JPS57145472A - Original reader - Google Patents

Original reader

Info

Publication number
JPS57145472A
JPS57145472A JP56030469A JP3046981A JPS57145472A JP S57145472 A JPS57145472 A JP S57145472A JP 56030469 A JP56030469 A JP 56030469A JP 3046981 A JP3046981 A JP 3046981A JP S57145472 A JPS57145472 A JP S57145472A
Authority
JP
Japan
Prior art keywords
original
output
unevenness
memory
analog
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
JP56030469A
Other languages
Japanese (ja)
Inventor
Minoru Ogata
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP56030469A priority Critical patent/JPS57145472A/en
Publication of JPS57145472A publication Critical patent/JPS57145472A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/401—Compensating positionally unequal response of the pick-up or reproducing head

Abstract

PURPOSE:To realize the follow-up to a change of the unevenness of the reading system, by storing a signal having the unevenness proper to the reading system into a memory in the state of no original is inserted and compensating the information given from the original when it is inserted. CONSTITUTION:The output of a photodetector 6 forms a waveform having the unevenness in the state under which no original exists. Then this output of the photodetector 6 is stored in a 1-line analog memory 10 by turning on an analog switch 12 and turning off an analog switch 13 respectively. After this, the switches 12 and 13 are turned off and on respectively. When an original is set, an analog divider 8 works to output the value of compensation from the output of the detector 6 positioned on the first line of the original and the output of the memory 10.
JP56030469A 1981-03-05 1981-03-05 Original reader Pending JPS57145472A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56030469A JPS57145472A (en) 1981-03-05 1981-03-05 Original reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56030469A JPS57145472A (en) 1981-03-05 1981-03-05 Original reader

Publications (1)

Publication Number Publication Date
JPS57145472A true JPS57145472A (en) 1982-09-08

Family

ID=12304725

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56030469A Pending JPS57145472A (en) 1981-03-05 1981-03-05 Original reader

Country Status (1)

Country Link
JP (1) JPS57145472A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59175279A (en) * 1983-03-25 1984-10-04 Canon Inc Method for correcting shading distortion
JPS59226967A (en) * 1983-06-08 1984-12-20 Mitsubishi Rayon Co Ltd Picture measurement system
JPS60123167A (en) * 1983-12-07 1985-07-01 Canon Inc Picture processing device
JPS6267686A (en) * 1985-09-19 1987-03-27 Furuno Electric Co Ltd Method and device for correcting light quantity distortion by pattern recognition technique
JPS6348960A (en) * 1986-08-19 1988-03-01 Canon Inc Image reading device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59175279A (en) * 1983-03-25 1984-10-04 Canon Inc Method for correcting shading distortion
JPH057913B2 (en) * 1983-03-25 1993-01-29 Canon Kk
JPS59226967A (en) * 1983-06-08 1984-12-20 Mitsubishi Rayon Co Ltd Picture measurement system
JPS60123167A (en) * 1983-12-07 1985-07-01 Canon Inc Picture processing device
JPS6267686A (en) * 1985-09-19 1987-03-27 Furuno Electric Co Ltd Method and device for correcting light quantity distortion by pattern recognition technique
JPS6348960A (en) * 1986-08-19 1988-03-01 Canon Inc Image reading device

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