JPS57106272A - Method for compression of multilevel picture data - Google Patents

Method for compression of multilevel picture data

Info

Publication number
JPS57106272A
JPS57106272A JP18242980A JP18242980A JPS57106272A JP S57106272 A JPS57106272 A JP S57106272A JP 18242980 A JP18242980 A JP 18242980A JP 18242980 A JP18242980 A JP 18242980A JP S57106272 A JPS57106272 A JP S57106272A
Authority
JP
Japan
Prior art keywords
density level
encoded
section
code
picture data
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
JP18242980A
Other languages
Japanese (ja)
Inventor
Yoshitoshi Yamauchi
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 JP18242980A priority Critical patent/JPS57106272A/en
Publication of JPS57106272A publication Critical patent/JPS57106272A/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

Abstract

PURPOSE:To compress multilevel picture data efficiently, by performing the run length encoding in a section of a constant density level and by performing the encoding corresponding to a density level difference in a section of a variable density level. CONSTITUTION:Since scanning steps 0-3 are in a section of continuity of the white level, they are encoded to ''010'' of the Weyl code. Since scanning steps 3-7 are in a section of continuity of the change of the density level and the scanning length 4 and levels are 3, 5, 6, and 7, they are encoded to ''1110'' of the bit by bit code and ''011, 101, 110, 111'' of the density level code. Since scanning steps 7-9 are constant in the density level 7, they are encoded to ''10'' of the mix code. Other sections are encoded similarly.
JP18242980A 1980-12-22 1980-12-22 Method for compression of multilevel picture data Pending JPS57106272A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18242980A JPS57106272A (en) 1980-12-22 1980-12-22 Method for compression of multilevel picture data

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18242980A JPS57106272A (en) 1980-12-22 1980-12-22 Method for compression of multilevel picture data

Publications (1)

Publication Number Publication Date
JPS57106272A true JPS57106272A (en) 1982-07-02

Family

ID=16118114

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18242980A Pending JPS57106272A (en) 1980-12-22 1980-12-22 Method for compression of multilevel picture data

Country Status (1)

Country Link
JP (1) JPS57106272A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60186970A (en) * 1984-03-05 1985-09-24 Shimadzu Corp Compressing method of image data
JP2013138422A (en) * 2008-11-10 2013-07-11 Apple Inc System and method for compressing stream of integer-valued data

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60186970A (en) * 1984-03-05 1985-09-24 Shimadzu Corp Compressing method of image data
JP2013138422A (en) * 2008-11-10 2013-07-11 Apple Inc System and method for compressing stream of integer-valued data
JP2016006961A (en) * 2008-11-10 2016-01-14 アップル インコーポレイテッド System and method for compressing stream of integer-valued data

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