JPS57106274A - Method for compression in multilevel picture data - Google Patents

Method for compression in multilevel picture data

Info

Publication number
JPS57106274A
JPS57106274A JP55182559A JP18255980A JPS57106274A JP S57106274 A JPS57106274 A JP S57106274A JP 55182559 A JP55182559 A JP 55182559A JP 18255980 A JP18255980 A JP 18255980A JP S57106274 A JPS57106274 A JP S57106274A
Authority
JP
Japan
Prior art keywords
density level
section
code
scanning steps
change
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
JP55182559A
Other languages
Japanese (ja)
Other versions
JPH0123033B2 (en
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 JP55182559A priority Critical patent/JPS57106274A/en
Publication of JPS57106274A publication Critical patent/JPS57106274A/en
Publication of JPH0123033B2 publication Critical patent/JPH0123033B2/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
    • H04N1/41—Bandwidth or redundancy reduction

Landscapes

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

Abstract

PURPOSE:To compress multilevel picture data efficiently, by performing the run length encoding in a section of a constant density level and by converting the course of the change of the density level to a peculiar code in a section where the density level rises or falls continuously. 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 the density level rises continuously and the density level difference is 7 in scanning steps 3-7, ''000'' of the change course code is assigned to them. In this section, an error code delta=10100 is added in accordance with the change of the density level difference. Since the density level 7 is continuous in the section of scanning steps 7-9, ''1100'' of the mix code is assigned to this section. In scanning steps 15- 17, the rise and the fall of the density level can be discriminated in the decoding side, and therefore, ''1'' of the discrimination code indicating the fall is added.
JP55182559A 1980-12-23 1980-12-23 Method for compression in multilevel picture data Granted JPS57106274A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55182559A JPS57106274A (en) 1980-12-23 1980-12-23 Method for compression in multilevel picture data

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55182559A JPS57106274A (en) 1980-12-23 1980-12-23 Method for compression in multilevel picture data

Publications (2)

Publication Number Publication Date
JPS57106274A true JPS57106274A (en) 1982-07-02
JPH0123033B2 JPH0123033B2 (en) 1989-04-28

Family

ID=16120383

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55182559A Granted JPS57106274A (en) 1980-12-23 1980-12-23 Method for compression in multilevel picture data

Country Status (1)

Country Link
JP (1) JPS57106274A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993002528A1 (en) * 1991-07-19 1993-02-04 Sony Corporation Coding and decoding device for time-varying image

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993002528A1 (en) * 1991-07-19 1993-02-04 Sony Corporation Coding and decoding device for time-varying image

Also Published As

Publication number Publication date
JPH0123033B2 (en) 1989-04-28

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