JPS57116481A - Image coding method - Google Patents

Image coding method

Info

Publication number
JPS57116481A
JPS57116481A JP353281A JP353281A JPS57116481A JP S57116481 A JPS57116481 A JP S57116481A JP 353281 A JP353281 A JP 353281A JP 353281 A JP353281 A JP 353281A JP S57116481 A JPS57116481 A JP S57116481A
Authority
JP
Japan
Prior art keywords
signal
run
length
mean
difference
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
JP353281A
Other languages
Japanese (ja)
Inventor
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 JP353281A priority Critical patent/JPS57116481A/en
Publication of JPS57116481A publication Critical patent/JPS57116481A/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
    • H04N1/41—Bandwidth or redundancy reduction
    • H04N1/411—Bandwidth or redundancy reduction for the transmission or storage or reproduction of two-tone pictures, e.g. black and white pictures
    • H04N1/413—Systems or arrangements allowing the picture to be reproduced without loss or modification of picture-information
    • H04N1/419—Systems or arrangements allowing the picture to be reproduced without loss or modification of picture-information in which encoding of the length of a succession of picture-elements of the same value along a scanning line is the only encoding step

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

PURPOSE:To improve compressibility by obtaining a run-length sequence signal, containing an array of run lengths of picture elements in time order, from an original scanning signal, by successively finding differnce values between the respective run-length values of the signal and a reference run-length value, and thus by generating an image signal on the basis of the difference values. CONSTITUTION:The run-length counter 2 of an image coding device 1 receives the original scanning signal SC of an electric binary signal obtained by scanning an original image, and then outputs a run-length sequence signal RL of every scanning line. This signal RL is supplied to a mean-value circuit 3 to obtain the white mean run-length value signal AVW and black mean run-length value AVB of one scanning line. Then, a difference device 4 finds a difference signal SB between the signal RL and the mean run-length value signals AVW and AVB, and this difference signal SB is converted by a coder 5 into binary codes, which are outputted as a differnce run-length sequence signal SRL. Thus, the compressibility of the coding of the image signal is increased.
JP353281A 1981-01-13 1981-01-13 Image coding method Pending JPS57116481A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP353281A JPS57116481A (en) 1981-01-13 1981-01-13 Image coding method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP353281A JPS57116481A (en) 1981-01-13 1981-01-13 Image coding method

Publications (1)

Publication Number Publication Date
JPS57116481A true JPS57116481A (en) 1982-07-20

Family

ID=11559999

Family Applications (1)

Application Number Title Priority Date Filing Date
JP353281A Pending JPS57116481A (en) 1981-01-13 1981-01-13 Image coding method

Country Status (1)

Country Link
JP (1) JPS57116481A (en)

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