JPH07182479A - Picture processor - Google Patents

Picture processor

Info

Publication number
JPH07182479A
JPH07182479A JP5322873A JP32287393A JPH07182479A JP H07182479 A JPH07182479 A JP H07182479A JP 5322873 A JP5322873 A JP 5322873A JP 32287393 A JP32287393 A JP 32287393A JP H07182479 A JPH07182479 A JP H07182479A
Authority
JP
Japan
Prior art keywords
color
optimized
picture
parameter
mode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP5322873A
Other languages
Japanese (ja)
Other versions
JP3346862B2 (en
Inventor
Shogo Oneda
章吾 大根田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP32287393A priority Critical patent/JP3346862B2/en
Priority to US08/359,145 priority patent/US5828780A/en
Publication of JPH07182479A publication Critical patent/JPH07182479A/en
Application granted granted Critical
Publication of JP3346862B2 publication Critical patent/JP3346862B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE:To correct a color with optimum in accordance with the pattern of a picture. CONSTITUTION:A color correction means 100 color-corrects an inputted input chrominance signal in accordance with a parameter which is set, sets it to be an output chrominance signal and outputs it. An output means 101 records the picture on transfer paper based on the inputted output chrominance signal. A parameter calculation means 102 sets an indicated optimized color to be a fixed point and compresses a color reproduction range or calculates the parameter based on the fixed point. An optimized color deciding means 103 decides the color of the central part of the picture or one color in a part whose area in the picture is a maximum as the optimized color in accordance with an indication. An operation means 104 is provided with a switch for selecting a central mode by which the color of the central part of the picture is set to be the optimized color and a maximum mode by which the color of the part whose area is the maximum is set to be the optimized color, and the central mode is usually selected.

Description

【発明の詳細な説明】Detailed Description of the Invention

【産業上の利用分野】この発明は、入力画像デ−タにパ
ラメ−タを用いて色補正をして処理する画像処理装置に
関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing apparatus for performing color correction on input image data using parameters and processing the same.

【0002】[0002]

【従来の技術】従来、出力装置の特性に対する補正のた
めのパラメ−タを一度決定したら、どのような画像であ
っても同一のパラメ−タによって画像処理を行ってい
た。このパラメ−タは、全ての色に対する二乗誤差の平
均を最小にするようにして決定されるのが一般的である
が、この色の中には当然誤差が小さい色や大きい色が存
在し、画像の絵柄によっては、この誤差が大きい色がそ
の絵柄にとって重要な色である場合もある。このため、
人物の画像出力が多い出力装置においては、肌色を重要
視してパラメ−タを決定している場合がある。しかしな
がら、この場合には人物以外の画像に対しての誤差が大
きくなってしまう問題点があった。つまり、絵柄によっ
て最適なパラメ−タを選ぶことができないという問題点
があった。また、入力信号の色再現範囲(Gamut)
が出力装置の色再現範囲よりも広い場合には、図1に示
すように入力信号の色再現範囲を一様に圧縮してしまう
ので、正確に再現したい色まで圧縮されて色がずれてし
まうという問題点もあった。
2. Description of the Related Art Conventionally, once a parameter for correcting a characteristic of an output device is determined, image processing is performed by the same parameter for any image. This parameter is generally determined so as to minimize the mean squared error for all colors, but of course, there are colors with small errors and large colors among these colors. Depending on the design of the image, a color having a large error may be an important color for the design. For this reason,
In an output device that outputs a lot of images of a person, the skin color may be regarded as important and the parameters may be determined. However, in this case, there is a problem that an error with respect to an image other than a person becomes large. That is, there is a problem that the optimum parameter cannot be selected depending on the design. Also, the color reproduction range (Gamut) of the input signal
Is wider than the color reproduction range of the output device, the color reproduction range of the input signal is uniformly compressed as shown in FIG. 1, so that the color to be accurately reproduced is compressed and the color shifts. There was also a problem.

【0003】[0003]

【発明が解決しようとする課題】請求項1の発明は、画
像の絵柄に応じた最適な色補正をすることを目的とす
る。
SUMMARY OF THE INVENTION An object of the present invention is to perform an optimum color correction according to a picture pattern of an image.

【0004】請求項2,3の発明は、画像の絵柄に応じ
た最適な色補正を自動的に行うことを目的とする。
It is an object of the inventions of claims 2 and 3 to automatically perform the optimum color correction according to the pattern of the image.

【0005】[0005]

【課題を解決するための手段】請求項1の発明は、上記
の目的を達成するため、入力画像デ−タにパラメ−タを
用いて色補正をして処理する画像処理装置において、前
記入力画像デ−タ中の色を選択する操作手段と、前記操
作手段により選択された色に応じてパラメ−タを算出す
るパラメ−タ算出手段とを備えることを特徴とする。
In order to achieve the above object, the invention of claim 1 is an image processing apparatus for performing color correction by using parameters for input image data for processing. It is characterized by comprising an operating means for selecting a color in the image data and a parameter calculating means for calculating a parameter in accordance with the color selected by the operating means.

