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 |