JPS57174984A - Encoding and decoding system for halftone fascimile signal - Google Patents
Encoding and decoding system for halftone fascimile signalInfo
- Publication number
- JPS57174984A JPS57174984A JP56059505A JP5950581A JPS57174984A JP S57174984 A JPS57174984 A JP S57174984A JP 56059505 A JP56059505 A JP 56059505A JP 5950581 A JP5950581 A JP 5950581A JP S57174984 A JPS57174984 A JP S57174984A
- Authority
- JP
- Japan
- Prior art keywords
- gradation
- encoder
- information
- picture
- picture element
- 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 obtain picture element information which corresponds to a picture element having a mean gradation by encoding and decoding pieces of picture element information by dividing a halftone signal into blocks of picture elements, and representing the gradation of each block by plural kinds of gradation information and picture element information showing resolution. CONSTITUTION:An encoder consists of a circuit 1 which separates gradation information and picture element information, a binary signal encoder 2, a gradation information encoder 3, a multiplexer part 4, etc., and the circuit 1 divides a halftone fascimile signal into blocks having sides each consisting of N pieces of picture elements. A picture- element information signal 6 separated by the circuit 1 is applied to the encoder 2, and a gradation information signal 7 is applied to and encoded by the encoder 3 to output encoded gradation data 9. The data 9 and picture-element information encoded data 8 from the encoder 2 are applied to the multiplexer part 4, and the data 8 and 9 are switched alternately by a flag for switching to output halftone encoded data 10. A decoder having constitution reverse of that of the decoder decodes the data 10 to find picture element information which corresponds to a picture element having a mean gradation.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56059505A JPS57174984A (en) | 1981-04-20 | 1981-04-20 | Encoding and decoding system for halftone fascimile 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 |
---|---|---|---|
JP56059505A JPS57174984A (en) | 1981-04-20 | 1981-04-20 | Encoding and decoding system for halftone fascimile signal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57174984A true JPS57174984A (en) | 1982-10-27 |
Family
ID=13115183
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56059505A Pending JPS57174984A (en) | 1981-01-31 | 1981-04-20 | Encoding and decoding system for halftone fascimile signal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57174984A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61269466A (en) * | 1985-05-22 | 1986-11-28 | Nippon Telegr & Teleph Corp <Ntt> | Encoding system |
DE4127920A1 (en) * | 1990-08-23 | 1992-04-09 | Fuji Xerox Co Ltd | IMAGE CODING DEVICE |
-
1981
- 1981-04-20 JP JP56059505A patent/JPS57174984A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61269466A (en) * | 1985-05-22 | 1986-11-28 | Nippon Telegr & Teleph Corp <Ntt> | Encoding system |
DE4127920A1 (en) * | 1990-08-23 | 1992-04-09 | Fuji Xerox Co Ltd | IMAGE CODING DEVICE |
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