CA2442100A1 - Digital halftoning - Google Patents

Digital halftoning Download PDF

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Publication number
CA2442100A1
CA2442100A1 CA002442100A CA2442100A CA2442100A1 CA 2442100 A1 CA2442100 A1 CA 2442100A1 CA 002442100 A CA002442100 A CA 002442100A CA 2442100 A CA2442100 A CA 2442100A CA 2442100 A1 CA2442100 A1 CA 2442100A1
Authority
CA
Canada
Prior art keywords
halftone
pixels
dots
pair
halftone dots
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
CA002442100A
Other languages
French (fr)
Other versions
CA2442100C (en
Inventor
Daniel P. Bybell
Jay E. Thornton
Dana F. Schuh
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.)
Intellectual Ventures I LLC
Original Assignee
Daniel P. Bybell
Jay E. Thornton
Dana F. Schuh
Polaroid Corporation
Primary Pdc, Inc.
Senshin Capital, Llc
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 Daniel P. Bybell, Jay E. Thornton, Dana F. Schuh, Polaroid Corporation, Primary Pdc, Inc., Senshin Capital, Llc filed Critical Daniel P. Bybell
Publication of CA2442100A1 publication Critical patent/CA2442100A1/en
Application granted granted Critical
Publication of CA2442100C publication Critical patent/CA2442100C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40Picture signal circuits
    • H04N1/405Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
    • H04N1/4055Halftoning, 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
    • H04N1/4056Halftoning, 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 varying in one dimension only, e.g. dash length, pulse width modulation [PWM]

Abstract

In one aspect of the present invention, a method is provided for producing a halftone of a source image. The halftone includes halftone pixels. The halftone pixels are suitable for containing halftone dots. The method selects glyphs corresponding to intensities of regions (e.g., pixels) in the source image. The glyphs contain one or more halftone dots. The method located halftone dots within the halftone pixels such that for at least one pair of halftone dots contained within a pair of halftone pixels sharing a common boundary, the halftone dots in the pair of halftone pixels extend in opposite directions form the common boundary.
CA002442100A 2001-03-27 2002-03-21 Digital halftoning Expired - Fee Related CA2442100C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/817,932 2001-03-27
US09/817,932 US6999202B2 (en) 2001-03-27 2001-03-27 Method for generating a halftone of a source image
PCT/US2002/008954 WO2002078320A2 (en) 2001-03-27 2002-03-21 Digital halftoning

Publications (2)

Publication Number Publication Date
CA2442100A1 true CA2442100A1 (en) 2002-10-03
CA2442100C CA2442100C (en) 2007-06-19

Family

ID=25224235

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002442100A Expired - Fee Related CA2442100C (en) 2001-03-27 2002-03-21 Digital halftoning

Country Status (5)

Country Link
US (2) US6999202B2 (en)
EP (1) EP1374557A2 (en)
JP (2) JP2004530344A (en)
CA (1) CA2442100C (en)
WO (1) WO2002078320A2 (en)

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WO2002078320A2 (en) 2002-10-03
JP2004530344A (en) 2004-09-30
CA2442100C (en) 2007-06-19
US6999202B2 (en) 2006-02-14
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US20020159094A1 (en) 2002-10-31

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