JPS57127363A - Coding system of halftone facsimile signal - Google Patents
Coding system of halftone facsimile signalInfo
- Publication number
- JPS57127363A JPS57127363A JP56012233A JP1223381A JPS57127363A JP S57127363 A JPS57127363 A JP S57127363A JP 56012233 A JP56012233 A JP 56012233A JP 1223381 A JP1223381 A JP 1223381A JP S57127363 A JPS57127363 A JP S57127363A
- Authority
- JP
- Japan
- Prior art keywords
- gradation
- information
- picture element
- block
- coding
- 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
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
- H04N1/4105—Bandwidth or redundancy reduction for halftone screened pictures
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
Abstract
PURPOSE:To increase the coding efficiency, by applying a binary coding system using the correlation of the inter-block gradation for the gradation information to the picture element information. CONSTITUTION:A halftone facsimile signal 5 is divided into the blocks comprising several picture elements and then separated 1 into the gradation information representing the gradation of the blocks and the picture element information showing the image resolution to perform the coding 2 and 3. In this case, a picture element having the same gradation as the mean gradation of the block is categorized to the lighter gradation information, and the mean gradation of the block is used as the only gradation information in case the gradation is substantially even within the block. Then the picture element information equivalent to the picture element showing the mean gradation is formed to all picture elements. After this, the picture element information is binary code 2, and at the same time the gradation information is coded 3 with a flag showing that the gradation of the block to be coded is equal to the gradation of the same kind that emerges immediately before. Otherwise the coding 3 is carried out with use of the flag and the gradation information.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56012233A JPS57127363A (en) | 1981-01-31 | 1981-01-31 | Coding system of halftone facsimile signal |
US06/342,548 US4409623A (en) | 1981-01-31 | 1982-01-25 | Method and equipment for processing gray scale facsimile signal |
FR8201450A FR2499794B1 (en) | 1981-01-31 | 1982-01-29 | GRAY SCALE FACSIMILE SIGNAL PROCESSING METHOD AND EQUIPMENT |
DE3202913A DE3202913C2 (en) | 1981-01-31 | 1982-01-29 | Method and apparatus for processing a facsimile signal containing gray scale components |
GB8202677A GB2092416B (en) | 1981-01-31 | 1982-01-29 | Method and equipment for processing gray scale facsimile signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56012233A JPS57127363A (en) | 1981-01-31 | 1981-01-31 | Coding system of halftone facsimile signal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57127363A true JPS57127363A (en) | 1982-08-07 |
Family
ID=11799646
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56012233A Pending JPS57127363A (en) | 1981-01-31 | 1981-01-31 | Coding system of halftone facsimile signal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57127363A (en) |
-
1981
- 1981-01-31 JP JP56012233A patent/JPS57127363A/en active Pending
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