JPS56123174A - Encoding system for half-tone picture - Google Patents

Encoding system for half-tone picture

Info

Publication number
JPS56123174A
JPS56123174A JP2714480A JP2714480A JPS56123174A JP S56123174 A JPS56123174 A JP S56123174A JP 2714480 A JP2714480 A JP 2714480A JP 2714480 A JP2714480 A JP 2714480A JP S56123174 A JPS56123174 A JP S56123174A
Authority
JP
Japan
Prior art keywords
picture
pictures
run
data
rom523
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
JP2714480A
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 JP2714480A priority Critical patent/JPS56123174A/en
Publication of JPS56123174A publication Critical patent/JPS56123174A/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

Landscapes

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

Abstract

PURPOSE:To obtain clear pictures by improving data compressibility by sampling a half-tone picture by picture elements, by successively comparing sampled values with previously stored values of a matrix of threshold levels, and by performing run-length encoding after sampling picture elements of the binary coded signal. CONSTITUTION:When half-tone picture is encoded and transfer, picture signal SCDAT501 inputted by pictures is inputted to input data buffer 506 and input data buffer 508 by turns synchronizing with clock SCCLK502. Then MH (modified Hoffman) run-length encoding ROM523 reads out of ROM523 the MH code that corresponds to the value of run-length counter circuit 521 and sends it to ROM output P-S converting circuit 524 and transmitted data output buffer circuit 525. Then, gate controller 605 samples picture element data of two lines by turns to improve the data compressibility, so that pictures of good quality will be obtained.
JP2714480A 1980-03-04 1980-03-04 Encoding system for half-tone picture Pending JPS56123174A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2714480A JPS56123174A (en) 1980-03-04 1980-03-04 Encoding system for half-tone picture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2714480A JPS56123174A (en) 1980-03-04 1980-03-04 Encoding system for half-tone picture

Publications (1)

Publication Number Publication Date
JPS56123174A true JPS56123174A (en) 1981-09-28

Family

ID=12212853

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2714480A Pending JPS56123174A (en) 1980-03-04 1980-03-04 Encoding system for half-tone picture

Country Status (1)

Country Link
JP (1) JPS56123174A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5857863A (en) * 1981-09-30 1983-04-06 Ricoh Co Ltd Picture contracting method
GB2402012A (en) * 2003-05-20 2004-11-24 Software 2000 Ltd Halftone image bitmask generation
US7025515B2 (en) 2003-05-20 2006-04-11 Software 2000 Ltd. Bit mask generation system
US8705131B2 (en) 2004-10-18 2014-04-22 Software Imaging Technology Limited Bit mask generation system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5857863A (en) * 1981-09-30 1983-04-06 Ricoh Co Ltd Picture contracting method
JPH0322751B2 (en) * 1981-09-30 1991-03-27 Ricoh Kk
GB2402012A (en) * 2003-05-20 2004-11-24 Software 2000 Ltd Halftone image bitmask generation
GB2402012B (en) * 2003-05-20 2006-02-01 Software 2000 Ltd Bit mask generation system and printer drivers and printing methods incorporating bit masks generated utilising same
US7025515B2 (en) 2003-05-20 2006-04-11 Software 2000 Ltd. Bit mask generation system
US8705131B2 (en) 2004-10-18 2014-04-22 Software Imaging Technology Limited Bit mask generation system

Similar Documents

Publication Publication Date Title
US4420771A (en) Technique for encoding multi-level signals
EP0327322A3 (en) Decoding apparatus
US4922510A (en) Method and means for variable length coding
SE8501891D0 (en) BILDOVERFORINGSSYSTEM
CA2014943A1 (en) Entropy encoder/decoder including a context extractor
JPS56123174A (en) Encoding system for half-tone picture
JPS55134576A (en) Still picture transmission system
JPS6469182A (en) Movement compensation system for variable block size
JPS5761387A (en) Encoder between frames
JPS5648737A (en) Coding-decoding device
JPS5761379A (en) Encoding or decoding device
JPS5799885A (en) Coder between frames
IL90023A0 (en) Method and system for compressing color video encoded data
JPS56102161A (en) Binary encoding circuit
JPS5737976A (en) Code converter
KR100214838B1 (en) Variable length coder
JPS5738083A (en) Orthogonal conversion decoder
JPH03125587A (en) Coder
JPS6462093A (en) Inter-frame compressing device for video signal
JPS5711576A (en) Facsimile system
JPS56143763A (en) Encoder for multilevel picture signal
JPS56143764A (en) Decoder for multilevel picture signal
JPS56165463A (en) Coding system of variable density picture
JPS51142905A (en) Run-length predicting and encoding system
JPS5761378A (en) Intermediate image band compression coding system