JPH06121176A - Picture processing system for printing color original as monochromatic picture - Google Patents
Picture processing system for printing color original as monochromatic pictureInfo
- Publication number
- JPH06121176A JPH06121176A JP3361055A JP36105591A JPH06121176A JP H06121176 A JPH06121176 A JP H06121176A JP 3361055 A JP3361055 A JP 3361055A JP 36105591 A JP36105591 A JP 36105591A JP H06121176 A JPH06121176 A JP H06121176A
- Authority
- JP
- Japan
- Prior art keywords
- image
- original
- illumination
- red
- picture
- 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.)
- Pending
Links
- 230000000007 visual effect Effects 0.000 claims abstract description 7
- 238000001228 spectrum Methods 0.000 claims description 5
- 238000003672 processing method Methods 0.000 claims 1
- 238000005286 illumination Methods 0.000 abstract description 14
- 239000003086 colorant Substances 0.000 abstract description 5
- 230000003595 spectral effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 238000001444 catalytic combustion detection Methods 0.000 description 1
Landscapes
- Record Information Processing For Printing (AREA)
- Image Processing (AREA)
- Color Image Communication Systems (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、印刷機の画像処理方
式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing system for a printing machine.
【０００２】[0002]
【従来の技術】従来、モノクロで印刷する印刷機の、画
像を読み込む際の照明手段として緑色の発光ダイオード
が広く使われていた。これは、図３で示すように、緑色
の発光ダイオードのスペクトル特性の最大値を与える波
長が人間の可視領域のほぼ中心にあり、波長スペクトル
が可視領域を大方覆っているからであった。2. Description of the Related Art Heretofore, a green light emitting diode has been widely used as an illumination means for reading an image in a printing machine for monochrome printing. This is because, as shown in FIG. 3, the wavelength that gives the maximum value of the spectral characteristics of the green light emitting diode is almost in the center of the human visible region, and the wavelength spectrum covers the visible region largely.
【０００３】[0003]
【発明が解決しようとする課題】ところが、照明のスペ
クトル特性が平坦でないことは無視できなかった。実際
にカラーの原稿をスキャナにより読み取ってモノクロで
印刷すると、照明のスペクトルのエネルギーが小さくな
おかつ輝度ヘの寄与率の高い赤の部分は、照明のスペク
トルのエネルギーが大きい緑の部分と比較すると暗く、
原稿の明度の情報を反映しない画像となり印刷された。
人間の視覚特性が考慮され、印刷された画像で原稿の明
度が違和感なく再現されることは課題であった。However, it cannot be ignored that the spectral characteristics of the illumination are not flat. When a color original is actually read by a scanner and printed in monochrome, the red part, which has a small energy in the illumination spectrum and has a high contribution to luminance, is darker than the green part, which has a large energy in the illumination spectrum,
The image was printed as an image that does not reflect the brightness information of the original.
It was a problem to reproduce the lightness of the original in the printed image without any discomfort in consideration of human visual characteristics.
【０００４】[0004]
【課題を解決するための手段】この発明は上記の課題を
解決するためになされたものであり、カラー原稿を広帯
域のスペクトル分布を持つイメージ・スキャナにより読
み取り、モノクロのトナやインク等で紙等の媒体に画像
を印刷する画像処理装置において、赤と緑の２色の照明
装置と、それぞれの照明装置により原稿を時分割で照明
してイメージ・スキャナにより読み取られた２つの画像
入力値を、明度への寄与率の低い青を使わずに赤と緑の
みを用いた適切な計算により、人間の視覚特性を考慮し
た補正を行う画像処理手段を備えることにより、印刷さ
れたモノクロの画像が元のカラー原稿の明度を忠実に再
現することを可能にしたことを特徴とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a color original is read by an image scanner having a wide band spectral distribution, and a monochrome toner or ink is used for paper or the like. In an image processing apparatus for printing an image on a medium, two red and green illumination devices and two image input values read by an image scanner by illuminating a document by each illumination device in a time division manner, By providing an image processing unit that performs correction in consideration of human visual characteristics by appropriate calculation using only red and green without using blue, which has a low contribution to brightness, The feature is that it is possible to faithfully reproduce the brightness of the color original document.
【０００５】[0005]
【作用】本発明によれば、カラーの原稿の持つ明度分布
をモノクロの印刷により忠実に再現することができる。
光の３原色のうち、明度への寄与率の低い青は使わずに
赤と緑だけを使っているので、装置の構成を簡単にする
ことができる。According to the present invention, the lightness distribution of a color original can be faithfully reproduced by monochrome printing.
Of the three primary colors of light, red and green are used instead of blue, which has a low contribution to lightness, and therefore the configuration of the device can be simplified.
