JPS5621276A - Initial value set system for white level follower - Google Patents
Initial value set system for white level followerInfo
- Publication number
- JPS5621276A JPS5621276A JP9577679A JP9577679A JPS5621276A JP S5621276 A JPS5621276 A JP S5621276A JP 9577679 A JP9577679 A JP 9577679A JP 9577679 A JP9577679 A JP 9577679A JP S5621276 A JPS5621276 A JP S5621276A
- Authority
- JP
- Japan
- Prior art keywords
- level
- signal
- converter
- initial value
- reference level
- 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
Abstract
PURPOSE: To enable to output the information on the document in the digital multiple level accurately, by setting the reference level of white level follower in matching with the white level of actual read-in document.
CONSTITUTION: The white level follower circuit is provided with the read only memory 3, initial value set control circuit 6, and gate circuit 7. The setting of reference level is made by controlling the gate circuit 7 with the signal from the initial value set control circuit 6, and the output of the D/A converter 5 is set to the maximum value of the reference level and input to the A/D converter 1. The input video signal is input to the converter 1. The input video signal is compared with the reference level at the converter 1, and as the result at the converter 1, the multiple level signal in digital is output on the one hand and compared difference signal is output on the other hand. In the initial value setting, the digital multiple value level signal is converted at the ROM3 selected with the signal from the circuit 6 so that the level signal can be the reference level, and the reference level corresponding to each read-in element is sequentially stored in the register 4.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9577679A JPS5621276A (en) | 1979-07-27 | 1979-07-27 | Initial value set system for white level follower |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9577679A JPS5621276A (en) | 1979-07-27 | 1979-07-27 | Initial value set system for white level follower |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5621276A true JPS5621276A (en) | 1981-02-27 |
JPS6318234B2 JPS6318234B2 (en) | 1988-04-18 |
Family
ID=14146878
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9577679A Granted JPS5621276A (en) | 1979-07-27 | 1979-07-27 | Initial value set system for white level follower |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5621276A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60231279A (en) * | 1984-05-01 | 1985-11-16 | Fuji Xerox Co Ltd | Compensating method of shading |
-
1979
- 1979-07-27 JP JP9577679A patent/JPS5621276A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60231279A (en) * | 1984-05-01 | 1985-11-16 | Fuji Xerox Co Ltd | Compensating method of shading |
Also Published As
Publication number | Publication date |
---|---|
JPS6318234B2 (en) | 1988-04-18 |
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