JPS5694873A - Method and device for image reproduction - Google Patents
Method and device for image reproductionInfo
- Publication number
- JPS5694873A JPS5694873A JP17134079A JP17134079A JPS5694873A JP S5694873 A JPS5694873 A JP S5694873A JP 17134079 A JP17134079 A JP 17134079A JP 17134079 A JP17134079 A JP 17134079A JP S5694873 A JPS5694873 A JP S5694873A
- Authority
- JP
- Japan
- Prior art keywords
- comparator
- address
- signal
- rom106
- rom1
- 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
- H04N1/40068—Modification of image resolution, i.e. determining the values of picture elements at new relative positions
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Combination Of More Than One Step In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
- Facsimile Image Signal Circuits (AREA)
Abstract
PURPOSE:To realize a virtually sharp reproduction for a coarse picture element original, by giving an A/D conversion to the reading signal and then selecting the dither pattern data stored in the ROM by the conversion signal and with the address control to then deliver the pattern data with every reading picture element. CONSTITUTION:The A/D comparator 104 contains a quadrivalent comparator and divides the output Vout of the CCD103 into the five regions with the four threshold values. The address encoder 105 produced the address data for ROM1 and ROM2 of the ROM106 and 107 by the output level of the comparator 104, and the information equivalent to the dither pattern is stored previously into the ROM106 and 107. This storage value is read out by designating the corresponding address of the ROM. The memory 1(108) and memory 2(109) read the dither information of the ROM1 and 2 to then write and store them successively. The gate 110 switches the outputs of the memories 1 and 2 alternately and then sends them to the signal operating part 111. At the part 111, the reversal, contraction and enlargement, and other processes are carried out for the picture. Then a luminance modulation is given to the laser beam by the output signal of the part 111.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17134079A JPS5694873A (en) | 1979-12-28 | 1979-12-28 | Method and device for image reproduction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17134079A JPS5694873A (en) | 1979-12-28 | 1979-12-28 | Method and device for image reproduction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5694873A true JPS5694873A (en) | 1981-07-31 |
Family
ID=15921396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17134079A Pending JPS5694873A (en) | 1979-12-28 | 1979-12-28 | Method and device for image reproduction |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5694873A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5838966A (en) * | 1981-09-01 | 1983-03-07 | Canon Inc | Color printer |
| JPS5967559A (en) * | 1982-10-08 | 1984-04-17 | Canon Inc | Color printer |
| JPH01105269A (en) * | 1988-09-01 | 1989-04-21 | Canon Inc | Color image recorder |
-
1979
- 1979-12-28 JP JP17134079A patent/JPS5694873A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5838966A (en) * | 1981-09-01 | 1983-03-07 | Canon Inc | Color printer |
| JPS5967559A (en) * | 1982-10-08 | 1984-04-17 | Canon Inc | Color printer |
| JPH01105269A (en) * | 1988-09-01 | 1989-04-21 | Canon Inc | Color image recorder |
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