【0006】請求項2の発明は、上記の目的を達成する
ため、請求項1の操作手段は、入力画像デ−タからなる
入力画像の中央部分の色を選択すること特徴とする。
In order to achieve the above object, the invention of claim 2 is characterized in that the operating means of claim 1 selects the color of the central portion of the input image consisting of the input image data.

【0007】請求項3の発明は、上記の目的を達成する
ため、請求項1の操作手段は、入力画像デ−タからなる
入力画像中の色が最大面積である部分の色を選択するこ
と特徴とする。
In order to achieve the above-mentioned object, the operation means of claim 1 selects the color of the portion having the maximum area in the input image consisting of the input image data. Characterize.

【0008】[0008]

【作用】請求項1の発明によれば、入力画像デ−タにパ
ラメ−タを用いて色補正をして処理する画像処理装置に
おいて、前記入力画像デ−タ中の色を選択する操作手段
と、前記操作手段により選択された色に応じてパラメ−
タを算出するパラメ−タ算出手段とを備えたので、画像
の絵柄に応じた最適な色補正をすることができる。
According to the first aspect of the present invention, in the image processing apparatus for performing color correction on the input image data by using the parameters, the operating means for selecting the color in the input image data. And the parameter depending on the color selected by the operating means.
Since the parameter calculation means for calculating the parameter is provided, it is possible to perform the optimum color correction according to the pattern of the image.

【0009】請求項2の発明によれば、請求項1の操作
手段は、入力画像デ−タからなる入力画像の中央部分の
色を選択するので、画像の絵柄に応じた最適な色補正を
自動的に行うことができる。
According to the second aspect of the invention, the operating means of the first aspect selects the color of the central portion of the input image consisting of the input image data, so that the optimum color correction according to the picture pattern of the image is performed. It can be done automatically.

【0010】請求項3の発明によれば、請求項1の操作
手段は、入力画像デ−タからなる入力画像中の色が最大
面積である部分の色を選択するので、画像の絵柄に応じ
た最適な色補正を自動的に行うことができる。
According to the third aspect of the invention, the operating means of the first aspect selects the color of the portion of the input image consisting of the input image data in which the color has the largest area. Optimal color correction can be performed automatically.

【0011】[0011]

【実施例】図2を用いて、本発明の実施例の全体構成図
を説明する。色補正回路である色補正手段100は、入
力された入力色信号を設定されたパラメ−タに応じて色
補正し、出力色信号にして出力する。プリンタである出
力手段101は、入力された出力色信号に基づいて転写
紙に画像を記録する。パラメ−タ算出回路であるパラメ
−タ算出手段102は、指示された最適化色を図3の色
空間に示すように固定点とし、この固定点に基づいて予
め設定された入力信号のGamutと出力装置のGam
utとから色再現範囲の圧縮をしたりパラメ−タの算出
をしたりし、色補正手段100にパラメ−タを設定す
る。最適化色決定回路である最適化色決定手段103
は、図4に顔部分として示したような画像の中心部分の
色、または図5に青空部分として示したような画像中の
面積が最大である部分の色の一方を指示に応じて最適化
色として決定し、パラメ−タ算出手段102に最適化色
を指示する。操作パネルである操作手段104は、画像
の中心部分の色を最適色とする中心モ−ドと面積が最大
である部分の色を最適化色とする最大モ−ドとを選択す
るためのスイッチが設けられており、通常は中心モ−ド
が選択されていて、最適化色決定手段103に一方のモ
−ドを指示する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An overall configuration diagram of an embodiment of the present invention will be described with reference to FIG. The color correction means 100, which is a color correction circuit, corrects the color of the input color signal that has been input according to the set parameters, and outputs the color signal as an output color signal. The output unit 101, which is a printer, records an image on a transfer sheet based on the input output color signal. The parameter calculation means 102, which is a parameter calculation circuit, sets the designated optimized color as a fixed point as shown in the color space of FIG. 3, and sets the Gamut of the input signal preset based on the fixed point. Output device Gam
The color reproduction range is compressed and parameters are calculated from ut and ut, and the parameters are set in the color correction means 100. Optimized color determination means 103, which is an optimized color determination circuit
Is optimized according to the instruction, either the color of the central portion of the image shown as the face portion in FIG. 4 or the color of the portion having the largest area in the image shown as the blue sky portion in FIG. The color is determined and the optimized color is instructed to the parameter calculation means 102. The operation means 104, which is an operation panel, is a switch for selecting the central mode in which the color of the central portion of the image is the optimum color and the maximum mode in which the color of the portion having the largest area is the optimal color. Is provided and the central mode is usually selected, and one mode is instructed to the optimized color determining means 103.

