JPH0254676A - Picture processing method - Google Patents
Picture processing methodInfo
- Publication number
- JPH0254676A JPH0254676A JP63206138A JP20613888A JPH0254676A JP H0254676 A JPH0254676 A JP H0254676A JP 63206138 A JP63206138 A JP 63206138A JP 20613888 A JP20613888 A JP 20613888A JP H0254676 A JPH0254676 A JP H0254676A
- Authority
- JP
- Japan
- Prior art keywords
- coefficient
- input
- output
- line
- ccd
- 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
- 238000003672 processing method Methods 0.000 title claims description 4
- 238000000034 method Methods 0.000 claims abstract description 3
- 238000009792 diffusion process Methods 0.000 claims description 6
- 239000006185 dispersion Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
- Facsimile Image Signal Circuits (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野]
本発明は画像をデジタル信号として扱うデジタンレプリ
ンタ、及びデジタル複写機等の画像形成装置における画
像処理方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image processing method in an image forming apparatus such as a digital reprinter and a digital copying machine that handle images as digital signals.
[従来の技術]
一般にCCDセンサ等により画像をサンプリングして、
デジタル化したデータをインクジェットプリンタ等で出
力する画像処理装置は今後ますます普及する。[Prior art] Generally, images are sampled using a CCD sensor, etc.
Image processing devices that output digitized data using inkjet printers and the like will become increasingly popular in the future.
これらの装置では、入力センサとしては例えばA3版山
のCCDラインセンサが用いられ、出力素子には、ライ
ン状にノズルが並んだインクジェットヘッドが用いられ
る。In these devices, for example, an A3 size CCD line sensor is used as an input sensor, and an inkjet head in which nozzles are arranged in a line is used as an output element.
[発明が解決しようとしている問題点]しかしながら上
記従来例ではA3巾のCCDラインセンサの利得特性に
むらがあったり、出力側のインクジェットヘッドでもラ
イン方向に濃度のむらがあり、そのため、出力画像に濃
淡′のむらが発生し、画質を著しく劣化させていた。[Problems to be Solved by the Invention] However, in the conventional example described above, the gain characteristics of the A3-width CCD line sensor are uneven, and the inkjet head on the output side also has uneven density in the line direction, resulting in uneven shading in the output image. ′ unevenness occurred, significantly deteriorating the image quality.
[問題点を解決するための手段]
本発明によれば、二値化処理の誤差拡散法で、周囲画素
の二値化情報をたくわえ、それに拡散係数を掛ける回路
に、CCDラインセンサの利得むらの特性を係数として
保存する入力特性レジスタと、二値化処理中の画素がC
CDラインセンサのどこに対応するかを示すCCDカウ
ンタと、出力ヘッドの濃度むらの特性を係数として保存
する出力特性レジスタと、二値化処理中の画素がインク
ジェットヘットのどこに対応するかを示すカウンタとを
設け、拡散係数に、入力特性係数と出力特性係数をかけ
ることで、出力画像のむらを減少することができる。[Means for Solving the Problems] According to the present invention, in the error diffusion method of binarization processing, gain unevenness of the CCD line sensor is added to a circuit that stores binarized information of surrounding pixels and multiplies it by a diffusion coefficient. The input characteristic register stores the characteristics of as coefficients, and the pixel being binarized is C
A CCD counter that indicates where on the CD line sensor corresponds, an output characteristic register that stores density unevenness characteristics of the output head as a coefficient, and a counter that indicates where on the inkjet head the pixel being binarized corresponds. By setting , and multiplying the diffusion coefficient by the input characteristic coefficient and the output characteristic coefficient, it is possible to reduce the unevenness of the output image.
