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JPS5510270A - Shading corrector of original reader - Google Patents

Shading corrector of original reader

Info

Publication number
JPS5510270A
JPS5510270A JP8331178A JP8331178A JPS5510270A JP S5510270 A JPS5510270 A JP S5510270A JP 8331178 A JP8331178 A JP 8331178A JP 8331178 A JP8331178 A JP 8331178A JP S5510270 A JPS5510270 A JP S5510270A
Authority
JP
Japan
Prior art keywords
comparator
shading
over
switch
photoelectric element
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
Application number
JP8331178A
Other languages
Japanese (ja)
Other versions
JPS633502B2 (en
Inventor
Hiroshi Mitsuda
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8331178A priority Critical patent/JPS5510270A/en
Publication of JPS5510270A publication Critical patent/JPS5510270A/en
Publication of JPS633502B2 publication Critical patent/JPS633502B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Optical Systems Of Projection Type Copiers (AREA)
  • Character Input (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE: To make accurately corrections of variation in shading waveform, etc., by sequentially storing shading waveforms in RAM, etc., over an original read and by reading and correcting contents of the memory at the time of photoelectric conversion on the original surface.
CONSTITUTION: The output of clock frequency generator 10 is applied to frequency counter 11, which outputs address signals via switch S operation synchronizing with the scan of a photoelectric element, and divided and the division output is supplied to change-over switch 8 synchronizing with the photoelectric element scan. The waveforms of the photoelectric element, divided by resistances R1 to R8, are sequentially extracted by switch 8 and then supplied to voltage comparator 9. The other input terminal of this comparator 9 is applied with a fixed threshold voltage developed by variable resistor VR, and over an original read, the part of the level more than the threshold level is applied to adder 12 which sums up the outputs of comparator 9 and RAM12 and then writes the sum to RAM13. During the photoelectric conversion, the contents of RAM13 are read out and the shading correction of a part with variation in waveform is done.
COPYRIGHT: (C)1980,JPO&Japio
JP8331178A 1978-07-07 1978-07-07 Shading corrector of original reader Granted JPS5510270A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8331178A JPS5510270A (en) 1978-07-07 1978-07-07 Shading corrector of original reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8331178A JPS5510270A (en) 1978-07-07 1978-07-07 Shading corrector of original reader

Publications (2)

Publication Number Publication Date
JPS5510270A true JPS5510270A (en) 1980-01-24
JPS633502B2 JPS633502B2 (en) 1988-01-25

Family

ID=13798865

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8331178A Granted JPS5510270A (en) 1978-07-07 1978-07-07 Shading corrector of original reader

Country Status (1)

Country Link
JP (1) JPS5510270A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5999881A (en) * 1982-10-15 1984-06-08 エヌ・シー・アール・カナダ・リミテッド―エヌ・シー・アール・カナダ・エル・ティー・イー・イー Automatic light intensity control system
JPS6264063U (en) * 1985-10-14 1987-04-21
JPS62188862U (en) * 1986-05-20 1987-12-01

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5999881A (en) * 1982-10-15 1984-06-08 エヌ・シー・アール・カナダ・リミテッド―エヌ・シー・アール・カナダ・エル・ティー・イー・イー Automatic light intensity control system
JPS6264063U (en) * 1985-10-14 1987-04-21
JPS62188862U (en) * 1986-05-20 1987-12-01

Also Published As

Publication number Publication date
JPS633502B2 (en) 1988-01-25

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