JPH02254865A - Color picture reader - Google Patents
Color picture readerInfo
- Publication number
- JPH02254865A JPH02254865A JP1074905A JP7490589A JPH02254865A JP H02254865 A JPH02254865 A JP H02254865A JP 1074905 A JP1074905 A JP 1074905A JP 7490589 A JP7490589 A JP 7490589A JP H02254865 A JPH02254865 A JP H02254865A
- Authority
- JP
- Japan
- Prior art keywords
- color
- smoothing
- picture
- correction
- mtf characteristic
- 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
Links
- 238000009499 grossing Methods 0.000 abstract description 17
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Landscapes
- Transforming Light Signals Into Electric Signals (AREA)
- Color Television Image Signal Generators (AREA)
- Processing Of Color Television Signals (AREA)
- Facsimile Image Signal Circuits (AREA)
- Color Image Communication Systems (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野]
本発明はカラー画像読取装置に関し、特にカラーセンサ
ーの色ズレ補正に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a color image reading device, and particularly to color shift correction of a color sensor.
[従来の技術]
第6図に示すカラーセンサーにおいて色ズレ補正するた
めに第7図に示すようにカラーセンサー1の位置ズレを
ブルー(B)成分を中心としてグリーン(G)、レッド
(R)の各々の色成分の位置ズレを下記式19式2の線
形1次補間により補正する方法が提案されている。[Prior Art] In order to correct color misalignment in the color sensor shown in FIG. 6, as shown in FIG. 7, the positional shift of the color sensor 1 is corrected by focusing on the blue (B) component, green (G), and red (R). A method has been proposed in which the positional deviation of each color component is corrected by linear interpolation as shown in Equation 19 below.
2はカラーセンサー1の出力をディジタル信号に変換す
る^/D変換器、3は式1の演算回路、5は式2の演算
回路、6は演算回路3.5による遅延を合わせるための
遅延回路である。2 is a ^/D converter that converts the output of the color sensor 1 into a digital signal, 3 is an arithmetic circuit of Equation 1, 5 is an arithmetic circuit of Equation 2, and 6 is a delay circuit for matching the delay caused by the arithmetic circuit 3.5. It is.
C発明が解決しようとする課題]
前述した従来方式によれば、第8図のようにカラーセン
サーの読取り周期に原稿画像の周波数が近すけば近ずく
ほど、補正をしている色成分(Gn’、Rn’) と補
正をしていない色成分(Bn)とが解像度に違いを生じ
、その解像度の違いから色ズレが生じ黒い細線の解像度
が悪くなってしまうという欠点があった。C] According to the conventional method described above, as shown in FIG. 8, the closer the frequency of the original image is to the reading cycle of the color sensor, the more ', Rn') and the uncorrected color component (Bn) cause a difference in resolution, and this difference in resolution causes color shift, resulting in poor resolution of black thin lines.
本発明の目的は以上のような問題を解消したカラー画像
読取装置を提供することにある。An object of the present invention is to provide a color image reading device that solves the above-mentioned problems.
[課題を解決するための手段]
本発明は次の点を考慮した。すなわち、カラーセンサー
の各色成分の位相だけの補正では第2図に示すようにス
ムージングを行なわない色成分すなわち前記色ズレ補正
の中心色成分(Bn)のMTF特性を100%とした場
合、前記式12式2の色ズレ補正を行なった色成分(G
n’、Rn’)は1:2のスムージング演算を行なった
のと等価になるので色ズレ補正を行なわない色成分に対
してMTF特性の劣化がカラーバランスのくるいを生じ
画像の劣化となってしまう。[Means for Solving the Problems] The present invention takes into consideration the following points. In other words, when the MTF characteristic of the color component for which smoothing is not performed, that is, the center color component (Bn) of the color shift correction, is set to 100% in the correction of only the phase of each color component of the color sensor, as shown in FIG. 12 The color component (G
n', Rn') is equivalent to performing a 1:2 smoothing operation, so for color components for which color shift correction is not performed, the deterioration of the MTF characteristics will distort the color balance, resulting in image deterioration. It ends up.
そこで本発明は主走査方向に各色成分の画素を配置した
カラーセンサーと、カラーセンサーからの各色成分信号
の位相補正手段と、カラーセンサーからの各色成分信号
のMTF特性の補正手段とを具えるものである。Therefore, the present invention includes a color sensor in which pixels of each color component are arranged in the main scanning direction, a means for correcting the phase of each color component signal from the color sensor, and a means for correcting the MTF characteristics of each color component signal from the color sensor. It is.
