JPS56115073A - Picture scanning method - Google Patents

Picture scanning method

Info

Publication number
JPS56115073A
JPS56115073A JP1878480A JP1878480A JPS56115073A JP S56115073 A JPS56115073 A JP S56115073A JP 1878480 A JP1878480 A JP 1878480A JP 1878480 A JP1878480 A JP 1878480A JP S56115073 A JPS56115073 A JP S56115073A
Authority
JP
Japan
Prior art keywords
original
comparators
ground color
reference level
design matrix
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
JP1878480A
Other languages
Japanese (ja)
Other versions
JPH0147946B2 (en
Inventor
Yukio Sato
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 JP1878480A priority Critical patent/JPS56115073A/en
Publication of JPS56115073A publication Critical patent/JPS56115073A/en
Publication of JPH0147946B2 publication Critical patent/JPH0147946B2/ja
Granted 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
    • H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Editing Of Facsimile Originals (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To realize a half tone for only a picture and thus obtain a high contrast at the edge area of the picture, by setting a proper design matrix by the ground color of the original and then changing the threshold value of the design matrix. CONSTITUTION:The ground color of the original is detected through a scan, and the reference level of detection is applied to the input Vin to be distributed to the comparators Q1-Q4. At the same time, the voltage V0 is divided by the resistances R1-R5 to be distributed to the comparators Q1-Q4 each. Then the reference level is compared with the resistance division level to decide the concentration for the reference level scanned by the resistance division level. Then the outputs D1-D4 are delivered from the comparators Q1-Q4 according to the concentration of the original and then put into a decoder DE containing a prescribed truth value table. One of Y1-Y5 is selected and delivered to the output of the decoder DE, and thus a design matrix can be set by the ground color of the original.
JP1878480A 1980-02-18 1980-02-18 Picture scanning method Granted JPS56115073A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1878480A JPS56115073A (en) 1980-02-18 1980-02-18 Picture scanning method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1878480A JPS56115073A (en) 1980-02-18 1980-02-18 Picture scanning method

Publications (2)

Publication Number Publication Date
JPS56115073A true JPS56115073A (en) 1981-09-10
JPH0147946B2 JPH0147946B2 (en) 1989-10-17

Family

ID=11981238

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1878480A Granted JPS56115073A (en) 1980-02-18 1980-02-18 Picture scanning method

Country Status (1)

Country Link
JP (1) JPS56115073A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57125577A (en) * 1981-01-29 1982-08-04 Ricoh Co Ltd Binarized tonal processing method for analog video signal
JPS58223964A (en) * 1982-06-22 1983-12-26 Konishiroku Photo Ind Co Ltd Shading compensating circuit
EP0336691A2 (en) * 1988-04-05 1989-10-11 Seiko Instruments Inc. Thermal transfer printer
US10584802B2 (en) 2014-08-21 2020-03-10 Continental Automotive Gmbh Valve core for an electronic valve

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54144127A (en) * 1978-05-01 1979-11-10 Ricoh Co Ltd Display system of intermediate tone by binary picture element

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54144127A (en) * 1978-05-01 1979-11-10 Ricoh Co Ltd Display system of intermediate tone by binary picture element

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57125577A (en) * 1981-01-29 1982-08-04 Ricoh Co Ltd Binarized tonal processing method for analog video signal
JPS58223964A (en) * 1982-06-22 1983-12-26 Konishiroku Photo Ind Co Ltd Shading compensating circuit
JPH0354510B2 (en) * 1982-06-22 1991-08-20
EP0336691A2 (en) * 1988-04-05 1989-10-11 Seiko Instruments Inc. Thermal transfer printer
EP0336691A3 (en) * 1988-04-05 1992-03-04 Seiko Instruments Inc. Thermal transfer printer
US10584802B2 (en) 2014-08-21 2020-03-10 Continental Automotive Gmbh Valve core for an electronic valve

Also Published As

Publication number Publication date
JPH0147946B2 (en) 1989-10-17

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