JPS57190461A - Encoding system for half tone picture - Google Patents

Encoding system for half tone picture

Info

Publication number
JPS57190461A
JPS57190461A JP56073476A JP7347681A JPS57190461A JP S57190461 A JPS57190461 A JP S57190461A JP 56073476 A JP56073476 A JP 56073476A JP 7347681 A JP7347681 A JP 7347681A JP S57190461 A JPS57190461 A JP S57190461A
Authority
JP
Japan
Prior art keywords
scanning line
picture element
mode
block
encode
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
JP56073476A
Other languages
Japanese (ja)
Inventor
Yuzo Omiya
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP56073476A priority Critical patent/JPS57190461A/en
Publication of JPS57190461A publication Critical patent/JPS57190461A/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 encode scanning lines by noticing that the correlation between scanning lines of a half tone pictur is intensified, so as to divide a picture element with the density as the scanning line just before the one whose encoding has been already completed a scanning line to be encoded into blocks to encode it in every continuous block. CONSTITUTION:After completing initializing in every block, a picture element CP(I) of an encoding scanning line and a picture element HP (I) of a reference scanning line are inputted in every picture element. The picture element HP (I) is compared with the one HP (I-1) just before the HP (I) to detect a block division and add the block size and the picture element CP (I) is compared with the one CP (I-1) just before the CP (I) to calculate the difference of picture elements in the block, store the difference in a RAM and determine the mode. When the HP (I) is different from the HP (I-1), reading of picture elements is suspended once to discriminate the mode, encode a scanning line and output the encoded scanning line. The mode is discriminated by referring a mode selecting register and, in case of a skip mode S and a non-skip mode D, the discrimination code ''0'' and ''1'' are outputted respectively to a buffer 15.
JP56073476A 1981-05-18 1981-05-18 Encoding system for half tone picture Pending JPS57190461A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56073476A JPS57190461A (en) 1981-05-18 1981-05-18 Encoding system for half tone picture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56073476A JPS57190461A (en) 1981-05-18 1981-05-18 Encoding system for half tone picture

Publications (1)

Publication Number Publication Date
JPS57190461A true JPS57190461A (en) 1982-11-24

Family

ID=13519362

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56073476A Pending JPS57190461A (en) 1981-05-18 1981-05-18 Encoding system for half tone picture

Country Status (1)

Country Link
JP (1) JPS57190461A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4729034A (en) * 1985-06-27 1988-03-01 Netexpress Systems, Inc. Method and apparatus for selection of a coding reference line for two-dimensional coding of image data representing screened images
US4794461A (en) * 1986-09-10 1988-12-27 Netexpress Systems, Inc. Method and apparatus for block coding vertical mode codes for enhanced compression of image data

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4729034A (en) * 1985-06-27 1988-03-01 Netexpress Systems, Inc. Method and apparatus for selection of a coding reference line for two-dimensional coding of image data representing screened images
US4794461A (en) * 1986-09-10 1988-12-27 Netexpress Systems, Inc. Method and apparatus for block coding vertical mode codes for enhanced compression of image data

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