JPS5711573A - Picture coder - Google Patents

Picture coder

Info

Publication number
JPS5711573A
JPS5711573A JP8547080A JP8547080A JPS5711573A JP S5711573 A JPS5711573 A JP S5711573A JP 8547080 A JP8547080 A JP 8547080A JP 8547080 A JP8547080 A JP 8547080A JP S5711573 A JPS5711573 A JP S5711573A
Authority
JP
Japan
Prior art keywords
video
scanning line
signal
transmits
produces
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
JP8547080A
Other languages
Japanese (ja)
Inventor
Mamoru Maeda
Koichi Ejiri
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 JP8547080A priority Critical patent/JPS5711573A/en
Publication of JPS5711573A publication Critical patent/JPS5711573A/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
    • H04N1/405—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)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE:To promote the high efficient transmission by the band-compression further, by executing the comparing operation for video elements having greater tone change every video element and for those having less number of tone change every scanning line, to obtain the binary coded signal. CONSTITUTION:If the bright level of an input video signal VI is frequently changed, a mode control circuit 10 produces a video unit switching mode signal md1, and a dither matric memory 1 transmits a threshold value changed every video element to each scanning line for the comparison with VI. In case of a monotonous picture where the bright level of VI is not frequently changed, the circuit 10 produces a scanning line switching mode signal md2. Thus, the dither matrix memory 1 transmits the threshold value changed each line to compare it with the input video data.
JP8547080A 1980-06-24 1980-06-24 Picture coder Pending JPS5711573A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8547080A JPS5711573A (en) 1980-06-24 1980-06-24 Picture coder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8547080A JPS5711573A (en) 1980-06-24 1980-06-24 Picture coder

Publications (1)

Publication Number Publication Date
JPS5711573A true JPS5711573A (en) 1982-01-21

Family

ID=13859772

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8547080A Pending JPS5711573A (en) 1980-06-24 1980-06-24 Picture coder

Country Status (1)

Country Link
JP (1) JPS5711573A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6078672A (en) * 1983-10-04 1985-05-04 Mitsui Eng & Shipbuild Co Ltd Corrosion-proof painting method of metal surface having rust layer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6078672A (en) * 1983-10-04 1985-05-04 Mitsui Eng & Shipbuild Co Ltd Corrosion-proof painting method of metal surface having rust layer
JPS6254556B2 (en) * 1983-10-04 1987-11-16 Mitsui Zosen Kk

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