【0012】図6のフロ−チャ−トを用いて最適化色決
定手段103の制御を説明する。S601は、指示され
ているモ−ドを検出するステップであり、中心モ−ドで
あるかを判定している。S602は、S601において
中心モ−ドであることが検出されたときに、画像の中心
部分の色を判定して最適化色とするステップである。S
603は、S601において中心モ−ドでないことが検
出されたときに、つまり、最大モ−ドであるときに、画
像中に使われている色の数のヒストグラムを作成するス
テップである。S604は、ヒストグラムの中で最大値
を示している色(画像中の面積が最大の色)を判定して
最適化色とするステップである。S605は、パラメ−
タ算出手段102に最適化色を指示するステップであ
る。
The control of the optimized color determining means 103 will be described with reference to the flowchart of FIG. S601 is a step of detecting the instructed mode, and it is determined whether or not the mode is the central mode. S602 is a step of determining the color of the central portion of the image and setting it as an optimized color when the central mode is detected in S601. S
Step 603 is a step of creating a histogram of the number of colors used in the image when it is detected in S601 that the mode is not the center mode, that is, when the mode is the maximum mode. S604 is a step of determining the color showing the maximum value in the histogram (the color having the largest area in the image) and making it the optimized color. S605 is the parameter
In this step, the optimized color is instructed to the computer calculation means 102.

【0013】図7のフロ−チャ−トを用いてパラメ−タ
算出手段102の制御を説明する。S701は、予め設
定された入力信号のGamutと出力装置のGamut
を読み取るステップである。S702は、指示された最
適化色を読み取るステップである。S703は、最適化
色を図3の色空間に示すように固定点とし、この固定点
に基づいて入力信号のGamutと出力装置のGamu
tとから色再現範囲の圧縮をするステップである。S7
04は、色再現範囲の圧縮に応じて決定される補正のた
めのパラメ−タの算出をするステップである。S705
は、色補正手段100にパラメ−タを設定するステップ
である。尚、色再現範囲の圧縮の方法は、色相をそのま
まにし明度、彩度を一様に圧縮する方法や、色再現範囲
を弾性体と仮定して弾性変形させる方法などがあり、そ
の他どのような方法を利用してもよい。また、パラメ−
タ算出の方法は、固定点を最少誤差とする拘束条件をい
れた最少自乗法などが考えられる。
The control of the parameter calculating means 102 will be described with reference to the flowchart of FIG. In step S701, Gamut of an input signal and Gamut of an output device set in advance are set.
Is the step of reading. S702 is a step of reading the instructed optimized color. In step S703, the optimized color is set to a fixed point as shown in the color space of FIG. 3, and the Gamut of the input signal and the Gamu of the output device are set based on the fixed point.
This is a step of compressing the color reproduction range from t and t. S7
Reference numeral 04 is a step for calculating parameters for correction determined according to the compression of the color reproduction range. S705
Is a step of setting parameters in the color correction means 100. Note that the method of compressing the color reproduction range includes a method of uniformly compressing the lightness and saturation while keeping the hue as it is, and a method of elastically deforming assuming the color reproduction range as an elastic body. A method may be used. Also, the parameter
As a method of calculating the data, the least square method including a constraint condition in which a fixed point has a minimum error can be considered.

【0014】[0014]

【発明の効果】以上説明したように、請求項1の発明に
よれば、画像の絵柄に応じた最適な色補正をすることが
できる。
As described above, according to the first aspect of the invention, it is possible to perform the optimum color correction according to the pattern of the image.

【0015】請求項2,3の発明によれば、画像の絵柄
に応じた最適な色補正を自動的に行うことができる。
According to the inventions of claims 2 and 3, it is possible to automatically perform the optimum color correction according to the pattern of the image.

【0016】[0016]

【図面の簡単な説明】[Brief description of drawings]

【図1】 従来の色再現範囲の圧縮を示すモデル図FIG. 1 is a model diagram showing compression of a conventional color reproduction range.

【図2】 本発明の全体構成を示すブロック図FIG. 2 is a block diagram showing the overall configuration of the present invention.

【図3】 本発明の色再現範囲の圧縮等を示すモデル図FIG. 3 is a model diagram showing compression of a color reproduction range according to the present invention.

【図4】 中心モ−ドを選択したときを示す図FIG. 4 is a diagram showing a case where a center mode is selected.

【図5】 最大モ−ドを選択したときを示す図FIG. 5 is a diagram showing a case where the maximum mode is selected.

【図6】 最適化色決定手段の制御を示すフロ−チャ−
FIG. 6 is a flowchart showing the control of the optimized color determining means.
To

【図7】 パラメ−タ算出手段の制御を示すフロ−チャ
−ト
FIG. 7 is a flow chart showing control of parameter calculation means.

