JPS6373773A - Picture processor - Google Patents

Picture processor

Info

Publication number
JPS6373773A
JPS6373773A JP61217786A JP21778686A JPS6373773A JP S6373773 A JPS6373773 A JP S6373773A JP 61217786 A JP61217786 A JP 61217786A JP 21778686 A JP21778686 A JP 21778686A JP S6373773 A JPS6373773 A JP S6373773A
Authority
JP
Japan
Prior art keywords
data
picture
tables
color
color correction
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
Application number
JP61217786A
Other languages
Japanese (ja)
Inventor
Satoru Ito
悟 伊藤
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 JP61217786A priority Critical patent/JPS6373773A/en
Publication of JPS6373773A publication Critical patent/JPS6373773A/en
Pending legal-status Critical Current

Links

Landscapes

  • Color Image Communication Systems (AREA)

Abstract

PURPOSE:To attain a color correction of high level, a compact device and a low cost by compressing input data and then converting a density and performing the color correction. CONSTITUTION:The three color input data is picture data of R, G, B or 8 bits, respectively, respectively converted by data converting tables 1-3 and compressed to the data of 4 bits. The data is converted by data converting tables 4-6 to execute the density conversion and the color correction according to a masking equation and have the picture data of Y, M, C. In the data converting tables 1-6, a ROM is used, and a RAM may be used, in this case externally, when the contents of the RAM are rewritten by a personal computer or the like, the contents of the data compression tables 1-3 can be changed according to the property of a picture and the picture of high quality can be obtained.

Description

【発明の詳細な説明】 （技術分野） 本発明はカラープリンタ、カラー複写機、カラーファク
シミリ、カラーディスプレイなどに用いられる画像処理
装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an image processing apparatus used in color printers, color copying machines, color facsimiles, color displays, and the like.

（従来の技ｖ／Ｉ） 従来画像処理装置はＲ，Ｇ、Ｂ　（赤、緑、青）の３色
の入力データをマスキング方程式により処理してハイラ
イト強調等の濃度変換及び色補正を行ないｙ、Ｍ、ｃ（
イエロー、マゼンタ、シアン）の３色データを得ている
。(Conventional technique v/I) Conventional image processing devices process input data of three colors, R, G, and B (red, green, and blue) using masking equations to perform density conversion and color correction such as highlight emphasis. y, M, c(
Three color data (yellow, magenta, cyan) is obtained.

しかしこの画像処理装置ではビット数の多い入力データ
をそのまま処理するので、装置が大型で高価になる。However, since this image processing device processes input data with a large number of bits as is, the device becomes large and expensive.

（目　　的） 本発明は上記欠点を改善し、小型化及び低価格化を計る
ことができる画像処理装置を提供することを目的とする
。(Objective) It is an object of the present invention to provide an image processing device that can improve the above-mentioned drawbacks and can be made smaller and lower in price.

（構　　成） 本発明は入力データを圧縮するデータ圧縮手段を設けた
ものであり、データ圧縮手段で圧縮したデータについて
濃度変換及び色補正を行う。(Structure) The present invention is provided with a data compression means for compressing input data, and performs density conversion and color correction on the data compressed by the data compression means.

以下図面を参照しながら本発明の実施例について説明す
る。Embodiments of the present invention will be described below with reference to the drawings.

第１図は本発明の一実施例を示す。FIG. 1 shows an embodiment of the invention.

３色の入力データは８ビツトずつのＲ，Ｇ、Ｂの画像デ
ータであり、データ変換テーブル１〜３によりそれぞれ
データ変換されて４ビツトのデータに圧縮される。この
データはデータ変換テーブル４〜６にてデータ変換され
てマスキング方程式による濃度変換及び色補正が行なわ
れ、Ｙ、Ｍ。The three-color input data is R, G, and B image data of 8 bits each, which are each converted by data conversion tables 1 to 3 and compressed into 4-bit data. This data is converted using data conversion tables 4 to 6, and subjected to density conversion and color correction using masking equations.

Ｃの画像データとなる。データ変換テーブル１〜６はリ
ードオンリーメモリが用いられているが。This becomes the image data of C. Read-only memory is used for data conversion tables 1 to 6.

