JPS6345989A - Color image processing method - Google Patents
Color image processing methodInfo
- Publication number
- JPS6345989A JPS6345989A JP61189331A JP18933186A JPS6345989A JP S6345989 A JPS6345989 A JP S6345989A JP 61189331 A JP61189331 A JP 61189331A JP 18933186 A JP18933186 A JP 18933186A JP S6345989 A JPS6345989 A JP S6345989A
- Authority
- JP
- Japan
- Prior art keywords
- white balance
- converted
- density
- image processing
- rgb signal
- 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
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 238000010586 diagram Methods 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
Landscapes
- Processing Of Color Television Signals (AREA)
- Color Image Communication Systems (AREA)
- Color Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】 く技術分野〉 本発明はカラー画像処理方法に関する。[Detailed description of the invention] Technical fields> The present invention relates to a color image processing method.
〈従来技術〉
従来、一般にビデオプリンタ等には自動ホワイトバラン
スの機能をもっておらず、画面のホワイトバランスがく
ずれたものが人力された場合には、人間が色相調整ダイ
ヤル等を操作し、目で見て自然な色彩再現が得られるよ
うに調整する必要があった。<Prior art> Conventionally, video printers generally do not have an automatic white balance function, and if the white balance of the screen is out of order, a person must operate the hue adjustment dial, etc. to visually check the white balance. It was necessary to make adjustments to obtain natural color reproduction.
〈目 的〉
本発明はたとえホワイトバランスがくすれたような画像
信号か人力されても、自動的にホワイトバランスをとり
、良好な色再現性の得られるカラー画像処理方法を提供
するものである。<Objective> The present invention provides a color image processing method that automatically maintains white balance and provides good color reproducibility even if an image signal with a distorted white balance is manually input.
〈実施例〉
第1図に本発明の第1の実施例としてインクジェットプ
リンタを示す。<Embodiment> FIG. 1 shows an inkjet printer as a first embodiment of the present invention.
画素ごとの人力RGB信号はA/D変換器1゜でA/D
変換されてディジタルのRGB信号に変換される。実際
のプリントに先立って全画面のスキャンが行なわれ、す
へての画素又は適当な間隔で間引いた画素のRGB信号
はマイクロコンピュータ(M−COM)20に人力され
る。The human RGB signal for each pixel is A/D converter 1°.
It is converted into a digital RGB signal. Prior to actual printing, the entire screen is scanned, and the RGB signals of all pixels or pixels thinned out at appropriate intervals are manually input to a microcomputer (M-COM) 20.
M−C0M20では、これらのデータからRGB信号の
各々最大値、最小値R+a a M + Rwh l
n +G wax 、Ga1n + Bmax +
Bm+。を決定する。In M-C0M20, from these data, each maximum value and minimum value of RGB signals R+a a M + Rwh l
n + G wax , Ga1n + Bmax +
Bm+. Determine.
これらの値は例えは4ビツトで量子化され、各々の色の
濃度変換ROM30R,30G。These values are quantized with 4 bits, for example, and are stored in the density conversion ROMs 30R and 30G for each color.
30Bのアドレスとして人力される。It is entered manually as a 30B address.
濃度変換ROMには予め次のようなデータか書き込まれ
ている。The following data is written in the density conversion ROM in advance.
すなわち、各色出力の最大値、最小値はホワイトバラン
スかとられた状態では一致すると考えられるために、例
えはR′
のように変換する必要がある。That is, since the maximum and minimum values of each color output are considered to match when white balance is taken, it is necessary to convert, for example, R'.
その後、濃度に変換するので出力を8ビツトとすると、
C=−255XlogR′ 1≧R′≧O1=
255 0.1≧R′となる。従っ
て変換後の濃度CはR′、RmaX。After that, it is converted to density, so if the output is 8 bits, C=-255XlogR'1≧R'≧O1=
255 0.1≧R'. Therefore, the concentration C after conversion is R', RmaX.
Rm l nて一意に決まる。GやBについても同様で
ある。Rm ln is uniquely determined. The same applies to G and B.
以上のように濃度に変換された信号は、マスキング部4
0でインクの不斉色成分をとりのぞかれ、C′、lvf
、Y′に変換され、その後に濃度−電圧変換テーブル5
0て各色ヘット60C,60M。The signal converted into density as described above is sent to the masking unit 4.
0 removes the asymmetric color component of the ink, C', lvf
, Y', and then the concentration-voltage conversion table 5
0 and each color head 60C, 60M.
60Yを駆動すべき電圧VC9VM、V、、へ変換され
る。60Y is converted into the voltage VC9VM, V, to drive it.
第2図に本発明の第2の実施例について説明する。A second embodiment of the present invention will be explained in FIG.