【符号の説明】[Explanation of symbols]

100 色補正手段 101 出力手段 102 パラメ−タ算出手段 103 最適化色決定手段 104 操作手段 105 操作パネル 100 color correction means 101 output means 102 parameter calculation means 103 optimized color determination means 104 operation means 105 operation panel

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 H04N 1/46 G06F 15/68 310 A H04N 1/40 D 1/46 Z ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display location H04N 1/46 G06F 15/68 310 A H04N 1/40 D 1/46 Z

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 入力画像デ−タにパラメ−タを用いて色
補正をして処理する画像処理装置において、 前記入力画像デ−タ中の色を選択する操作手段と、 前記操作手段により選択された色に応じてパラメ−タを
算出するパラメ−タ算出手段とを備える画像処理装置。
1. An image processing apparatus for color-correcting and processing input image data using parameters, comprising: operating means for selecting a color in the input image data; and selecting by the operating means. An image processing apparatus including a parameter calculation unit that calculates a parameter in accordance with the generated color.
【請求項2】 前記操作手段は、入力画像デ−タからな
る入力画像の中央部分の色を選択すること特徴とする請
求項1に記載の画像処理装置。
2. The image processing apparatus according to claim 1, wherein the operation unit selects a color of a central portion of an input image composed of input image data.
【請求項3】 前記操作手段は、入力画像デ−タからな
る入力画像中の色が最大面積である部分の色を選択する
こと特徴とする請求項1に記載の画像処理装置。 【0001】
3. The image processing apparatus according to claim 1, wherein the operation unit selects a color of a portion of the input image composed of the input image data, the color of which has a maximum area. [0001]
JP32287393A 1993-12-21 1993-12-21 Image processing device Expired - Fee Related JP3346862B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP32287393A JP3346862B2 (en) 1993-12-21 1993-12-21 Image processing device
US08/359,145 US5828780A (en) 1993-12-21 1994-12-19 Image processing apparatus with improved color correction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP32287393A JP3346862B2 (en) 1993-12-21 1993-12-21 Image processing device

Publications (2)

Publication Number Publication Date
JPH07182479A true JPH07182479A (en) 1995-07-21
JP3346862B2 JP3346862B2 (en) 2002-11-18

Family

ID=18148568

Family Applications (1)

Application Number Title Priority Date Filing Date
JP32287393A Expired - Fee Related JP3346862B2 (en) 1993-12-21 1993-12-21 Image processing device

Country Status (1)

Country Link
JP (1) JP3346862B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7221476B2 (en) 2001-06-07 2007-05-22 Noritsu Koki Co., Ltd. Picture image processing apparatus and method, and picture processing system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7221476B2 (en) 2001-06-07 2007-05-22 Noritsu Koki Co., Ltd. Picture image processing apparatus and method, and picture processing system

Also Published As

Publication number Publication date
JP3346862B2 (en) 2002-11-18

Similar Documents

Publication Publication Date Title
JP3011432B2 (en) Color image processing equipment
EP1292108B1 (en) Image processing apparatus for print process of photographed image
US4931864A (en) Image forming apparatus which performs gamma correction on the basis of a cumulative frequency distribution produced from a histogram of image data representing a selected area of an image
JP3359116B2 (en) Image processing method and apparatus
US6947078B1 (en) Color correction apparatus, color correction method, and recording medium having color correction control program recorded
US6563602B1 (en) Image processing apparatus and method, and recording medium
JP2003111005A (en) Image processing method and apparatus, and its program
JPH099083A (en) Color picture processor
US6850272B1 (en) Image processing method and system
JP3943973B2 (en) Image processing apparatus and method
JP2008072253A (en) Image processor and processing method
JPH0787587B2 (en) Gradation correction device
JP2003174567A (en) Generation method for conversion table, program and color copying machine
JP3800873B2 (en) Image processing apparatus and method
JPH05103336A (en) Color video signal processing device and color correcting method for color video signal
JP3179528B2 (en) Color image processing apparatus and method
JPH07182479A (en) Picture processor
JP2001016452A (en) Image processor, image reader loading the same. image forming device and image processing method
JPH0832060B2 (en) Color image processing method
JPH08214175A (en) Image processing method
JP2648206B2 (en) Method of setting output value correction table in image input / output device
JPH0440072A (en) Color correcting system for digital color picture processor
JPH041771A (en) Copying machine
JPH042265A (en) Information output device for copying machine
JP3000723B2 (en) Display device with color correction status

Legal Events

Date Code Title Description
FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080906

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080906

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090906

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090906

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100906

Year of fee payment: 8

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110906

Year of fee payment: 9

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120906

Year of fee payment: 10

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130906

Year of fee payment: 11

LAPS Cancellation because of no payment of annual fees