[実施例]
第1図は本発明による手法をブロック化したものである
。第1図において、16は二値化処理中の画素がライン
ヘッドのどこにくるかを示す出力カウンタ、17はライ
ンヘッドの特性に基づき係数を与えるヘッド特性レジス
タ、18は拡散係数をかける重み付は回路、19は二値
化後の誤差を保存するエラーバッファ、20は演算器、
21はしきい値とデータを比較する二値化回路、22は
出力バッファ、23はCCDセンサの利得特性を与える
COD入力特性レジスタ、24は二値化中の画素がCC
Dラインセンサのどこにくるかを示す入力カウンタであ
る。[Example] FIG. 1 is a block diagram of the method according to the present invention. In FIG. 1, 16 is an output counter that indicates where in the line head the pixel being binarized is located, 17 is a head characteristic register that provides a coefficient based on the characteristics of the line head, and 18 is a weighting that applies a diffusion coefficient. circuit; 19 is an error buffer for storing errors after binarization; 20 is an arithmetic unit;
21 is a binarization circuit that compares data with a threshold value, 22 is an output buffer, 23 is a COD input characteristic register that gives the gain characteristics of the CCD sensor, and 24 is a CC
This is an input counter that indicates where on the D line sensor.
重み付は係数の一例を第2図に示す。An example of weighting coefficients is shown in FIG.
入力CCDセンサが1mm当り16画素で210mmあ
ると、3360個のCCDセンサが一方向に並ぶ、この
特性を全く平坦にするのは困難で、例えば第3図(a)
のように入力特性にむらがある。出力側も同様に、イン
クジェットヘッドは例えば1本あたり128ノズル並ん
でいて、その濃度特性の一例を第4図(a)に示す。こ
れに対して、入力係数レジスタに第3図(b)、出力係
数レジスタに第4図(b)の特性を与える。If the input CCD sensor has 16 pixels per 1 mm and is 210 mm long, 3360 CCD sensors are lined up in one direction, and it is difficult to make this characteristic completely flat. For example, as shown in Figure 3 (a).
The input characteristics are uneven. Similarly, on the output side, each inkjet head has, for example, 128 nozzles lined up, and an example of the density characteristics is shown in FIG. 4(a). On the other hand, the characteristics shown in FIG. 3(b) are given to the input coefficient register, and the characteristics shown in FIG. 4(b) are given to the output coefficient register.
二(a 化の際に、入力係数レジスタは入力カウンタに
、出力係数レジスタは出力カウンタによって示される係
数を重み付は回路にわたし、従来の重み付は係数に前記
入力係数、出力係数を掛けることで、濃度むらが補正さ
れる。2(a) When converting, the input coefficient register passes the coefficient indicated by the input counter and the output coefficient register passes the coefficient indicated by the output counter to the weighting circuit, and conventional weighting is performed by multiplying the coefficient by the input coefficient and output coefficient. The density unevenness is corrected.
[他の実施例]
本発明は人出力の素子がライン状に並んでいるものであ
れば、その並ぶ向けには関係なく適用できる。[Other Embodiments] The present invention can be applied to any device in which human output elements are arranged in a line, regardless of the direction in which they are arranged.
[発明の効果]
以上のように、入力CCDラインセンサの利得むらと出
力インクジェットヘッドの濃度むらを誤差拡散法の重み
係数という形で補正してやることによって、出力画像の
むらをなくすことができる。[Effects of the Invention] As described above, by correcting the gain unevenness of the input CCD line sensor and the density unevenness of the output inkjet head in the form of weighting coefficients of the error diffusion method, it is possible to eliminate unevenness in the output image.
第1図は本発明のブロック図、 第2図は重み係数の一例図、 第3図は入力特性係数の一例図、 第4図は出力特性係数の一例図である。 FIG. 1 is a block diagram of the present invention, Figure 2 is an example of the weighting coefficient. Figure 3 is an example diagram of input characteristic coefficients, FIG. 4 is an example diagram of the output characteristic coefficients.
