JPS54144807A - Memory unit for shading amount - Google Patents

Memory unit for shading amount

Info

Publication number
JPS54144807A
JPS54144807A JP5302778A JP5302778A JPS54144807A JP S54144807 A JPS54144807 A JP S54144807A JP 5302778 A JP5302778 A JP 5302778A JP 5302778 A JP5302778 A JP 5302778A JP S54144807 A JPS54144807 A JP S54144807A
Authority
JP
Japan
Prior art keywords
scanning period
memorizing
picture
converter
picture signal
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
JP5302778A
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 JP5302778A priority Critical patent/JPS54144807A/en
Publication of JPS54144807A publication Critical patent/JPS54144807A/en
Pending legal-status Critical Current

Links

Landscapes

  • Picture Signal Circuits (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

PURPOSE: To perform suitable shading correction without using the A/D converter of high speed, by memorizing all the information corresponding to all the picture element for one scanning period, in the reader reading in original through the use of solidstate memory elements.
CONSTITUTION: In the unit providing the memory circuit 5 memorizing the information corresponding to each picture element in one horizontal scanning period of the picture signal from the solidstate pick up element to respective address, sample hold circuit S/H2 sample-holding the content of picture signal every picture element, and A/D converter 3 converting the output from the circuit 2 into the digital signal, and memorizing the amount of shading of light source and pick up objective, the same part of the picked up objective is repetitively horizontal-scanned in a plurality of numbers and control is made with the control circuit CC so that the same picture signal is obtained during horizontal scanning period. The content of information of the picture element in the picture signal corresponding to the horizontal scanning period with this constitution is sampled with the sampling pulse having the period longer than the time width required for the operation of the converter 3, in advance.
COPYRIGHT: (C)1979,JPO&Japio
JP5302778A 1978-05-03 1978-05-03 Memory unit for shading amount Pending JPS54144807A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5302778A JPS54144807A (en) 1978-05-03 1978-05-03 Memory unit for shading amount

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5302778A JPS54144807A (en) 1978-05-03 1978-05-03 Memory unit for shading amount

Publications (1)

Publication Number Publication Date
JPS54144807A true JPS54144807A (en) 1979-11-12

Family

ID=12931399

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5302778A Pending JPS54144807A (en) 1978-05-03 1978-05-03 Memory unit for shading amount

Country Status (1)

Country Link
JP (1) JPS54144807A (en)

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