JPS57119561A - Binary-coding processing method for analog picture signal - Google Patents

Binary-coding processing method for analog picture signal

Info

Publication number
JPS57119561A
JPS57119561A JP56006061A JP606181A JPS57119561A JP S57119561 A JPS57119561 A JP S57119561A JP 56006061 A JP56006061 A JP 56006061A JP 606181 A JP606181 A JP 606181A JP S57119561 A JPS57119561 A JP S57119561A
Authority
JP
Japan
Prior art keywords
binary
coding
processing
gradation
density
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
JP56006061A
Other languages
Japanese (ja)
Other versions
JPH0340553B2 (en
Inventor
Shuichi Takahashi
Mitsuru Kondo
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 JP56006061A priority Critical patent/JPS57119561A/en
Publication of JPS57119561A publication Critical patent/JPS57119561A/en
Publication of JPH0340553B2 publication Critical patent/JPH0340553B2/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)
  • Image Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To set the density of even gradation-processing binary coding by using gradation-processing comparison levels as many as the set densities of simple binary coding, and specifying a processing comparison level by a binary-coding processing-mode indication signal and a density indication signal. CONSTITUTION:In an ROMDMD2, groups of comparison level data for gradation processinag and those for simple binary-coding processing are stored as many as density specifying signals. Address data for the DMD2 is generated by a picture-element address specifying circuit ACC for picture elements in a main and a subordinate scanning direction, and an address switching circuit AEC. The AEC inputs the output of the ACC, a gradation control signal for binary- coding mode indication and density indication signals. With a binary-coding processing mode signal, the comparison level data for the gradation-processing binary coding or simple binary coding of the DMD2 is specified, and the group of the gradation-processing comparison level used for the gradation binary coding and the binary-coding processing comparison level for the simple binary coding are specified by the density indication signals.
JP56006061A 1981-01-19 1981-01-19 Binary-coding processing method for analog picture signal Granted JPS57119561A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56006061A JPS57119561A (en) 1981-01-19 1981-01-19 Binary-coding processing method for analog picture signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56006061A JPS57119561A (en) 1981-01-19 1981-01-19 Binary-coding processing method for analog picture signal

Publications (2)

Publication Number Publication Date
JPS57119561A true JPS57119561A (en) 1982-07-26
JPH0340553B2 JPH0340553B2 (en) 1991-06-19

Family

ID=11628068

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56006061A Granted JPS57119561A (en) 1981-01-19 1981-01-19 Binary-coding processing method for analog picture signal

Country Status (1)

Country Link
JP (1) JPS57119561A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6094576A (en) * 1983-10-28 1985-05-27 Hitachi Ltd Picture signal processor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5578668A (en) * 1978-12-01 1980-06-13 Xerox Corp Method of and device for processing video

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5578668A (en) * 1978-12-01 1980-06-13 Xerox Corp Method of and device for processing video

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6094576A (en) * 1983-10-28 1985-05-27 Hitachi Ltd Picture signal processor

Also Published As

Publication number Publication date
JPH0340553B2 (en) 1991-06-19

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