Claims (1)
その画像データを二値化し、ライン状に並んだノズルを
もつインクジェットプリンタに出力する画像処理方法に
おいて、前記CCDラインセンサの利得むらの特性を記
憶する入力特性レジスタと、二値化処理中の画素がCC
Dラインセンサのどこにくるかを示すCCDカウンタと
、前記インクジェットヘッドの濃度むらの特性を記憶す
る出力特性レジスタと、二値化処理中の画素が前記イン
クジェットヘッドの何番目のノズルに対応するかを計数
するカウンタをもち、各々ライン状に並んでいる入出力
素子の特性むらを、誤差拡散法の重み係数を補正するこ
とで改善する画像処理方法。Image data is input using CCD sensors arranged in a line,
In an image processing method that binarizes the image data and outputs it to an inkjet printer having nozzles arranged in a line, an input characteristic register that stores characteristics of gain unevenness of the CCD line sensor, and a pixel during the binarization process are provided. is CC
A CCD counter that indicates where on the D-line sensor it is located, an output characteristic register that stores the characteristics of density unevenness of the inkjet head, and an output characteristic register that stores the density unevenness characteristics of the inkjet head, and a nozzle number of the inkjet head that the pixel being binarized corresponds to. An image processing method that has a counter for counting and improves the uneven characteristics of input/output elements arranged in a line by correcting the weighting coefficients of the error diffusion method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63206138A JPH0254676A (en) | 1988-08-19 | 1988-08-19 | Picture processing method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63206138A JPH0254676A (en) | 1988-08-19 | 1988-08-19 | Picture processing method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0254676A true JPH0254676A (en) | 1990-02-23 |
Family
ID=16518415
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63206138A Pending JPH0254676A (en) | 1988-08-19 | 1988-08-19 | Picture processing method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0254676A (en) |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0591331A (en) * | 1991-02-22 | 1993-04-09 | American Teleph & Telegr Co <Att> | Image processing method and halftone image printing system |
JP2006043999A (en) * | 2004-08-03 | 2006-02-16 | Seiko Epson Corp | Method and system for setting correction value |
US7249820B2 (en) | 2003-11-07 | 2007-07-31 | Seiko Epson Corporation | Printing method, printing system, printing apparatus, print-control method, and storage medium |
US7347524B2 (en) | 2004-02-04 | 2008-03-25 | Seiko Epson Corporation | Printing method and printing apparatus |
EP1944170A2 (en) | 2007-01-15 | 2008-07-16 | Seiko Epson Corporation | Liquid ejecting method and liquid ejecting apparatus |
US7410235B2 (en) | 2004-02-16 | 2008-08-12 | Seiko Epson Corporation | Printing darkness non-uniformities correction method and printing darkness non-uniformities correction apparatus |
JP2008195312A (en) * | 2007-02-15 | 2008-08-28 | Mitsubishi Cable Ind Ltd | Grip member with electric heater |
US7556335B2 (en) | 2004-07-27 | 2009-07-07 | Seiko Epson Corporation | Print-control method, printing system, and print-control apparatus |
US7561304B2 (en) | 2005-11-29 | 2009-07-14 | Seiko Epson Corporation | Method of judging whether or not darkness of foreign matter has been read, method of calculating representative value of darkness of test pattern, and apparatus that judges whether or not darkness of foreign matter has been read |
US7568781B2 (en) | 2006-08-29 | 2009-08-04 | Seiko Epson Corporation | Printing method and printing apparatus |
US7661787B2 (en) | 2004-02-13 | 2010-02-16 | Seiko Epson Corporation | Printing method, computer-readable medium, printing apparatus, method of manufacturing printing apparatus, printing system, and correction pattern |
US7715069B2 (en) | 2005-04-28 | 2010-05-11 | Seiko Epson Corporation | Method for measuring density, printing method, method of calculating correction value, method of manufacturing printing apparatus and method for obtaining correction value |
US7726765B2 (en) | 2005-04-28 | 2010-06-01 | Seiko Epson Corporation | Printing method, storage medium, medium, printing apparatus, method for detecting end of image, method for detecting carrying unevenness of medium, and device for detecting carrying unevenness of medium |
