WO2002078320A3 - Digital halftoning - Google Patents

Digital halftoning Download PDF

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Publication number
WO2002078320A3
WO2002078320A3 PCT/US2002/008954 US0208954W WO02078320A3 WO 2002078320 A3 WO2002078320 A3 WO 2002078320A3 US 0208954 W US0208954 W US 0208954W WO 02078320 A3 WO02078320 A3 WO 02078320A3
Authority
WO
WIPO (PCT)
Prior art keywords
halftone
pixels
dots
pair
halftone dots
Prior art date
Application number
PCT/US2002/008954
Other languages
French (fr)
Other versions
WO2002078320A2 (en
Inventor
Daniel P Bybell
Jay E Thornton
Dana F Schuh
Original Assignee
Polaroid Corp
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 Polaroid Corp filed Critical Polaroid Corp
Priority to JP2002576414A priority Critical patent/JP2004530344A/en
Priority to CA002442100A priority patent/CA2442100C/en
Priority to EP02719326A priority patent/EP1374557A2/en
Publication of WO2002078320A2 publication Critical patent/WO2002078320A2/en
Publication of WO2002078320A3 publication Critical patent/WO2002078320A3/en

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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
    • H04N1/4055—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
    • H04N1/4056—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 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.
PCT/US2002/008954 2001-03-27 2002-03-21 Digital halftoning WO2002078320A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2002576414A JP2004530344A (en) 2001-03-27 2002-03-21 Digital halftoning
CA002442100A CA2442100C (en) 2001-03-27 2002-03-21 Digital halftoning
EP02719326A EP1374557A2 (en) 2001-03-27 2002-03-21 Digital halftoning

Applications Claiming Priority (2)

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

Publications (2)

Publication Number Publication Date
WO2002078320A2 WO2002078320A2 (en) 2002-10-03
WO2002078320A3 true WO2002078320A3 (en) 2003-03-20

Family

ID=25224235

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/008954 WO2002078320A2 (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)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE42473E1 (en) 2001-05-30 2011-06-21 Senshin Capital, Llc Rendering images utilizing adaptive error diffusion
USRE43149E1 (en) 2001-03-27 2012-01-31 Senshin Capital, Llc Method for generating a halftone of a source image

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US20220072802A1 (en) * 2019-05-29 2022-03-10 Hewlett-Packard Development Company, L.P. Color surface formation by single-color 3d printing

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USRE43149E1 (en) 2012-01-31
CA2442100A1 (en) 2002-10-03
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