JPS57125578A - Processing method for intermediate tone picture - Google Patents
Processing method for intermediate tone pictureInfo
- Publication number
- JPS57125578A JPS57125578A JP56012165A JP1216581A JPS57125578A JP S57125578 A JPS57125578 A JP S57125578A JP 56012165 A JP56012165 A JP 56012165A JP 1216581 A JP1216581 A JP 1216581A JP S57125578 A JPS57125578 A JP S57125578A
- Authority
- JP
- Japan
- Prior art keywords
- random number
- circuit
- picture element
- density signal
- inputted
- 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 obtain a binary output picture in which moire is substantially excluded, by randomizing the frequency component in a long period which is remarkable as moire. CONSTITUTION:An analog density signal of an intermediate tone picture is inputted to an A/D converter 100, it is quantized into picture element unit in the timing of clock pulse and inputted to a comparison circuit 104 as a picture element density signal. Every time a random number is outputted to a selection circuit 108 from a shift register 112, a signal is given from the register 112 to a random number generator 110 to generate the random number. The circuit 108 selects a value of the state to be specified for a counter 106 as a threshold value and gives it to the comparison circuit 104. The comparisn circuit 104 compares the level of the picture element density signal inputted from the A/D converter 100 with a value of random number given from the selection circuit 108, and as a result, an output picture element density signal of ''1'' level or ''0'' level is outputted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56012165A JPS57125578A (en) | 1981-01-29 | 1981-01-29 | Processing method for intermediate tone picture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56012165A JPS57125578A (en) | 1981-01-29 | 1981-01-29 | Processing method for intermediate tone picture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57125578A true JPS57125578A (en) | 1982-08-04 |
Family
ID=11797822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56012165A Pending JPS57125578A (en) | 1981-01-29 | 1981-01-29 | Processing method for intermediate tone picture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57125578A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60120482A (en) * | 1983-12-02 | 1985-06-27 | Canon Inc | Picture signal processor |
| JPH09201113A (en) * | 1996-11-11 | 1997-08-05 | Iseki & Co Ltd | Sulky type seedling transplanter equipped with fertilizer applicator |
-
1981
- 1981-01-29 JP JP56012165A patent/JPS57125578A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60120482A (en) * | 1983-12-02 | 1985-06-27 | Canon Inc | Picture signal processor |
| JPH0557626B2 (en) * | 1983-12-02 | 1993-08-24 | Canon Kk | |
| JPH09201113A (en) * | 1996-11-11 | 1997-08-05 | Iseki & Co Ltd | Sulky type seedling transplanter equipped with fertilizer applicator |
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