JPS5476008A - Shading correcting device - Google Patents

Shading correcting device

Info

Publication number
JPS5476008A
JPS5476008A JP14447477A JP14447477A JPS5476008A JP S5476008 A JPS5476008 A JP S5476008A JP 14447477 A JP14447477 A JP 14447477A JP 14447477 A JP14447477 A JP 14447477A JP S5476008 A JPS5476008 A JP S5476008A
Authority
JP
Japan
Prior art keywords
manuscript
information
solid
amplifier
scanning
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
JP14447477A
Other languages
Japanese (ja)
Inventor
Yoshiaki Kamimoto
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 JP14447477A priority Critical patent/JPS5476008A/en
Publication of JPS5476008A publication Critical patent/JPS5476008A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To secure the shading correction with no elimination of the effective component by comparing the output signal of the solid scanner to the manuscript surface of the reference white level with the reference level, converting the error signal into the digital signal to be then drawn out in accordance with the manuscript scanning, and then controlling the gain of the voltage control amplifier.
CONSTITUTION: The shading correction is given to the picture signals given from the solid scanner which gives the photoelectric conversion to the light from the manuscript surface by the solid scanning element and through the image formation optical system. In such correcting device, the manuscript of the reference white level featuring a fixed reflection factor to the full width of the manuscript. Then the information of the reference white level is read by solid scanning element 13, and this read information is given to error voltage amplifier 16 via voltage control amplifier 14 to be compared with reference voltage VRef. And the error voltage undergoes the digital conversion through A/D converter 17 and are memorized in shift register 19 and 20. The memorized information is read out according to the manuscript scanning of element 13 and then converted to the analog signal via D/A converter. With this information, the gain of amplifier 14 is controlled.
COPYRIGHT: (C)1979,JPO&Japio
JP14447477A 1977-11-30 1977-11-30 Shading correcting device Pending JPS5476008A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14447477A JPS5476008A (en) 1977-11-30 1977-11-30 Shading correcting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14447477A JPS5476008A (en) 1977-11-30 1977-11-30 Shading correcting device

Publications (1)

Publication Number Publication Date
JPS5476008A true JPS5476008A (en) 1979-06-18

Family

ID=15363128

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14447477A Pending JPS5476008A (en) 1977-11-30 1977-11-30 Shading correcting device

Country Status (1)

Country Link
JP (1) JPS5476008A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59100666A (en) * 1982-11-30 1984-06-09 Matsushita Graphic Commun Syst Inc Eprom writer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4979733A (en) * 1972-11-13 1974-08-01
JPS5011531A (en) * 1973-05-31 1975-02-06

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4979733A (en) * 1972-11-13 1974-08-01
JPS5011531A (en) * 1973-05-31 1975-02-06

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59100666A (en) * 1982-11-30 1984-06-09 Matsushita Graphic Commun Syst Inc Eprom writer
JPH0522432B2 (en) * 1982-11-30 1993-03-29 Matsushita Graphic Communic

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