【０００６】以下、本発明の実施例を図面とともに説明
する。図１は本実施例による画像処理装置の構成を示
す。１はイメージ・スキャナ部、２は画像処理部、３は
印刷部、４は制御部である。１のイメージ・スキャナ部
は照明部１−１とイメージ・センサ１−２から成り、更
に、照明部１−１は赤のＬＥＤ１−１−１、緑のＬＥＤ
１−１−２、ＬＥＤ選択スイッチ１−１−３から成る。
赤と緑のＬＥＤとイメージ・スキャナの物理的な配置を
図２に示す。ＬＥＤアレイ５及びＬＥＤアレイ６では、
赤のＬＥＤと緑のＬＥＤが交互に配置されている。ＬＥ
Ｄアレイ５とＬＥＤアレイ６は、向かい合うＬＥＤの色
が異なるように平行に配置され、２つのアレイがＣＣＤ
のイメージ・センサ１−２を挟み、三者が一体となって
いる。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of an image processing apparatus according to this embodiment. Reference numeral 1 is an image scanner unit, 2 is an image processing unit, 3 is a printing unit, and 4 is a control unit. The image scanner unit 1 includes an illuminating unit 1-1 and an image sensor 1-2. Further, the illuminating unit 1-1 includes a red LED 1-1-1 and a green LED.
1-1-2 and LED selection switch 1-1-3.
The physical layout of the red and green LEDs and the image scanner is shown in FIG. In the LED array 5 and the LED array 6,
Red LEDs and green LEDs are arranged alternately. LE
The D array 5 and the LED array 6 are arranged in parallel so that the LEDs facing each other have different colors, and the two arrays are CCDs.
The image sensor 1-2 is sandwiched between and the three are integrated.
【０００７】本実施例の動作は次の通りである。イメー
ジ・スキャナ部１が画像の走査を行う。１主走査に対し
てＬＥＤ選択スイッチ１−１−３により赤と緑の２種類
の照明が時分割で行われる。イメージ・センサ１−２
は、それぞれの照明による２種類の輝度を出力する。画
像処理部２は、２種類の輝度に対して下記に示す計算に
より、人間の視覚特性を考慮した補正を行い、明度を得
る。明度は印刷部３に送られ印刷される。The operation of this embodiment is as follows. The image scanner unit 1 scans an image. Two types of illumination, red and green, are time-divisionally performed by the LED selection switch 1-1-3 for one main scan. Image sensor 1-2
Outputs two types of brightness according to each illumination. The image processing unit 2 obtains the brightness by performing the correction in consideration of human visual characteristics by the following calculation for the two types of luminance. The brightness is sent to the printing unit 3 and printed.
【０００８】本実施例における画像処理は以下に示す処
理１から処理３までの３つのステップから成る。 （処理１）真っ白な原稿を読み込んだときに最大輝度、
真っ黒な原稿を読み込んだときに最小輝度が得られるよ
うに調整された係数ａＲ、ｂＲ、ａＧ、ｂＧを使い、着
目画素において赤と緑のＬＥＤによる照明から得られた
輝度値ＩＲ，０、ＩＧ，０、を、数１を用いて、輝度値
ＩＲ，１、ＩＧ，１、に変換する。The image processing in this embodiment comprises the following three steps from processing 1 to processing 3. (Processing 1) Maximum brightness when scanning a white document,
Using the coefficients a R , b R , a G , and b G adjusted so that the minimum brightness is obtained when a black original is read, the brightness value I obtained from the illumination by the red and green LEDs in the pixel of interest. R, 0 and I G, 0 are converted into luminance values I R, 1 and I G, 1 using the equation 1 .
【０００９】[0009]
【数１】 [Equation 1]
【００１０】（処理２） （処理１）により得られた輝度値ＩＲ，１とＩ
Ｇ，１を、それぞれ、ＲＧＢ表色系のＲ成分とＧ成分と
考え、輝度への寄与率の小さいＢ成分を無視した数２を
用いて、ＸＹＺ表色系での輝度値Ｙに変換する。(Processing 2) Luminance values I R, 1 and I obtained by (Processing 1)
G and 1 are considered to be the R component and the G component of the RGB color system, respectively, and are converted to the luminance value Y in the XYZ color system by using Equation 2 in which the B component having a small contribution to the luminance is ignored. .
【００１１】[0011]
【数２】 [Equation 2]
【００１２】（処理３） （処理２）により得られた輝度値Ｙに対して、人の視覚
特性を考慮した、数３で表される輝度から明度への変換
を行い、最終的な明度値Ｖを得る。(Processing 3) The brightness value Y obtained by (Processing 2) is converted from the brightness represented by the equation 3 to the brightness in consideration of human visual characteristics, and the final brightness value is obtained. Get V.
