JPS57181270A - Encoding system for binary picture signal - Google Patents
Encoding system for binary picture signalInfo
- Publication number
- JPS57181270A JPS57181270A JP57062432A JP6243282A JPS57181270A JP S57181270 A JPS57181270 A JP S57181270A JP 57062432 A JP57062432 A JP 57062432A JP 6243282 A JP6243282 A JP 6243282A JP S57181270 A JPS57181270 A JP S57181270A
- Authority
- JP
- Japan
- Prior art keywords
- pattern
- equal
- counter
- threshold value
- value
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/41—Bandwidth or redundancy reduction
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
Abstract
PURPOSE:To encode a dither picture signal high efficiently when a specific pattern of white and black picture elements are generated, by encoding a mode code for displaying this pattern, times of the successive generation of the pattern. CONSTITUTION:An original 1 is read by a sensor 3, whose output is stored in a line memory 4. Then, an encoding circuit 5 reads out a picture element signal out of the line memory 4 to count the continuation length (RL) of white or black picture elements, and a comparator 8 detects whether the RL is equal to 1 or 3. When the RL is equal to 1 or 3, the RL before the preceding one, delayed by two stages of delay elements 9 is compared with the current RL by a coincidence circuit 10. When the both are equal, an identical-pattern continuation counter 11 goes up by one. When not, the value of the counter 11 is compared by the 1st threshold value comparator 12 with some threshold value and when it is greater than the threshold value, namely, when the same pattern continues long, a mode code for the same pattern and the value of the counter 11 are encoded and sent out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57062432A JPS57181270A (en) | 1982-04-16 | 1982-04-16 | Encoding system for binary picture signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57062432A JPS57181270A (en) | 1982-04-16 | 1982-04-16 | Encoding system for binary picture signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57181270A true JPS57181270A (en) | 1982-11-08 |
| JPH041552B2 JPH041552B2 (en) | 1992-01-13 |
Family
ID=13200008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57062432A Granted JPS57181270A (en) | 1982-04-16 | 1982-04-16 | Encoding system for binary picture signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57181270A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS605671A (en) * | 1983-06-24 | 1985-01-12 | Canon Inc | Picture processing device |
| JPS61245768A (en) * | 1985-04-22 | 1986-11-01 | インタ−ナショナル ビジネス マシ−ンズ コ−ポレ−ション | Encoding of image data |
| US7277585B2 (en) | 2001-05-25 | 2007-10-02 | Ricoh Company, Ltd. | Image encoding method, image encoding apparatus and storage medium |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5040015A (en) * | 1973-07-16 | 1975-04-12 |
-
1982
- 1982-04-16 JP JP57062432A patent/JPS57181270A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5040015A (en) * | 1973-07-16 | 1975-04-12 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS605671A (en) * | 1983-06-24 | 1985-01-12 | Canon Inc | Picture processing device |
| JPS61245768A (en) * | 1985-04-22 | 1986-11-01 | インタ−ナショナル ビジネス マシ−ンズ コ−ポレ−ション | Encoding of image data |
| US7277585B2 (en) | 2001-05-25 | 2007-10-02 | Ricoh Company, Ltd. | Image encoding method, image encoding apparatus and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH041552B2 (en) | 1992-01-13 |
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