第1図と同しようにR,G、Bのデータはプリントに先
立ってスキャンされ、M −COM 20’にとりこま
れ、各色の最大値RmaX + G max +B m
axか決定される。As in Fig. 1, R, G, and B data are scanned prior to printing and taken into M-COM 20', and the maximum value of each color Rmax + Gmax +Bm
ax is determined.
これらの値は例えは4ビツトで量子化されて濃度変換R
OM30’R,3σG、30’Bのアドレスに人力され
る。For example, these values are quantized using 4 bits and converted into density R.
The addresses of OM30'R, 3σG, and 30'B are entered manually.
濃度変換には予め次のようなデータが書き込まれている
。The following data is written in advance for density conversion.
すなわち、例えはRは8ヒツトとすればR′= R+
(255RM )
となる。これより、その補色濃度Cは
C=−1ngR′
となり、RとRMにより一意に決定できる。この場合は
パラメータか最大値だけなので、第1図の場合と比へて
ROM容量が縮少できる。That is, for example, if R is 8 hits, then R'= R+
(255RM). From this, the complementary color density C becomes C=-1ngR', which can be uniquely determined by R and RM. In this case, since there are only parameters or maximum values, the ROM capacity can be reduced compared to the case of FIG.
またR□8のかわりにR1nのみを検出し、R′=RR
m + n
のようにしてもよい。Also, only R1n is detected instead of R□8, and R'=RR
It may be set as m + n.
く効 果〉
以上のように、本発明によればホワイトバランスかずれ
ているような人力画像に対しても自動的にホワイトバラ
ンスを調整するので簡単に色再現性の良い出力画像か得
られる。Effects> As described above, according to the present invention, since the white balance is automatically adjusted even for a manually generated image in which the white balance is out of alignment, an output image with good color reproducibility can be easily obtained.
第1図は第1の実施例の画像処理ブロック図、第2図は
第2の実施例の画像処理ブロック図である。FIG. 1 is an image processing block diagram of the first embodiment, and FIG. 2 is an image processing block diagram of the second embodiment.
Claims (1)
とも一方を用いて、R、G、Bの階調変換特性を変化さ
せるホワイトバランス調整することを特徴とするカラー
画像処理方法。A color image processing method characterized in that white balance adjustment is performed by using at least one of a maximum value or a minimum value of input three primary color signals R, G, and B to change tone conversion characteristics of R, G, and B.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61189331A JPS6345989A (en) | 1986-08-12 | 1986-08-12 | Color image processing method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61189331A JPS6345989A (en) | 1986-08-12 | 1986-08-12 | Color image processing method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6345989A true JPS6345989A (en) | 1988-02-26 |
Family
ID=16239559
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61189331A Pending JPS6345989A (en) | 1986-08-12 | 1986-08-12 | Color image processing method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6345989A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5981992A (en) * | 1982-11-02 | 1984-05-11 | Canon Inc | Color image pickup device |
JPS61101188A (en) * | 1984-10-23 | 1986-05-20 | Matsushita Electric Ind Co Ltd | Color television camera |
-
1986
- 1986-08-12 JP JP61189331A patent/JPS6345989A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5981992A (en) * | 1982-11-02 | 1984-05-11 | Canon Inc | Color image pickup device |
JPS61101188A (en) * | 1984-10-23 | 1986-05-20 | Matsushita Electric Ind Co Ltd | Color television camera |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP2887158B2 (en) | Image processing device | |
JP3011432B2 (en) | Color image processing equipment | |
US5369510A (en) | Image processing with controlled under color removal | |
JPH04277974A (en) | Color component signal processing method for regenerating color image | |
JP2936080B2 (en) | Video signal color correction device | |
US4551751A (en) | Color reduction dependent on tone | |
JPH065875B2 (en) | Method and apparatus for image correction | |
US4965664A (en) | Color image signal processing method and apparatus for recording a color image from input color image signals by converting an individual color signal component | |
JPH0736609B2 (en) | Under color removal method of color image forming apparatus | |
JP2005124172A (en) | Image forming method and system for monochromatic reproduction of color image | |
JPS61214862A (en) | Color image forming method | |
JPH05103336A (en) | Color video signal processing device and color correcting method for color video signal | |
KR890017580A (en) | How to adjust saturation | |
JPH1075374A (en) | Image processing unit and its method | |
JPS6345989A (en) | Color image processing method | |
JPS61214893A (en) | Color picture processing method | |
JP2961719B2 (en) | Image signal processing circuit | |
JPS60216352A (en) | Automatic setting method of color correction condition | |
JP2567216B2 (en) | Color image signal processing method | |
JPH07203231A (en) | Color picture processor | |
JP2527715B2 (en) | Image processing method | |
JP3121026B2 (en) | Color image processing equipment | |
JPS60216351A (en) | Automatic setting method of gradation processing condition | |
JPH03234178A (en) | Picture input device | |
JPH0548657B2 (en) |