[作 用]
本発明によれば、色ズレ補正の中心色成分と色ズレ補正
をした色成分とについて位相とMTF特性が合うように
補正することによりカラーセンサーの色ズレを補正し、
カラー画像の画質の向上をさせるものである。[Function] According to the present invention, the color shift of the color sensor is corrected by correcting the center color component of the color shift correction and the color component subjected to the color shift correction so that the phase and MTF characteristics match,
This improves the quality of color images.
[実施例] 以下、図面を参照して本発明の詳細な説明する。[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.
[実施例1]
第1図は本発明の実施例を示す図面であり、同図におい
て4は1:8:1の比でスムージングする演算回路であ
って、
式3の補正を行なう、他の構成は第7図と同様であり、
このような構成によれば、第2図に示すとおり第1図の
1:2のスムージング演算回路3および5によるMTF
特性と1:6:1のスムージング演算回路4によるMT
F特性がほぼ同じ特性となる。[Embodiment 1] FIG. 1 is a drawing showing an embodiment of the present invention, and in the figure, 4 is an arithmetic circuit that performs smoothing at a ratio of 1:8:1, and other circuits that perform correction of Equation 3. The configuration is the same as in Figure 7,
According to such a configuration, as shown in FIG. 2, the MTF by the 1:2 smoothing calculation circuits 3 and 5 of FIG.
MT with characteristics and 1:6:1 smoothing calculation circuit 4
The F characteristics are almost the same.
従って各色成分の位相とMTF特性を一致させることに
より、高周波画像における色ズレな補正可能にして、カ
ラーの解像度が良くなりカラー画像の画質が向上する。Therefore, by matching the phase and MTF characteristics of each color component, it is possible to correct color misregistration in a high-frequency image, improving color resolution and improving the image quality of the color image.
[実施例2コ
第3図は本発明の他の実施例を示す図面であり、同図に
おいて7は原稿、8,9はレンズである。[Embodiment 2] Fig. 3 is a drawing showing another embodiment of the present invention, in which 7 is a document, and 8 and 9 are lenses.
この実施例2では、色ズレ補正しない色成分(Bn)の
レンズ9を色ズレ補正を行なう色成分(Rn、Gn)の
レンズ8に対して第2図の1=2スムージングによるM
TF特性と同等となるものを使用することにより、高周
波画像における色ズレを補正でき、カラー画像の画質が
向上する。In this embodiment 2, the lens 9 of the color component (Bn) for which color misregistration is not corrected is compared to the lens 8 of the color components (Rn, Gn) for which color misregistration is corrected by the 1=2 smoothing shown in FIG.
By using one having the same TF characteristics, color shift in high-frequency images can be corrected, and the image quality of color images can be improved.
[実施例3]
第4図は本発明の実施例3を示す図面であり、同図にお
いて10はプログラマブルなスムージング回路、11は
CPU、ROM、RAM、Ilo等を含むcpu部であ
る。[Embodiment 3] FIG. 4 is a drawing showing Embodiment 3 of the present invention, in which 10 is a programmable smoothing circuit, and 11 is a CPU section including a CPU, ROM, RAM, Ilo, etc.
実施例3ではA/D変換器2からのG、B、R信号に対
し、下記に示す式49式52式6の補正をするためのパ
ラメータを620部11よりスムージング回路10に設
定することにより、カラーセンサーの色ズレ補正を行な
うものである。In the third embodiment, parameters for correcting the G, B, and R signals from the A/D converter 2 according to equations 49, 52, and 6 shown below are set in the smoothing circuit 10 from the 620 section 11. , which corrects the color shift of the color sensor.
、 Gn−+”4Gn”4Gn41Gn =
:式4第5図はスムージング回路
10の回路構成例を示す図面であり、乗算器12.除算
器14に式49式5、式6のパラメータを010部11
より設定できるようになっている。13は加算器、15
^、B、Cはラッチである。なおこのスムージング回路
10は3画素をサンプリングしてスムージングを行なっ
ているが、このサンプリング数は4画素、5画素でもよ
く各色成分の位相とMTF特性を合わせるようなスムー
ジング処理を行なえば本発明の範囲内であることは明白
である。, Gn-+"4Gn"4Gn41Gn=
:Equation 4 FIG. 5 is a drawing showing an example of the circuit configuration of the smoothing circuit 10, in which the multiplier 12. Enter the parameters of equation 49, equation 5, and equation 6 into the divider 14 as 010 part 11
It is now more configurable. 13 is an adder, 15
^, B, and C are latches. Although this smoothing circuit 10 performs smoothing by sampling three pixels, the number of samples may be four or five pixels, and the scope of the present invention is within the scope of the present invention as long as smoothing processing is performed to match the phase and MTF characteristics of each color component. It is clear that it is within.
