JPS57147376A - Picture discriminating method - Google Patents
Picture discriminating methodInfo
- Publication number
- JPS57147376A JPS57147376A JP56032278A JP3227881A JPS57147376A JP S57147376 A JPS57147376 A JP S57147376A JP 56032278 A JP56032278 A JP 56032278A JP 3227881 A JP3227881 A JP 3227881A JP S57147376 A JPS57147376 A JP S57147376A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- dither
- picture
- density
- binary 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
- H04N1/40—Picture signal circuits
- H04N1/40062—Discrimination between different image types, e.g. two-tone, continuous tone
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimiles In General (AREA)
- Facsimile Image Signal Circuits (AREA)
- Image Analysis (AREA)
Abstract
PURPOSE:To discriminate a half tone region in real time, by carrying out a dither process and a simple binary coding process individually for a multivalue digital picture, obtaining the mean value of the preprocess density for the picture elements which are decided black and white through the above-mentioned processes and using these mean values. CONSTITUTION:Input picture data is supplied to a shift register 101 at the highest stage of an input buffer 100, a simple binary coding circuit 105, a dither circuit 106 plus multiplexers 107 and 108, respectively. The circuit 105 compares the level of density of the picture element to be supplied with the set threshold value. The circuit 106 compares the above-mentioned level of concentration with the corresponding element within a dither matrix. Then the mean value of the preprocess density is obtained for the picture elements which are decided black and white each through the dither and simple binary coding processes. Based on these values, a deciding circuit 121 decides whether or not each mesh region is equal to a half tone region.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56032278A JPS57147376A (en) | 1981-03-06 | 1981-03-06 | Picture discriminating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56032278A JPS57147376A (en) | 1981-03-06 | 1981-03-06 | Picture discriminating method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57147376A true JPS57147376A (en) | 1982-09-11 |
Family
ID=12354504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56032278A Pending JPS57147376A (en) | 1981-03-06 | 1981-03-06 | Picture discriminating method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57147376A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4663662A (en) * | 1982-11-30 | 1987-05-05 | Tokyo Shibaura Denki Kabushiki Kaisha | Picture signal processing system featuring simple or dithering binarization processing selected in response to local variations in picture density |
| US4757389A (en) * | 1987-06-15 | 1988-07-12 | Xerox Corporation | Calibration improvement with dither for a raster input scanner |
-
1981
- 1981-03-06 JP JP56032278A patent/JPS57147376A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4663662A (en) * | 1982-11-30 | 1987-05-05 | Tokyo Shibaura Denki Kabushiki Kaisha | Picture signal processing system featuring simple or dithering binarization processing selected in response to local variations in picture density |
| US4757389A (en) * | 1987-06-15 | 1988-07-12 | Xerox Corporation | Calibration improvement with dither for a raster input scanner |
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