JPS6477371A - Halftone image coding system using dither system - Google Patents
Halftone image coding system using dither systemInfo
- Publication number
- JPS6477371A JPS6477371A JP62234126A JP23412687A JPS6477371A JP S6477371 A JPS6477371 A JP S6477371A JP 62234126 A JP62234126 A JP 62234126A JP 23412687 A JP23412687 A JP 23412687A JP S6477371 A JPS6477371 A JP S6477371A
- Authority
- JP
- Japan
- Prior art keywords
- binary pattern
- dither
- coding
- code
- discrepancy
- 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
Abstract
PURPOSE:To increase the efficiency of coding without reducing picture quality by comparing a binary pattern obtained by binarizing processing using a systematic dither method of a halftone image with a previously processed binary pattern and coding only their difference. CONSTITUTION:For instance, a Bayer type dither matrix is prepared in a dither processing circuit 2, the n-th half tone image is inputted and the binarizing processing of the input is executed by the systematic dither method. The n-th binary pattern is compared with the (n-1)th binary pattern processed in the precedent time. When the n-th binary pattern is the same as the (n-1)th binary pattern, a coding circuit 5 adds a coincidence code E and counts only 'the number of times of coincidence +1'. The counted contents are stored in the succeeding code memory 6. When both the patterns are different from each other, a discrepancy code B is added and the discrepancy position is coded correspondingly to a discrepancy position address and stored in the memory 6.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62234126A JPS6477371A (en) | 1987-09-18 | 1987-09-18 | Halftone image coding system using dither system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62234126A JPS6477371A (en) | 1987-09-18 | 1987-09-18 | Halftone image coding system using dither system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6477371A true JPS6477371A (en) | 1989-03-23 |
Family
ID=16966042
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62234126A Pending JPS6477371A (en) | 1987-09-18 | 1987-09-18 | Halftone image coding system using dither system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6477371A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002314821A (en) * | 2001-04-18 | 2002-10-25 | Ricoh Co Ltd | Image compression method, image expansion method, image compression device, and image expansion device |
US7277585B2 (en) | 2001-05-25 | 2007-10-02 | Ricoh Company, Ltd. | Image encoding method, image encoding apparatus and storage medium |
-
1987
- 1987-09-18 JP JP62234126A patent/JPS6477371A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002314821A (en) * | 2001-04-18 | 2002-10-25 | Ricoh Co Ltd | Image compression method, image expansion method, image compression device, and image expansion device |
US7277585B2 (en) | 2001-05-25 | 2007-10-02 | Ricoh Company, Ltd. | Image encoding method, image encoding apparatus and storage medium |
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