JPS55102966A - Half-tone reproduction circuit for facsimile or the like - Google Patents
Half-tone reproduction circuit for facsimile or the likeInfo
- Publication number
- JPS55102966A JPS55102966A JP1025679A JP1025679A JPS55102966A JP S55102966 A JPS55102966 A JP S55102966A JP 1025679 A JP1025679 A JP 1025679A JP 1025679 A JP1025679 A JP 1025679A JP S55102966 A JPS55102966 A JP S55102966A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- picture
- signal
- bit
- recording
- 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.)
- Granted
Links
Landscapes
- Preparing Plates And Mask In Photomechanical Process (AREA)
- Facsimile Image Signal Circuits (AREA)
Abstract
PURPOSE: To obtain a picture of excellent gradation reproducibility by improving the apparent half-tone reproducibility of a recording picture by converting pulse density into a bit pattern matching with recording density characteristics of a recording method.
CONSTITUTION: An analog picture signal from picture input terminal 6 is converted into a digital signal consisting of n bits including black information and one bit showing only white information by A/D converter circuit 1 and after this signal is applied to memory circuit 2 and synchronized with reference clocks from reference clock signal input terminal 7, the signal including the n-bit black information is applied to bit pattern converter circuit 10. An n-bit signal only outputted from this circuit is converted into a bit pattern matching with recording density characteristics and the converted pattern is applied to comparator circuit 3, where it is compared with reference clock pulses of m bits obtained by counter circuit 4, and only when the output of circuit 4 is smaller, output pulses are applied to recording driver circuit 9 to project a picture of excellent gradation reproducibility.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1025679A JPS55102966A (en) | 1979-01-30 | 1979-01-30 | Half-tone reproduction circuit for facsimile or the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1025679A JPS55102966A (en) | 1979-01-30 | 1979-01-30 | Half-tone reproduction circuit for facsimile or the like |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55102966A true JPS55102966A (en) | 1980-08-06 |
| JPS6342901B2 JPS6342901B2 (en) | 1988-08-26 |
Family
ID=11745228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1025679A Granted JPS55102966A (en) | 1979-01-30 | 1979-01-30 | Half-tone reproduction circuit for facsimile or the like |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55102966A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4347523A (en) * | 1980-04-24 | 1982-08-31 | Fuji Photo Film Co., Ltd. | Laser recorder |
| US4370667A (en) * | 1980-02-08 | 1983-01-25 | Fuji Photo Film Co., Ltd. | Laser recorder |
| US4375064A (en) * | 1980-04-24 | 1983-02-22 | Fuji Photo Film Co., Ltd. | Laser recorder |
| US4404570A (en) * | 1980-02-08 | 1983-09-13 | Fuji Photo Film Co., Ltd. | Laser recorder |
-
1979
- 1979-01-30 JP JP1025679A patent/JPS55102966A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4370667A (en) * | 1980-02-08 | 1983-01-25 | Fuji Photo Film Co., Ltd. | Laser recorder |
| US4404570A (en) * | 1980-02-08 | 1983-09-13 | Fuji Photo Film Co., Ltd. | Laser recorder |
| US4347523A (en) * | 1980-04-24 | 1982-08-31 | Fuji Photo Film Co., Ltd. | Laser recorder |
| US4375064A (en) * | 1980-04-24 | 1983-02-22 | Fuji Photo Film Co., Ltd. | Laser recorder |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6342901B2 (en) | 1988-08-26 |
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