Facsimile and static presentation processing – Natural color facsimile – Specific image-processing circuitry
Patent
1994-08-25
1995-06-20
Rogers, Scott A.
Facsimile and static presentation processing
Natural color facsimile
Specific image-processing circuitry
358534, 358536, H04N 152
Patent
active
054265193
ABSTRACT:
The present invention is a method and apparatus for processing a color document for moire-free printing, the color document including a plurality of color separations each defined with a set of image signals representing optical density with m possible density levels, while a printer is capable of rendering density with n density levels. The invention employs a spatial resolution scaler to produce m-bit signals at a spatial resolution that is a function of the halftone screen angle, base dot pitch, and desired halftone cell size. Subsequently, the m-bit signals at the desired spatial resolution (frequency and angle) are halftoned to produce n-bit signals that are printed with a raster output scanning-type printer suitable for printing at selectively variable spots per inch in both the fast and slow scan directions.
REFERENCES:
patent: 3688033 (1972-08-01), Hell et al.
patent: 3997911 (1976-12-01), Perriman et al.
patent: 4051536 (1977-09-01), Roetling
patent: 4149183 (1979-04-01), Pellar et al.
patent: 4149194 (1979-04-01), Holladay
patent: 4185304 (1980-01-01), Holladay
patent: 4499489 (1985-02-01), Gall et al.
patent: 4680645 (1987-07-01), Dispoto et al.
patent: 4868587 (1989-09-01), Loce et al.
patent: 4930023 (1990-05-01), Yakame
patent: 5014123 (1991-05-01), Imoto
patent: 5223953 (1993-06-01), Williams
patent: 5225915 (1993-07-01), Ciccone et al.
patent: 5237432 (1993-08-01), Calarco et al.
patent: 5258849 (1993-11-01), Tai et al.
Yang, Roger Yea-Dong "Method for Laying Out Halftone Screens in Color Printing Using Shifted Screens," Xerox Disclosure Journal, vol. 18, No. 4, Jul./Aug. 1993, pp. 447-450.
Genovese, Frank C. "Method to Normalize Current and Linearize Deflection in the Fist Ion System," Xerox Disclosure Journal, vol. 18, No. 2, Mar./Apr. 1993, pp. 153-159.
Basch Duane C.
Rogers Scott A.
Xerox Corporation
LandOfFree
Method and apparatus for implementing accurate angle screens does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for implementing accurate angle screens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for implementing accurate angle screens will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1848227