JPS5787679A - Density conversion system for video information - Google Patents
Density conversion system for video informationInfo
- Publication number
- JPS5787679A JPS5787679A JP55164112A JP16411280A JPS5787679A JP S5787679 A JPS5787679 A JP S5787679A JP 55164112 A JP55164112 A JP 55164112A JP 16411280 A JP16411280 A JP 16411280A JP S5787679 A JPS5787679 A JP S5787679A
- Authority
- JP
- Japan
- Prior art keywords
- dot
- complement
- clock pulse
- circuit
- density conversion
- 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
- 238000006243 chemical reaction Methods 0.000 title abstract 4
- 230000000295 complement effect Effects 0.000 abstract 4
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)
- Editing Of Facsimile Originals (AREA)
- Image Processing (AREA)
Abstract
PURPOSE:To achieve density conversion with less accumulated error independently of the density ratio of dots and lines between devices different from the dots and line density, by making an interval which subjects density conversion to lines or dots information which is made by decomposing a picture, to a stepwise period. CONSTITUTION:When a facsimile data 8-dot/mm. is outputted to a dot printer 240-dot/inch, a counter 1 counts from the complement of figure 6 clock pulse CLK and transmits a carry signal being the complement of figure 1 to a counter 2 and a NAND circuit 4. The carry signal controls an AND circuit 8 via the NAND circuit 4, OR circuit 5, and NOT circuit 7 and transmits the 6th clock pulse CLK to a terminal CLIN. The counter 2 makes count from the complement of fugure 5 and transmits the carry signal being the complement of figure 1 to an FF3. That is, the output at the terminal CLIN is made of the clock pulse of memory and the output of a terminal CLOUT is made of the clock pulse of a dot printer, to achieve dot density conversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55164112A JPS5787679A (en) | 1980-11-21 | 1980-11-21 | Density conversion system for video information |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55164112A JPS5787679A (en) | 1980-11-21 | 1980-11-21 | Density conversion system for video information |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5787679A true JPS5787679A (en) | 1982-06-01 |
Family
ID=15786975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55164112A Pending JPS5787679A (en) | 1980-11-21 | 1980-11-21 | Density conversion system for video information |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5787679A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57136859A (en) * | 1981-02-18 | 1982-08-24 | Nec Corp | Picture expanding and contracting circuit |
| JPH01164171A (en) * | 1987-12-19 | 1989-06-28 | Fujitsu Ltd | Picture density conversion system |
-
1980
- 1980-11-21 JP JP55164112A patent/JPS5787679A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57136859A (en) * | 1981-02-18 | 1982-08-24 | Nec Corp | Picture expanding and contracting circuit |
| JPH01164171A (en) * | 1987-12-19 | 1989-06-28 | Fujitsu Ltd | Picture density conversion system |
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