実施例3のようにプログラマブルなスムージング回路を
有するものは、画像読取装置のモアレ発生を防止する位
のパラメータを設定することにょリモアレの発生を防止
する効果もある。The device having a programmable smoothing circuit as in the third embodiment has the effect of preventing the occurrence of moiré by setting parameters that can prevent the occurrence of moiré in the image reading device.
[発明の効果コ
以上説明したように本発明によれば、カラーセンサーの
色成分の位置ズレによる位相を合わせるだけでなく、各
色成分のMTF特性を合わせるようにすることで、より
正確な色ズレ補正が可能となりカラー画像読取装置の画
質を向上することができる効果がある。[Effects of the Invention] As explained above, according to the present invention, not only the phases due to positional deviations of the color components of the color sensor are matched, but also the MTF characteristics of each color component are matched, thereby achieving more accurate color misalignment. This has the effect of making correction possible and improving the image quality of the color image reading device.
第1図は本発明実施例1のブロック図、第2図は、MT
F特性を示す図、
第3図は本発明実施例2の概要を示す図、第4図発明本
発明実施例3のブロック図、第5図はスムージング回路
のブロック図、第6図はカラーセンサーの構造を示す図
、第7図は従来のカラー画像読取装置のブロック図、
第8図はカラーセンサーの読取周期と原稿画像の周波数
との関係を示す図である。
第
図
第
図
一一一−ヱ乏炎
第
図
第
図FIG. 1 is a block diagram of Embodiment 1 of the present invention, and FIG. 2 is a block diagram of MT
Figure 3 is a diagram showing the outline of the second embodiment of the present invention, Figure 4 is a block diagram of the third embodiment of the present invention, Figure 5 is a block diagram of the smoothing circuit, and Figure 6 is a color sensor. 7 is a block diagram of a conventional color image reading device, and FIG. 8 is a diagram showing the relationship between the reading cycle of a color sensor and the frequency of an original image. Figure Figure 111 - Epletion Flame Figure Figure 111
Claims (1)
サーと、該カラーセンサーからの各色成分信号の位相補
正手段と、前記カラーセンサーからの各色成分信号のM
TF特性の補正手段とを具えたことを特徴とするカラー
画像読取装置。1) A color sensor in which pixels of each color component are arranged in the main scanning direction, a phase correction means for each color component signal from the color sensor, and an M for each color component signal from the color sensor.
1. A color image reading device comprising: means for correcting TF characteristics.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1074905A JP2954231B2 (en) | 1989-03-29 | 1989-03-29 | Color image processing method and color image processing apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1074905A JP2954231B2 (en) | 1989-03-29 | 1989-03-29 | Color image processing method and color image processing apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH02254865A true JPH02254865A (en) | 1990-10-15 |
JP2954231B2 JP2954231B2 (en) | 1999-09-27 |
Family
ID=13560872
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1074905A Expired - Fee Related JP2954231B2 (en) | 1989-03-29 | 1989-03-29 | Color image processing method and color image processing apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2954231B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5757520A (en) * | 1994-12-13 | 1998-05-26 | Fuji Xerox Co., Ltd. | Color linear image sensor and an image processing system |
US6958772B1 (en) | 1999-01-20 | 2005-10-25 | Canon Kabushiki Kaisha | Image sensing apparatus and image processing method therefor |
-
1989
- 1989-03-29 JP JP1074905A patent/JP2954231B2/en not_active Expired - Fee Related
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5757520A (en) * | 1994-12-13 | 1998-05-26 | Fuji Xerox Co., Ltd. | Color linear image sensor and an image processing system |
US6958772B1 (en) | 1999-01-20 | 2005-10-25 | Canon Kabushiki Kaisha | Image sensing apparatus and image processing method therefor |
US7542076B2 (en) | 1999-01-20 | 2009-06-02 | Canon Kabushiki Kaisha | Image sensing apparatus having a color interpolation unit and image processing method therefor |
US7929026B2 (en) | 1999-01-20 | 2011-04-19 | Canon Kabushiki Kaisha | Image sensing apparatus and image processing method thereof using color conversion and pseudo color removing |
Also Published As
Publication number | Publication date |
---|---|
JP2954231B2 (en) | 1999-09-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |