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US Patent 5029107 - Apparatus and accompanying method for converting a bit mapped monochromatic image to a grey scale image using table look up operations

US Patent Issued on July 2, 1991
Estimated Patent Expiration Date: Icon_subject March 31, 2009Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
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Abstract

Apparatus and an accompanying method for converting a relatively high resolution halftone bit-mapped monochromatic document, such as illustratively a halftone separation which exists in a CDPF print file, into a relatively low resolution continuous tone grey scale document which, when the latter is applied to a display screen of a video monitor having appropriate grey scale capability, would provide a readable displayed page, i.e. a "preview", that approximately depicts how the bit-mapped document would appear when printed.

Other References

  • G. Goertzel et al., "Digital Halftoning on the IBM 4250 Printer", IBM Journal of Research and Developing, vol. 31, No. 1, Jan. 1987, pp. 2-1

Inventor

Assignee

Application

No. 331485 filed on 03/31/1989

US Classes:

345/698, Adjusting display pixel size or pixels per given area (i.e., resolution)345/589Color or intensity

Examiners

Primary: Harkcom, Gary V.
Assistant: Nguyen, Phu K.

Attorney, Agent or Firm

US Patent References

4084196, Electronic half-tone generating means for facsimile reproduction system
Issued on: 04/11/1978
Inventor: Tisue, et al.
4210936, Method and apparatus for reproducing an original gray scale image
Issued on: 07/01/1980
Inventor: Cinque ,   et al.
4486785, Enhancement of video images by selective introduction of gray-scale pels
Issued on: 12/04/1984
Inventor: Lasher ,   et al.
4533942, Method and apparatus for reproducing an image which has a coarser resolution than utilized in scanning of the image
Issued on: 08/06/1985
Inventor: Gall ,   et al.
4630125, Unscreening of stored digital halftone images
Issued on: 12/16/1986
Inventor: Roetling
4672559, Method for operating a microscopical mapping system
Issued on: 06/09/1987
Inventor: Jansson ,   et al.
4855933Line figure connecting apparatus
Issued on: 08/08/1989
Inventor: Kondo

International Class

G06K 015/00

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