JPS5760772A - Picture processing device - Google Patents

Picture processing device

Info

Publication number
JPS5760772A
JPS5760772A JP55135619A JP13561980A JPS5760772A JP S5760772 A JPS5760772 A JP S5760772A JP 55135619 A JP55135619 A JP 55135619A JP 13561980 A JP13561980 A JP 13561980A JP S5760772 A JPS5760772 A JP S5760772A
Authority
JP
Japan
Prior art keywords
picture
output
quantizer
integrator
accordance
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
JP55135619A
Other languages
Japanese (ja)
Other versions
JPH0217982B2 (en
Inventor
Tomokazu Kato
Kan Oteru
Shuji Hashimoto
Yukio Sato
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP55135619A priority Critical patent/JPS5760772A/en
Publication of JPS5760772A publication Critical patent/JPS5760772A/en
Publication of JPH0217982B2 publication Critical patent/JPH0217982B2/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
    • H04N1/40—Picture signal circuits
    • H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
    • H04N1/4051—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a dispersed dots halftone pattern, the dots having substantially the same size

Landscapes

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

Abstract

PURPOSE:To suppress moire and degradation of the picture quality simultaneously, by recognizing the pattern of an object picture and by controlling dispersion of threshold random numbers in accordance with the recognition result. CONSTITUTION:An input picture signal is stored in a shift register 1 for buffer, and by the output of an integrator 2 for difference absolute value, a random number generator 3 is controlled to lessen dispersion of generated random numbers if the peripheral part including a noticed picture element of an original picture is a line drawing. Further, switching of switches 8 and 10 is controlled in accordance with the output of a quantizer 7, which makes data binary by the output level of the integrator 2, to cut outputs of correcting signal generators 6 and 14 for a character or line drawing part, thus reproducing the original picture faithfully. Next, thresholds generated at random from the generator 3 are given to a quantizer 12 to execute binary conversion of the picture signal with the edge emphasized.
JP55135619A 1980-09-29 1980-09-29 Picture processing device Granted JPS5760772A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55135619A JPS5760772A (en) 1980-09-29 1980-09-29 Picture processing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55135619A JPS5760772A (en) 1980-09-29 1980-09-29 Picture processing device

Publications (2)

Publication Number Publication Date
JPS5760772A true JPS5760772A (en) 1982-04-12
JPH0217982B2 JPH0217982B2 (en) 1990-04-24

Family

ID=15156034

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55135619A Granted JPS5760772A (en) 1980-09-29 1980-09-29 Picture processing device

Country Status (1)

Country Link
JP (1) JPS5760772A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6449061B2 (en) * 1997-09-23 2002-09-10 Xerox Corporation System and method for providing dynamic noise profile selection for hybrid and error diffusion image processing

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5396616A (en) * 1977-01-31 1978-08-24 Dacom Inc Facsimile having analog signalltoobinary signal converter
JPS5580958A (en) * 1978-12-15 1980-06-18 Toshiba Corp Picture signal binary coding system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5396616A (en) * 1977-01-31 1978-08-24 Dacom Inc Facsimile having analog signalltoobinary signal converter
JPS5580958A (en) * 1978-12-15 1980-06-18 Toshiba Corp Picture signal binary coding system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6449061B2 (en) * 1997-09-23 2002-09-10 Xerox Corporation System and method for providing dynamic noise profile selection for hybrid and error diffusion image processing

Also Published As

Publication number Publication date
JPH0217982B2 (en) 1990-04-24

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