JPS5762466A - Original reader - Google Patents

Original reader

Info

Publication number
JPS5762466A
JPS5762466A JP55137715A JP13771580A JPS5762466A JP S5762466 A JPS5762466 A JP S5762466A JP 55137715 A JP55137715 A JP 55137715A JP 13771580 A JP13771580 A JP 13771580A JP S5762466 A JPS5762466 A JP S5762466A
Authority
JP
Japan
Prior art keywords
original
white
black
maximum
image
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
JP55137715A
Other languages
Japanese (ja)
Inventor
Shin Tsuda
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 JP55137715A priority Critical patent/JPS5762466A/en
Publication of JPS5762466A publication Critical patent/JPS5762466A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/20—Image preprocessing
    • G06V10/28—Quantising the image, e.g. histogram thresholding for discrimination between background and foreground patterns

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Character Input (AREA)

Abstract

PURPOSE:To improve the precision of reading operation without reference to the kind of an original by selecting a readout threshold level, generated by dividing a maximum and a minimum voltage obtained by detecting a white and a black image, according to the nature of the original. CONSTITUTION:A maximum and a minimum voltage held in holding circuits 11 and 13 by detecting a white and a black image on an original are divided through resistances R1 and R2, and R3 and R4 to generate threshold voltages VT1 and VT2. In this case, the VT1 is set to 70-80%, and the VT2 to 20-30% of the maximum voltage. Then, the VT1 for a white-ground original or the VT2 for a black-ground original is inputted to a binary discriminating circuit 12 by changeover a switch 14 to discriminate the black and white of the image from a signal line 4. Consequently, reading operation free of omission of information is performed without reference to the kind of the original.
JP55137715A 1980-10-03 1980-10-03 Original reader Pending JPS5762466A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55137715A JPS5762466A (en) 1980-10-03 1980-10-03 Original reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55137715A JPS5762466A (en) 1980-10-03 1980-10-03 Original reader

Publications (1)

Publication Number Publication Date
JPS5762466A true JPS5762466A (en) 1982-04-15

Family

ID=15205121

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55137715A Pending JPS5762466A (en) 1980-10-03 1980-10-03 Original reader

Country Status (1)

Country Link
JP (1) JPS5762466A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01279385A (en) * 1988-04-30 1989-11-09 Seiko Epson Corp Character recognizing device
JPH02255995A (en) * 1988-04-28 1990-10-16 Seiko Epson Corp Character segmenting method
JPH07319998A (en) * 1988-04-28 1995-12-08 Seiko Epson Corp Method for segmenting character

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5310915A (en) * 1976-07-19 1978-01-31 Hitachi Ltd Binary signal detecting circuit
JPS54146530A (en) * 1978-05-09 1979-11-15 Mitsubishi Electric Corp Binary coding circuit
JPS5542492A (en) * 1978-09-21 1980-03-25 Cit Alcatel Video analysis signal processor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5310915A (en) * 1976-07-19 1978-01-31 Hitachi Ltd Binary signal detecting circuit
JPS54146530A (en) * 1978-05-09 1979-11-15 Mitsubishi Electric Corp Binary coding circuit
JPS5542492A (en) * 1978-09-21 1980-03-25 Cit Alcatel Video analysis signal processor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02255995A (en) * 1988-04-28 1990-10-16 Seiko Epson Corp Character segmenting method
JPH07319998A (en) * 1988-04-28 1995-12-08 Seiko Epson Corp Method for segmenting character
JP2570415B2 (en) * 1988-04-28 1997-01-08 セイコーエプソン株式会社 Character extraction method
JPH01279385A (en) * 1988-04-30 1989-11-09 Seiko Epson Corp Character recognizing device

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