【００１３】[0013]
【数３】 [Equation 3]
【００１４】[0014]
【発明の効果】以上で説明したように、本発明によれ
ば、赤と緑の２色だけの照明を使い人間の視覚特性を考
慮した補正を行うことにより、原稿と違和感の無い印刷
結果を得ることができる。As described above, according to the present invention, by using the illumination of only two colors of red and green and performing the correction in consideration of the human visual characteristics, the print result which is not incongruent with the original is obtained. Obtainable.
【００１５】[0015]
【図１】本発明の実施例における画像処理装置の構成図
である。FIG. 1 is a configuration diagram of an image processing apparatus according to an embodiment of the present invention.
【図２】本発明におけるイメージ・スキャナの物理的構
成を示す図である。FIG. 2 is a diagram showing a physical configuration of an image scanner according to the present invention.
【図３】一般に使われている緑のＬＥＤの波長スペクト
ルである。FIG. 3 is a wavelength spectrum of a commonly used green LED.
１…イメージ・スキャナ部 １−１…照明部 １−１−１…赤のＬＥＤ １−１−２…緑のＬＥＤ １−１−３…ＬＥＤ選択スイッチ １−２…イメージ・センサ ２…画像処理部 ３…印刷部 ４…制御部 ５…ＬＥＤアレイ ６…ＬＥＤアレイ DESCRIPTION OF SYMBOLS 1 ... Image scanner part 1-1 ... Illumination part 1-1-1 ... Red LED 1-1-2 ... Green LED 1-1-3 ... LED selection switch 1-2 ... Image sensor 2 ... Image processing Part 3 ... Printing part 4 ... Control part 5 ... LED array 6 ... LED array
Claims (1)
持つイメージ・スキャナにより読み取り、モノクロのト
ナーやインク等で紙等の媒体に画像を印刷する画像処理
装置において、赤と緑の２色の照明装置と、それぞれの
照明装置により原稿を時分割で照明してイメージ・スキ
ャナにより読み取られた２つの画像入力値を、明度への
寄与率の低い青を使わずに赤と緑のみを用いた適切な計
算により、人間の視覚特性を考慮した補正を行う画像処
理手段を備えることにより、印刷されたモノクロの画像
が元のカラー原稿の明度を忠実に再現することを可能に
した画像処理方式。1. An image processing apparatus for reading a color original with an image scanner having a wide wavelength spectrum and printing an image on a medium such as paper with monochrome toner or ink. And the two image input values read by the image scanner by illuminating the original in a time-division manner with respective illuminating devices and using only red and green without using blue, which has a low contribution to the brightness, An image processing method that enables the printed monochrome image to faithfully reproduce the lightness of the original color original by providing an image processing unit that performs correction in consideration of human visual characteristics by calculation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3361055A JPH06121176A (en) | 1991-12-18 | 1991-12-18 | Picture processing system for printing color original as monochromatic picture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3361055A JPH06121176A (en) | 1991-12-18 | 1991-12-18 | Picture processing system for printing color original as monochromatic picture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06121176A true JPH06121176A (en) | 1994-04-28 |
Family
ID=18472004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3361055A Pending JPH06121176A (en) | 1991-12-18 | 1991-12-18 | Picture processing system for printing color original as monochromatic picture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06121176A (en) |
-
1991
- 1991-12-18 JP JP3361055A patent/JPH06121176A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4252418B2 (en) | Method and system for processing multiple source images | |
| US7529003B2 (en) | Image scanning device and its control method | |
| US6404517B1 (en) | Color-patch sheet registration | |
| JP2018098630A5 (en) | ||
| EP0781036A1 (en) | Colour correction with consideration of the scene illuminant | |
| JPH1084487A (en) | Image processor and its method | |
| JP4920866B2 (en) | System for spectral multiplexing and rendering of source images and spectral demultiplexing to form animated source images | |
| CN108810315A (en) | Information processing unit, image processing system, control system and information processing method | |
| JP2019118031A (en) | Image processing method, image processing device, and image processing system | |
| JPH114353A (en) | Image processing method and system | |
| US7525685B2 (en) | True-color computer monitor preview of a color print | |
| US9413920B2 (en) | Scanner | |
| TWI225750B (en) | Method and apparatus for reproducing sepia-tone images | |
| US20030117435A1 (en) | Profile creating system | |
| JPH06121176A (en) | Picture processing system for printing color original as monochromatic picture | |
| JP3200093B2 (en) | Color image processing equipment | |
| US8498028B2 (en) | Image scanning apparatus, computer readable medium, and image scanning method | |
| JP7091852B2 (en) | Image processing device and image processing method | |
| JPH10164352A (en) | Image signal processing method | |
| JP3412699B2 (en) | Image forming device | |
| KR0135808B1 (en) | Color image display device | |
| JP2003163791A (en) | Image reader, light source unit, and light source control method | |
| JP2000134488A (en) | Image processing unit and its method | |
| JPH02266766A (en) | Color picture processor | |
| JP2021044650A (en) | Image processing device, program and image processing method |