JPS63152355U - - Google Patents
Info
- Publication number
- JPS63152355U JPS63152355U JP15068087U JP15068087U JPS63152355U JP S63152355 U JPS63152355 U JP S63152355U JP 15068087 U JP15068087 U JP 15068087U JP 15068087 U JP15068087 U JP 15068087U JP S63152355 U JPS63152355 U JP S63152355U
- Authority
- JP
- Japan
- Prior art keywords
- prediction error
- outputting
- target pixel
- code
- code according
- 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
- 230000007704 transition Effects 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 1
Landscapes
- Facsimile Image Signal Circuits (AREA)
Description
第１図は網点画像を得る装置構成図、第２図イ
は原画像のサンプリング点を示す図、第２図ロは
メモリのデータを示す図、第３図は網点画像を示
す図、第４図は予測誤差を求める方法の説明図、
第５図は本考案の一実施例回路構成図、第６図〜
第１１図は第５図の装置の動作説明図である。
Ｒ１〜Ｒ３；シフトレジスタ、Ｐ；演算回路、
Ｓ；減算器、Ｃ；比較器、Ｌ；ランレングス回路
、Ｆ；予測誤差符号化回路、Ｍ；モード遷移符号
化回路、Ｗ；セレクタ。
1 is a diagram showing the configuration of an apparatus for obtaining a halftone image, FIG. 2A is a diagram showing sampling points of the original image, FIG. 2B is a diagram showing memory data, FIG. 3 is a diagram showing a halftone image Figure 4 is an explanatory diagram of the method for calculating the prediction error.
Fig. 5 is a circuit configuration diagram of an embodiment of the present invention, Fig. 6~
FIG. 11 is an explanatory diagram of the operation of the apparatus shown in FIG. 5. R1 to R3 ; shift register; P; arithmetic circuit;
S: subtractor, C: comparator, L: run length circuit, F: prediction error encoding circuit, M: mode transition encoding circuit, W: selector.
Claims (1)
の周辺画素の光学濃度により該対象画素の予測値
を発生する演算手段と、該対象画素の光学濃度と
該予測値との差から予測誤差Ａを求める減算手段
と、該予測誤差Ａと該網点の１つ前の予測誤差Ｂ
の差が０のパルスをカウントするカウンタ手段と
、該カウンタの計数値に応じランレングス符号を
出力する手段と、該予測誤差Ａの正負に応じて予
測誤差符号を出力する誤差符号化手段と、該予測
誤差Ａと予測誤差Ｂに応じて遷移コードを出力す
るモード遷移符号化手段と、ランレングス符号、
予測誤差符号、遷移コードを選択的に出力する手
段とを備えることを特徴とする画像データ処理装
置。 calculation means for generating a predicted value of the target pixel based on the optical density of surrounding pixels of the target pixel in a halftone image obtained by sampling the original image, and calculating a prediction error A from the difference between the optical density of the target pixel and the predicted value. a subtraction means, the prediction error A and the prediction error B immediately before the halftone dot;
a counter means for counting pulses with a difference of 0; means for outputting a run-length code according to the count value of the counter; and an error encoding means for outputting a prediction error code according to the sign of the prediction error A. mode transition encoding means for outputting a transition code according to the prediction error A and the prediction error B; a run-length code;
An image data processing device comprising means for selectively outputting a prediction error code and a transition code.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15068087U JPH0127320Y2 (en) | 1987-10-01 | 1987-10-01 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15068087U JPH0127320Y2 (en) | 1987-10-01 | 1987-10-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63152355U true JPS63152355U (en) | 1988-10-06 |
| JPH0127320Y2 JPH0127320Y2 (en) | 1989-08-15 |
Family
ID=31067036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15068087U Expired JPH0127320Y2 (en) | 1987-10-01 | 1987-10-01 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0127320Y2 (en) |
-
1987
- 1987-10-01 JP JP15068087U patent/JPH0127320Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0127320Y2 (en) | 1989-08-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS6095721U (en) | electronic volume circuit | |
| JPS63152355U (en) | ||
| JPS5839345B2 (en) | Arithmetic mask device | |
| JPS5813066A (en) | Picture size contracting system | |
| JPH01303578A (en) | Picture converting device | |
| JPH067644Y2 (en) | Printing equipment | |
| JPS6318383B2 (en) | ||
| JPS5914605U (en) | X-ray CT device | |
| JPS59114679U (en) | video environment monitoring equipment | |
| JP2625854B2 (en) | Matte color effect generator | |
| JP2725286B2 (en) | Facsimile signal processing circuit | |
| JPS58105651U (en) | Pattern center position detection device | |
| JPS6151554U (en) | ||
| JPH01151657U (en) | ||
| KR100186226B1 (en) | White line expressivity improving circuit of image forming apparatus | |
| JPH0984026A (en) | Outline encoding device | |
| JPS6132653A (en) | Picture inputting device | |
| JPS5911068A (en) | System for converting resolution adaptive to density of information | |
| JPH0514207B2 (en) | ||
| JPH0323366U (en) | ||
| JPS62147975U (en) | ||
| JPS5820063A (en) | Picture processor | |
| JPS5745773A (en) | Facsimile device | |
| JPH0444771U (en) | ||
| JPS6235776A (en) | Decoding device for image code |