JPS5776560A - Processing method of intermediate tone image - Google Patents

Processing method of intermediate tone image

Info

Publication number
JPS5776560A
JPS5776560A JP55151478A JP15147880A JPS5776560A JP S5776560 A JPS5776560 A JP S5776560A JP 55151478 A JP55151478 A JP 55151478A JP 15147880 A JP15147880 A JP 15147880A JP S5776560 A JPS5776560 A JP S5776560A
Authority
JP
Japan
Prior art keywords
image
brightness
black
white
tone
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
JP55151478A
Other languages
Japanese (ja)
Other versions
JPH0219669B2 (en
Inventor
Naoto Kawamura
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP55151478A priority Critical patent/JPS5776560A/en
Publication of JPS5776560A publication Critical patent/JPS5776560A/en
Priority to US06/583,294 priority patent/US4491875A/en
Publication of JPH0219669B2 publication Critical patent/JPH0219669B2/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
    • H04N1/40087—Multi-toning, i.e. converting a continuous-tone signal for reproduction with more than two discrete brightnesses or optical densities, e.g. dots of grey and black inks on white paper
    • 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
    • H04N1/4055—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern
    • H04N1/4057—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern the pattern being a mixture of differently sized sub-patterns, e.g. spots having only a few different diameters

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Laser Beam Printer (AREA)

Abstract

PURPOSE:To obtain an intermediate tone image of a high tone wedge and high image solution, by forming an image element by forming the micro image elements with brightness of >=3 steps of black, white and the intermediate value between the black and white respectively into a matrix form. CONSTITUTION:A comparison is carried out among a dither matrix of micro image elements of 2X2, etc. based on the equationIin the brightness of white and the intermediate value between white and black, an micro image element dither matrix based on the equation II in the brightness of the intermediate value and black and a matrix of the image information formed with the micro image elements respectively. Thus the brightness is decided in accordance with the 3 steps of black, white and the intermediate value of the black and the white for a dither micro image element matrix 11-of 2X2, etc. that form an image element 10 forming an image. Accordingly an intermediate tone image of a high tone wedge and high image resolution is obtained with use of dither matrix image elements of a number of levels of brightness of 2X(2X2)+1 tone wedges in comparison with 2X2+1 tone wedges in the brightness of 2 steps.
JP55151478A 1980-10-30 1980-10-30 Processing method of intermediate tone image Granted JPS5776560A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP55151478A JPS5776560A (en) 1980-10-30 1980-10-30 Processing method of intermediate tone image
US06/583,294 US4491875A (en) 1980-10-30 1984-02-28 Apparatus and method for tonal image processing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55151478A JPS5776560A (en) 1980-10-30 1980-10-30 Processing method of intermediate tone image

Publications (2)

Publication Number Publication Date
JPS5776560A true JPS5776560A (en) 1982-05-13
JPH0219669B2 JPH0219669B2 (en) 1990-05-02

Family

ID=15519377

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55151478A Granted JPS5776560A (en) 1980-10-30 1980-10-30 Processing method of intermediate tone image

Country Status (1)

Country Link
JP (1) JPS5776560A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0224167A (en) * 1988-05-20 1990-01-26 Xerox Corp Method of regenerating middle tone picture

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5583066A (en) * 1978-12-17 1980-06-23 Ricoh Co Ltd Function generator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5583066A (en) * 1978-12-17 1980-06-23 Ricoh Co Ltd Function generator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0224167A (en) * 1988-05-20 1990-01-26 Xerox Corp Method of regenerating middle tone picture

Also Published As

Publication number Publication date
JPH0219669B2 (en) 1990-05-02

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