JPS5549069A - Digital facsimile equipment available for half-tone radiophoto transmission - Google Patents
Digital facsimile equipment available for half-tone radiophoto transmissionInfo
- Publication number
- JPS5549069A JPS5549069A JP12324078A JP12324078A JPS5549069A JP S5549069 A JPS5549069 A JP S5549069A JP 12324078 A JP12324078 A JP 12324078A JP 12324078 A JP12324078 A JP 12324078A JP S5549069 A JPS5549069 A JP S5549069A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- picture
- circuit
- density
- coded
- 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
Landscapes
- Facsimile Image Signal Circuits (AREA)
Abstract
PURPOSE: To make half-tone transmission of a picture possible by coding half tones of a picture original with density section and then by performing compressing coding process of them.
CONSTITUTION: An analog picture signal from photoelectric conversion scanner circuit 11 is applied to A/D converter ciucuit 12, where the signal is converted into a three-bit octal digital signal, which is stored in picture signal storage circuit 13. In this way, picture density is sectioned by eight gradiations, and eight threshold levels are set in accordance with them. Next, "1" with the digital signal exceeding the threshold level or "0" with it below it is displayed on a fixed digit. In this way, a run-length-coded signal is compared with the above threshold level only information on a different part is coded to reduce bits in number, thereby lessening transmitted signals. This bit signal is sent to control circuit 15, which performs the whole control such as actuation of a sub-scan. Received signals appear on a screen by adjusting recording density by controlling the value of a recording voltage and its application time by memory circuit 23 and control circuit 25.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12324078A JPS5549069A (en) | 1978-10-05 | 1978-10-05 | Digital facsimile equipment available for half-tone radiophoto transmission |
US06/081,635 US4353096A (en) | 1978-10-05 | 1979-10-04 | Digital facsimile system to band-compress half-tone picture signals |
GB7934478A GB2035747B (en) | 1978-10-05 | 1979-10-04 | Bandwidth compression of a continuous tone facsimile signal |
DE2940487A DE2940487C2 (en) | 1978-10-05 | 1979-10-05 | Digital facsimile system for transmitting halftone image signals |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12324078A JPS5549069A (en) | 1978-10-05 | 1978-10-05 | Digital facsimile equipment available for half-tone radiophoto transmission |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5549069A true JPS5549069A (en) | 1980-04-08 |
Family
ID=14855661
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12324078A Pending JPS5549069A (en) | 1978-10-05 | 1978-10-05 | Digital facsimile equipment available for half-tone radiophoto transmission |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5549069A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6234199A (en) * | 1985-08-08 | 1987-02-14 | カシオ計算機株式会社 | Recorder/reproducer |
-
1978
- 1978-10-05 JP JP12324078A patent/JPS5549069A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6234199A (en) * | 1985-08-08 | 1987-02-14 | カシオ計算機株式会社 | Recorder/reproducer |
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