JPS5799867A - Picture binary-coding method - Google Patents
Picture binary-coding methodInfo
- Publication number
- JPS5799867A JPS5799867A JP55175775A JP17577580A JPS5799867A JP S5799867 A JPS5799867 A JP S5799867A JP 55175775 A JP55175775 A JP 55175775A JP 17577580 A JP17577580 A JP 17577580A JP S5799867 A JPS5799867 A JP S5799867A
- Authority
- JP
- Japan
- Prior art keywords
- picture
- elements
- signal
- threshold pattern
- shade
- 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
- H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
- H04N1/4051—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a dispersed dots halftone pattern, the dots having substantially the same size
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Image Processing (AREA)
- Facsimile Image Signal Circuits (AREA)
Abstract
PURPOSE:To increase the number of gradations without varying picture elements in size, by using a threshold pattern which is variable in the correspondence ratio of the picture elements and threshold pattern, when obtaining a binary- coded picture signal of a shade picture by using the threshold pattern. CONSTITUTION:WHen shade picture element are to be converted into a binary signal, four matrix elements (A) of a dot matrix threshold pattern are made to correspond to one picture element (B) of a shade picture signal. Consequently, the number of elements of an output equipment is only four times as many as the number of picture elements, i.e., (number of picture elements)X(number of gradations)X1/4. Further, it is unnecessary to average a picture element signal, so fidelity to an original picture is improved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55175775A JPS5799867A (en) | 1980-12-15 | 1980-12-15 | Picture binary-coding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55175775A JPS5799867A (en) | 1980-12-15 | 1980-12-15 | Picture binary-coding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5799867A true JPS5799867A (en) | 1982-06-21 |
Family
ID=16002041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55175775A Pending JPS5799867A (en) | 1980-12-15 | 1980-12-15 | Picture binary-coding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5799867A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2587572A1 (en) * | 1985-03-20 | 1987-03-20 | Canon Kk | APPARATUS AND METHOD FOR PROCESSING IMAGES |
| US4736254A (en) * | 1984-11-22 | 1988-04-05 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for generating pseudo-halftone dots by comparing gray scale values of an original with dither threshold values stored in cells of a matrix array divided into imaginary matrices of elemental areas each containing one cell |
-
1980
- 1980-12-15 JP JP55175775A patent/JPS5799867A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4736254A (en) * | 1984-11-22 | 1988-04-05 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for generating pseudo-halftone dots by comparing gray scale values of an original with dither threshold values stored in cells of a matrix array divided into imaginary matrices of elemental areas each containing one cell |
| FR2587572A1 (en) * | 1985-03-20 | 1987-03-20 | Canon Kk | APPARATUS AND METHOD FOR PROCESSING IMAGES |
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