WO1990006032A3 - Electronic graphic arts screener - Google Patents

Electronic graphic arts screener Download PDF

Info

Publication number
WO1990006032A3
WO1990006032A3 PCT/US1989/004936 US8904936W WO9006032A3 WO 1990006032 A3 WO1990006032 A3 WO 1990006032A3 US 8904936 W US8904936 W US 8904936W WO 9006032 A3 WO9006032 A3 WO 9006032A3
Authority
WO
WIPO (PCT)
Prior art keywords
image
contone
bit
handler
screener
Prior art date
Application number
PCT/US1989/004936
Other languages
French (fr)
Other versions
WO1990006032A2 (en
Inventor
Edward Maurice Granger
John Franklin Hamilton Jr
Larry Greg Wash
Original Assignee
Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Priority to DE68928366T priority Critical patent/DE68928366T2/en
Priority to EP90900480A priority patent/EP0444135B1/en
Publication of WO1990006032A2 publication Critical patent/WO1990006032A2/en
Publication of WO1990006032A3 publication Critical patent/WO1990006032A3/en

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
    • H04N1/4055—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
    • H04N1/4058—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 with details for producing a halftone screen at an oblique angle

Abstract

A halftoning apparatus utilizes a contone line buffer (913), an image handler (930), a screen handler (950) and a font memory (970). The contone line buffer successively provides each contone value that exists within a line of an image that is to be screened. The image handler tracks the location of a current image bit being produced by the screener. The screen handler determines the correct bit, which corresponds to the image bit location, that is to be sampled within any stored halftone dot pattern in the font memory. The font memory stores a different halftone dot pattern for each different contone value. Each contone value is used to select a particular reference halftone dot pattern that is to be sampled; while the sampling coordinates are used to access a particular bit within that pattern.
PCT/US1989/004936 1988-11-16 1989-11-13 Electronic graphic arts screener WO1990006032A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE68928366T DE68928366T2 (en) 1988-11-16 1989-11-13 ELECTRONIC DEVICE FOR SEMI-TONE SCREENING GRAPHIC DOCUMENTS
EP90900480A EP0444135B1 (en) 1988-11-16 1989-11-13 Electronic graphic arts screener

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US272,568 1988-11-16
US07/272,568 US4918622A (en) 1988-11-16 1988-11-16 Electronic graphic arts screener

Publications (2)

Publication Number Publication Date
WO1990006032A2 WO1990006032A2 (en) 1990-05-31
WO1990006032A3 true WO1990006032A3 (en) 1990-07-12

Family

ID=23040361

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1989/004936 WO1990006032A2 (en) 1988-11-16 1989-11-13 Electronic graphic arts screener

Country Status (6)

Country Link
US (1) US4918622A (en)
EP (1) EP0444135B1 (en)
JP (1) JPH04501797A (en)
AT (1) ATE158912T1 (en)
DE (1) DE68928366T2 (en)
WO (1) WO1990006032A2 (en)

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Also Published As

Publication number Publication date
EP0444135A1 (en) 1991-09-04
ATE158912T1 (en) 1997-10-15
DE68928366T2 (en) 1998-04-16
DE68928366D1 (en) 1997-11-06
WO1990006032A2 (en) 1990-05-31
US4918622A (en) 1990-04-17
JPH04501797A (en) 1992-03-26
EP0444135B1 (en) 1997-10-01

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