JPS57183178A - Original reader - Google Patents

Original reader

Info

Publication number
JPS57183178A
JPS57183178A JP56067513A JP6751381A JPS57183178A JP S57183178 A JPS57183178 A JP S57183178A JP 56067513 A JP56067513 A JP 56067513A JP 6751381 A JP6751381 A JP 6751381A JP S57183178 A JPS57183178 A JP S57183178A
Authority
JP
Japan
Prior art keywords
readout
image
original
microcomputer
ram
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
JP56067513A
Other languages
Japanese (ja)
Inventor
Yoshio Nishida
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.)
Minolta Co Ltd
Original Assignee
Minolta 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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP56067513A priority Critical patent/JPS57183178A/en
Publication of JPS57183178A publication Critical patent/JPS57183178A/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

Abstract

PURPOSE:To obtain a binary coded circuit which is free of erroneous discrimination due to a decrease in the quantity of circumferential light, etc., and is stable without reference to aging, by providing a reference marker for threshold setting which has prescribed length and is colored with uniform density on the whole outside of an original readout region. CONSTITUTION:When a power switch is turned on, an operation command signal is sent out of a microcomputer 15 to a DC power source 16 and an image sensor 12 starts operation. Prior to an original readout, a reference reflective marker for threshold setting is read and its data is stored in the RAM of the microcomputer 15 through a sample holding circuit 18 and an A-D converter 19. Its digital value is used as a threshold level black-and-white discrimination during one scan of the image readout. As the image readout starts, a comparator 22 compares an image signal from an amplifier 20 with the threshold level stored in the RAM to obtain a binary coded signal close to original information under no influence of a decrease in the amount of circumferential light, etc.
JP56067513A 1981-05-02 1981-05-02 Original reader Pending JPS57183178A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56067513A JPS57183178A (en) 1981-05-02 1981-05-02 Original reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56067513A JPS57183178A (en) 1981-05-02 1981-05-02 Original reader

Publications (1)

Publication Number Publication Date
JPS57183178A true JPS57183178A (en) 1982-11-11

Family

ID=13347132

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56067513A Pending JPS57183178A (en) 1981-05-02 1981-05-02 Original reader

Country Status (1)

Country Link
JP (1) JPS57183178A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6041876A (en) * 1983-08-18 1985-03-05 Canon Inc Original reading device
JPS61154365A (en) * 1984-12-27 1986-07-14 Koyo Denshi Kogyo Kk Generator of threshold level pattern
JPS6213164A (en) * 1985-07-10 1987-01-21 Konishiroku Photo Ind Co Ltd Original information reader
JPS62216587A (en) * 1986-03-18 1987-09-24 Nec Corp Image reader

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6041876A (en) * 1983-08-18 1985-03-05 Canon Inc Original reading device
JPH0531868B2 (en) * 1983-08-18 1993-05-13 Canon Kk
JPS61154365A (en) * 1984-12-27 1986-07-14 Koyo Denshi Kogyo Kk Generator of threshold level pattern
JPS6213164A (en) * 1985-07-10 1987-01-21 Konishiroku Photo Ind Co Ltd Original information reader
JPS62216587A (en) * 1986-03-18 1987-09-24 Nec Corp Image reader
JPH0577230B2 (en) * 1986-03-18 1993-10-26 Nippon Electric Co

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