JPS5469337A - Shading correction system - Google Patents

Shading correction system

Info

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
Application number
JP13686777A
Other languages
Japanese (ja)
Inventor
Mamoru Maeda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP13686777A priority Critical patent/JPS5469337A/en
Publication of JPS5469337A publication Critical patent/JPS5469337A/en
Pending legal-status Critical Current

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
JP13686777A 1977-11-15 1977-11-15 Shading correction system Pending JPS5469337A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62133587A (en) * 1985-12-05 1987-06-16 Mitsubishi Electric Corp Image binarization-processing device

Cited By (1)

* Cited by examiner, † Cited by third party
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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