JPS57125577A - Binarized tonal processing method for analog video signal - Google Patents

Binarized tonal processing method for analog video signal

Info

Publication number
JPS57125577A
JPS57125577A JP56011847A JP1184781A JPS57125577A JP S57125577 A JPS57125577 A JP S57125577A JP 56011847 A JP56011847 A JP 56011847A JP 1184781 A JP1184781 A JP 1184781A JP S57125577 A JPS57125577 A JP S57125577A
Authority
JP
Japan
Prior art keywords
level
reading
binarized
video signal
analog video
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
JP56011847A
Other languages
Japanese (ja)
Inventor
Mitsuru Kondo
Shuichi Takahashi
Kazuhiro Yuasa
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 JP56011847A priority Critical patent/JPS57125577A/en
Publication of JPS57125577A publication Critical patent/JPS57125577A/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
    • H04N1/403—Discrimination between the two tones in the picture signal of a two-tone original

Landscapes

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

Abstract

PURPOSE:To prevent distortion in network point processing, by providing a constant relation between compared level and reading level, in a method varying a binarized tonal processing comparison level sequentially in matching with read-in scanning. CONSTITUTION:In video reading in whicn an analog video signal level V'B for black reading and an analog video signal level V'W for white reading have relation of V'B<V'W, a minimum value VB at black level of the binarized tonal processing comparison level is taken larger than the V'B and a maximum value VW of white level is taken smaller than the V'W. That is, the black reading level V'W of a video reading analog signal and the white reading level V'W are taken out and the binarized tonal processing comparison level is distributed between them. As a result, the output around the minimum level (V'B) and the maximum value (V'W) of the analog video signal can be uniformed with black or white, even when the binarized tonal processing comparison level is taken as the mininum value (VB) and the maximum value (VW).
JP56011847A 1981-01-29 1981-01-29 Binarized tonal processing method for analog video signal Pending JPS57125577A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56011847A JPS57125577A (en) 1981-01-29 1981-01-29 Binarized tonal processing method for analog video signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56011847A JPS57125577A (en) 1981-01-29 1981-01-29 Binarized tonal processing method for analog video signal

Publications (1)

Publication Number Publication Date
JPS57125577A true JPS57125577A (en) 1982-08-04

Family

ID=11789106

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56011847A Pending JPS57125577A (en) 1981-01-29 1981-01-29 Binarized tonal processing method for analog video signal

Country Status (1)

Country Link
JP (1) JPS57125577A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51114133A (en) * 1975-03-14 1976-10-07 Xerox Corp Method of and apparatus for half tone duplication
JPS5580958A (en) * 1978-12-15 1980-06-18 Toshiba Corp Picture signal binary coding system
JPS56115073A (en) * 1980-02-18 1981-09-10 Canon Inc Picture scanning method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51114133A (en) * 1975-03-14 1976-10-07 Xerox Corp Method of and apparatus for half tone duplication
JPS5580958A (en) * 1978-12-15 1980-06-18 Toshiba Corp Picture signal binary coding system
JPS56115073A (en) * 1980-02-18 1981-09-10 Canon Inc Picture scanning method

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