JPS5469337A - Shading correction system - Google Patents
Shading correction systemInfo
- Publication number
- JPS5469337A JPS5469337A JP13686777A JP13686777A JPS5469337A JP S5469337 A JPS5469337 A JP S5469337A JP 13686777 A JP13686777 A JP 13686777A JP 13686777 A JP13686777 A JP 13686777A JP S5469337 A JPS5469337 A JP S5469337A
- Authority
- JP
- Japan
- Prior art keywords
- shading
- video signal
- converter
- bit
- regenerated
- 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
Abstract
PURPOSE: To remove only shading precisely by taking out only shading components from the reader, storing the level of the 1st bit and regenerating the shading components at the time of reading to correct the video signal.
CONSTITUTION: Video signal (a) corresponding to the shading component in case of absence of a copy is applied from the reader to the input terminal and 1 bit of signal (a) is separated by sample holding circuit 8 and is applied to comparator 10 through switch 91. Counter 14 and converter 13 are operated and the level of the 1st bit is determined and stored in memory 15 and the difference of levels among bits is also stored in serial memory 12. When the copy is read, the shading portions of memories 15 and 12 are regenerated in the output side of DA converter 13; in divider 16, corresponding bits are processed by video signal (a) and shading component i regenerated in the output side of DA converter 13, so that video signal (a) is corrected to the one with uniform condition.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13686777A JPS5469337A (en) | 1977-11-15 | 1977-11-15 | Shading correction system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13686777A JPS5469337A (en) | 1977-11-15 | 1977-11-15 | Shading correction system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5469337A true JPS5469337A (en) | 1979-06-04 |
Family
ID=15185369
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13686777A Pending JPS5469337A (en) | 1977-11-15 | 1977-11-15 | Shading correction system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5469337A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62133587A (en) * | 1985-12-05 | 1987-06-16 | Mitsubishi Electric Corp | Image binarization-processing device |
-
1977
- 1977-11-15 JP JP13686777A patent/JPS5469337A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62133587A (en) * | 1985-12-05 | 1987-06-16 | Mitsubishi Electric Corp | Image binarization-processing device |
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