US7787147B2 (en) | 2006-08-29 | 2010-08-31 | Seiko Epson Corporation | Printing method and apparatus correcting ink ejection in each row region using a combined correction value for certain coexistent row regions |
US7832826B2 (en) | 2006-08-29 | 2010-11-16 | Seiko Epson Corporation | Printing method and printing apparatus |
US7850275B2 (en) | 2006-08-25 | 2010-12-14 | Seiko Epson Corporation | Printing method, printing apparatus, and storage medium having program stored thereon with ink ejection amount correction |
US7862140B2 (en) | 2006-08-25 | 2011-01-04 | Seiko Epson Corporation | Printing method, printing apparatus, and storage medium having program stored thereon with ink ejection amount correction |
-
1988
- 1988-08-19 JP JP63206138A patent/JPH0254676A/en active Pending
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0591331A (en) * | 1991-02-22 | 1993-04-09 | American Teleph & Telegr Co <Att> | Image processing method and halftone image printing system |
US7249820B2 (en) | 2003-11-07 | 2007-07-31 | Seiko Epson Corporation | Printing method, printing system, printing apparatus, print-control method, and storage medium |
US7347524B2 (en) | 2004-02-04 | 2008-03-25 | Seiko Epson Corporation | Printing method and printing apparatus |
US7661787B2 (en) | 2004-02-13 | 2010-02-16 | Seiko Epson Corporation | Printing method, computer-readable medium, printing apparatus, method of manufacturing printing apparatus, printing system, and correction pattern |
US7410235B2 (en) | 2004-02-16 | 2008-08-12 | Seiko Epson Corporation | Printing darkness non-uniformities correction method and printing darkness non-uniformities correction apparatus |
US7556335B2 (en) | 2004-07-27 | 2009-07-07 | Seiko Epson Corporation | Print-control method, printing system, and print-control apparatus |
JP2006043999A (en) * | 2004-08-03 | 2006-02-16 | Seiko Epson Corp | Method and system for setting correction value |
JP4529577B2 (en) * | 2004-08-03 | 2010-08-25 | セイコーエプソン株式会社 | Correction value calculation method, printing method, program, correction controller, and correction value calculation system |
US7726765B2 (en) | 2005-04-28 | 2010-06-01 | Seiko Epson Corporation | Printing method, storage medium, medium, printing apparatus, method for detecting end of image, method for detecting carrying unevenness of medium, and device for detecting carrying unevenness of medium |
US7715069B2 (en) | 2005-04-28 | 2010-05-11 | Seiko Epson Corporation | Method for measuring density, printing method, method of calculating correction value, method of manufacturing printing apparatus and method for obtaining correction value |
US7561304B2 (en) | 2005-11-29 | 2009-07-14 | Seiko Epson Corporation | Method of judging whether or not darkness of foreign matter has been read, method of calculating representative value of darkness of test pattern, and apparatus that judges whether or not darkness of foreign matter has been read |
US7850275B2 (en) | 2006-08-25 | 2010-12-14 | Seiko Epson Corporation | Printing method, printing apparatus, and storage medium having program stored thereon with ink ejection amount correction |
US7862140B2 (en) | 2006-08-25 | 2011-01-04 | Seiko Epson Corporation | Printing method, printing apparatus, and storage medium having program stored thereon with ink ejection amount correction |
US7568781B2 (en) | 2006-08-29 | 2009-08-04 | Seiko Epson Corporation | Printing method and printing apparatus |
US7787147B2 (en) | 2006-08-29 | 2010-08-31 | Seiko Epson Corporation | Printing method and apparatus correcting ink ejection in each row region using a combined correction value for certain coexistent row regions |
US7832826B2 (en) | 2006-08-29 | 2010-11-16 | Seiko Epson Corporation | Printing method and printing apparatus |
EP1944170A2 (en) | 2007-01-15 | 2008-07-16 | Seiko Epson Corporation | Liquid ejecting method and liquid ejecting apparatus |
US8033630B2 (en) | 2007-01-15 | 2011-10-11 | Seiko Epson Corporation | Liquid ejecting method and liquid ejecting apparatus |
JP2008195312A (en) * | 2007-02-15 | 2008-08-28 | Mitsubishi Cable Ind Ltd | Grip member with electric heater |
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