ランダムアクセスメモリ（ＲＡＭ）を用いることもでき
、その場合外部からパーソナルコンピュータ等でＲＡＭ
の内容を書き換えれば画像の性質によりデータ圧縮テー
ブル１〜３の内容も変えることができ高＠質の画像を得
ることが可能となる。Random access memory (RAM) can also be used, in which case the RAM can be accessed externally by a personal computer, etc.
By rewriting the contents of , the contents of data compression tables 1 to 3 can be changed depending on the nature of the image, making it possible to obtain high quality images.

第２図〜第５図は８ビツトの入力データをデータ変換テ
ーブル１〜３により４ビツトのデータに圧縮する場合に
おけるデータ圧縮特性の各側を示す、なおこのデータ圧
縮は入力データのビット数を任意のビット数に減らすよ
うにしてもよい。Figures 2 to 5 show each side of the data compression characteristics when 8-bit input data is compressed to 4-bit data using data conversion tables 1 to 3. It may be reduced to an arbitrary number of bits.

（効　　果） 以上のように本発明によれば入力データを圧縮してから
濃度変換及び色補正を行うので、高次の色補正が可能に
なるとともに、装置を小型で安価に実現することができ
る。(Effects) As described above, according to the present invention, density conversion and color correction are performed after input data is compressed, making it possible to perform high-order color correction and to realize a device that is small and inexpensive. can.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例を示すブロック図、第２図乃
至第５図はデータ圧縮特性の各側を示す特性曲線図であ
る。 １〜６・・・・データ変換テーブル。FIG. 1 is a block diagram showing one embodiment of the present invention, and FIGS. 2 to 5 are characteristic curve diagrams showing each side of data compression characteristics. 1 to 6...Data conversion table.

Claims (1)

【特許請求の範囲】[Claims] ３色の入力データを圧縮するデータ圧縮手段と、このデ
ータ圧縮手段で圧縮した３色のデータの濃度変換及び色
補正を行う手段とを備えたことを特徴とする画像処理装
置。An image processing apparatus comprising: a data compression means for compressing three-color input data; and a means for performing density conversion and color correction on the three-color data compressed by the data compression means.
JP61217786A 1986-09-16 1986-09-16 Picture processor Pending JPS6373773A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61217786A JPS6373773A (en) 1986-09-16 1986-09-16 Picture processor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61217786A JPS6373773A (en) 1986-09-16 1986-09-16 Picture processor

Publications (1)

Publication Number Publication Date
JPS6373773A true JPS6373773A (en) 1988-04-04

Family

ID=16709702

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61217786A Pending JPS6373773A (en) 1986-09-16 1986-09-16 Picture processor

Country Status (1)

Country Link
JP (1) JPS6373773A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0390055A2 (en) * 1989-03-28 1990-10-03 Konica Corporation Color image processing apparatus with digital color signal compression means
US6134025A (en) * 1988-09-08 2000-10-17 Canon Kabushiki Kaisha Dot image data output apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6134025A (en) * 1988-09-08 2000-10-17 Canon Kabushiki Kaisha Dot image data output apparatus
EP0390055A2 (en) * 1989-03-28 1990-10-03 Konica Corporation Color image processing apparatus with digital color signal compression means

Similar Documents

Publication Publication Date Title
US6377355B1 (en) Color gamut displaying method, an image processing method, and apparatus utilizing these methods
EP0487304B1 (en) Color image processing
US6781716B1 (en) Color conversion method, color conversion apparatus, and color conversion definition storage medium
JPH06501144A (en) How to display multitone images
JPH1084487A (en) Image processor and its method
JP2647033B2 (en) Lookup table creation method and lookup table creation device
JPS61214862A (en) Color image forming method
JPS6373773A (en) Picture processor
CA2074781A1 (en) Method for amending color nonuniformity of color images
US4974070A (en) Colorgraphic reproduction system
JPH06121160A (en) Color correction circuit
JPH09224162A (en) Chrominance converter
JP3721895B2 (en) Image conversion method
JPH05284347A (en) Color picture output device
JP2000341550A5 (en)
JP2740516B2 (en) Image processing device
JP2987393B2 (en) Color image processing method
JPS5938873A (en) Color data compressing device
JPH04181872A (en) Color picture processing unit
JPH0690351A (en) Color compression system for color picture
JP3053425B2 (en) Image recording device
JPS6233421Y2 (en)
JPH04181870A (en) Color picture processing unit
JPH0950518A (en) Method for processing color picture
JPH07250253A (en) Image signal converting device