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JPS57125579A - Processing method for intermediate tone picture - Google Patents

Processing method for intermediate tone picture

Info

Publication number
JPS57125579A
JPS57125579A JP56012166A JP1216681A JPS57125579A JP S57125579 A JPS57125579 A JP S57125579A JP 56012166 A JP56012166 A JP 56012166A JP 1216681 A JP1216681 A JP 1216681A JP S57125579 A JPS57125579 A JP S57125579A
Authority
JP
Japan
Prior art keywords
picture element
density
memory
noted
inputted
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
JP56012166A
Other languages
Japanese (ja)
Inventor
Tomokazu Kato
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 JP56012166A priority Critical patent/JPS57125579A/en
Priority to US06/335,417 priority patent/US4449150A/en
Priority to DE3201448A priority patent/DE3201448C2/en
Priority to DE3249633A priority patent/DE3249633C2/en
Publication of JPS57125579A publication Critical patent/JPS57125579A/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
    • H04N1/40—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
    • H04N1/4052—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 by error diffusion, i.e. transferring the binarising error to neighbouring dot decisions
    • H04N1/4053—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 by error diffusion, i.e. transferring the binarising error to neighbouring dot decisions with threshold modulated relative to input image data or vice versa

Landscapes

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

Abstract

PURPOSE:To prevent excessive scattering of high frequency component in an output picture, by compensating a difference between a density level of an objective picture element for comparison processing and a density level of corresponding output picture element, through scattering and adding the difference to the respective density level of a plurality of picture elements before comparison processing adjacent to a noted picture element. CONSTITUTION:An analog density signal of an intermediate picture is inputted to an A/D converter 100 and stored in a buffer memory 104 after quantization. The density data of noted picture element from a memory 104 is inputted to a comparison circuit 106 and a random number is also inputted. If the former value is greater than the latter, a signal of black level is outputted and if not, white signal is outputted. A differential device 110 obtains an error between the density level of a noted picture element and that of the output picture element and it is given to a multiplier 112. The multiplier 112 obtains a distributed error to the adjacent video elements of the noted picture element, and an adder 114 adds the distributed error with the density data of the corresponding picture element in the memory 104 to renew the data in the memory from the result.
JP56012166A 1981-01-19 1981-01-29 Processing method for intermediate tone picture Pending JPS57125579A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP56012166A JPS57125579A (en) 1981-01-29 1981-01-29 Processing method for intermediate tone picture
US06/335,417 US4449150A (en) 1981-01-19 1981-12-29 Method of processing medium tone picture
DE3201448A DE3201448C2 (en) 1981-01-19 1982-01-19 Method of handling a mid-tone image
DE3249633A DE3249633C2 (en) 1981-01-19 1982-01-19 Method of handling mid-tone images

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56012166A JPS57125579A (en) 1981-01-29 1981-01-29 Processing method for intermediate tone picture

Publications (1)

Publication Number Publication Date
JPS57125579A true JPS57125579A (en) 1982-08-04

Family

ID=11797847

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56012166A Pending JPS57125579A (en) 1981-01-19 1981-01-29 Processing method for intermediate tone picture

Country Status (1)

Country Link
JP (1) JPS57125579A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6074772A (en) * 1983-09-29 1985-04-27 Matsushita Electric Ind Co Ltd Quantizing method of multi-value picture information
JPS60196067A (en) * 1984-03-19 1985-10-04 Matsushita Electric Ind Co Ltd Method and device for processing picture signal
US4556918A (en) * 1982-12-27 1985-12-03 Kabushiki Kaisha Sakata Shokai Method and apparatus for generating screened halftone images
JPS6132659A (en) * 1984-07-25 1986-02-15 Matsushita Electric Ind Co Ltd Picture signal processing device
JPS6132658A (en) * 1984-07-25 1986-02-15 Matsushita Electric Ind Co Ltd Picture signal processing device
JPS6335091A (en) * 1986-07-30 1988-02-15 Nec Corp Pseudo half tone image processor
JPS6429168A (en) * 1987-07-24 1989-01-31 Matsushita Electric Ind Co Ltd Video signal processor
JPH06195471A (en) * 1985-06-19 1994-07-15 Pixar Method for point sampling of image data, method for formation of video image frame and apparatus for display of image
US7369710B2 (en) 2003-08-29 2008-05-06 Brother Kogyo Kabushiki Kaisha Image processing device, image processing method and image processing program

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4556918A (en) * 1982-12-27 1985-12-03 Kabushiki Kaisha Sakata Shokai Method and apparatus for generating screened halftone images
JPS6074772A (en) * 1983-09-29 1985-04-27 Matsushita Electric Ind Co Ltd Quantizing method of multi-value picture information
JPS60196067A (en) * 1984-03-19 1985-10-04 Matsushita Electric Ind Co Ltd Method and device for processing picture signal
JPS6132659A (en) * 1984-07-25 1986-02-15 Matsushita Electric Ind Co Ltd Picture signal processing device
JPS6132658A (en) * 1984-07-25 1986-02-15 Matsushita Electric Ind Co Ltd Picture signal processing device
JPH06195471A (en) * 1985-06-19 1994-07-15 Pixar Method for point sampling of image data, method for formation of video image frame and apparatus for display of image
JPS6335091A (en) * 1986-07-30 1988-02-15 Nec Corp Pseudo half tone image processor
JPS6429168A (en) * 1987-07-24 1989-01-31 Matsushita Electric Ind Co Ltd Video signal processor
US7369710B2 (en) 2003-08-29 2008-05-06 Brother Kogyo Kabushiki Kaisha Image processing device, image processing method and image processing program

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