し、入力されたＢ（青）信号が所望する条件を満たすかを検出する検出手段と、
前記Ｒ入力端子とＧ入力端子とＢ入力端子と検出手段とに接続され、その入力端子から入力されるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号からＹ（輝度）信号に変換する変換手段と、その変換手段により変換したＹ（輝度）信号とＢ（青）信号と前記検出手段の検出結果とに基づき補正をかけるための、Ｂ（青）信号用の補正信号を生成するＢ補正信号生成手段と、を備える補正信号生成手段と、
前記Ｂ補正信号生成手段とＢ入力端子とに接続され、Ｂ補正信号生成手段にて生成された補正信号に基づきＢ入力端子から入力されるＢ（青）信号の補正を行うＢ補正手段を備える補正手段と、
Ｒ入力端子に接続されたＲ（赤）信号を出力するＲ出力端子と、
Ｇ入力端子に接続されたＧ（緑）信号を出力するＧ出力端子と、
Ｂ補正手段に接続されたＢ（青）信号を出力するＢ出力端子と、
を備えた画像信号補正手段の動作方法であって、
当該検出手段が、所望する条件である入力されるＢ（青）信号がＢ基準信号生成手段で生成される基準信号の値より小さいことを検出し、その検出結果を補正信号生成手段のＢ補正信号生成手段に出力するステップと、
当該補正信号生成手段の変換手段が、入力端子から入力されるＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号をＹ（輝度）信号に変換し、その変換したＹ（輝度）信号を出力するステップと、
当該補正信号生成手段のＢ補正信号生成手段が、前記検出手段のＢ比較手段からの所望する条件が満たされた情報である検出結果に基づき、入力される画像信号のＢ（青）信号がＢ（青）信号用の基準信号より大きい場合には補正信号は生成せず、入力される画像信号のＢ（青）信号がＢ（青）信号用の基準信号より小さい場合に補正信号を生成し、且つ、入力される画像信号のＲ（赤）信号、Ｇ（緑）信号、Ｂ（青）信号から変換して得られたＹ（輝度）信号の値とＢ（青）信号の値とに応じて一意に値が決定される、つまりＹ（輝度）信号の値とＢ（青）信号の値との大小に関連して補正信号の値の大小が決定される補正信号を生成するステップと、
当該補正手段のＢ補正手段が、前記Ｂ補正信号生成手段にて生成された補正信号に基づき、入力されたＢ（青）信号を前記Ｂ補正信号生成手段が生成した補正信号にて補正して、その補正後のＢ（青）信号を出力するステップ、
を実行することを特徴とする画像信号補正手段の動作方法。 An R input terminal, an G input terminal, and a B input terminal for inputting an image signal composed of an R (red) signal, a G (green) signal, and a B (blue) signal, which are three primary color signals;
B reference signal generating means for generating a desired reference signal for the B (blue) signal;
Comparing means connected to the B input terminal and the B reference signal generating means,
Detection that detects whether the input B (blue) signal satisfies a desired condition by comparing the B (blue) signal input from the B input terminal with the reference signal generated by the B reference signal generation means Means,
An R (red) signal, a G (green) signal, and a B (blue) signal to a Y (luminance) signal connected to the R input terminal, the G input terminal, the B input terminal, and the detection means. A correction signal for the B (blue) signal for applying a correction based on the Y (luminance) signal, the B (blue) signal converted by the conversion means, and the detection result of the detection means. A correction signal generating means comprising: a B correction signal generating means for generating;
B correction means connected to the B correction signal generating means and the B input terminal, for correcting a B (blue) signal input from the B input terminal based on the correction signal generated by the B correction signal generating means. Correction means;
An R output terminal for outputting an R (red) signal connected to the R input terminal;
A G output terminal for outputting a G (green) signal connected to the G input terminal;
A B output terminal for outputting a B (blue) signal connected to the B correction means;
An operation method of the image signal correction means comprising:
The detection means detects that the input B (blue) signal, which is a desired condition, is smaller than the value of the reference signal generated by the B reference signal generation means, and the detection result is B corrected by the correction signal generation means. Outputting to the signal generating means;
The conversion means of the correction signal generation means converts the R (red) signal, G (green) signal, and B (blue) signal input from the input terminal into a Y (luminance) signal, and the converted Y (luminance) Outputting a signal;
The B correction signal generating means of the correction signal generating means is configured to detect that the B (blue) signal of the input image signal is B based on a detection result that is information satisfying a desired condition from the B comparing means of the detecting means. If the reference signal for (blue) signal is larger than the reference signal, no correction signal is generated. If the B (blue) signal of the input image signal is smaller than the reference signal for B (blue) signal, the correction signal is generated. In addition, the value of the Y (luminance) signal and the value of the B (blue) signal obtained by converting the R (red) signal, G (green) signal, and B (blue) signal of the input image signal Generating a correction signal whose value is uniquely determined in response, that is, the magnitude of the value of the correction signal is determined in relation to the magnitude of the value of the Y (luminance) signal and the value of the B (blue) signal; ,
The B correction unit of the correction unit corrects the input B (blue) signal with the correction signal generated by the B correction signal generation unit based on the correction signal generated by the B correction signal generation unit. , Outputting the corrected B (blue) signal;
The operation method of the image signal correcting means, characterized in that
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