Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1995-01-26
1998-05-12
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358443, 358457, 358466, H04N 1405
Patent
active
057519200
ABSTRACT:
A system for generating a binary representation signal, which is suitable for outputting on an output device, from a continuous toned image signal that is adapted insure local correspondence between the average value of the input signal and the output being representation signal for local spatial areas comprises a processor, an input device, an image adaptor, a summer, a dither signal generator, and a pixel activator. The image adaptor receives a reference image signal, determines the number of pixels in local areas that are to be activated and generates an adaptive signal. The summer sums a dither signal from the dither signal generator and a continuous toned image signal to generate a ditherized signal. The pixel activator receives the adaptive signal and the ditherized signal. The pixel activator generates a signal to activate the pixels in each local area that have the highest sum according to the adaptive signal. A method for generating a binary image signal from a continuous toned image signal comprises the steps of determining the mean intensity of elements in local areas of a reference image, determining the number of pixels in each local area to activate from the mean intensity, half-toning a continuous toned image signal, and generating a signal to activate pixels in each local area according to the elements that the highest half-tone intensity and the number of pixels to activate from the mean intensity.
REFERENCES:
patent: 4920501 (1990-04-01), Sullivan et al.
patent: 4958218 (1990-09-01), Katayama et al.
patent: 4958238 (1990-09-01), Katayama et al.
patent: 5111310 (1992-05-01), Parker et al.
patent: 5317418 (1994-05-01), Lin
patent: 5444551 (1995-08-01), Miller et al.
patent: 5471313 (1995-11-01), Thieret et al.
patent: 5489991 (1996-02-01), McMurray
patent: 5508822 (1996-04-01), Ulichney et al.
patent: 5535020 (1996-07-01), Ulichney et al.
Ray, Sullivan and Thomas, Simulated Annealing Applied To Correlated Digital Halftone Patterns, pp. 142-146.
Mitsa, T. and Parker, K., Digital Halftoning Technique Using a Blue-Noise Mask, J. Opt. Soc. Am. A, vol. 9, No. 11, Nov. 1992.
Ulichney, R., The Void-and-Cluster Method for Dither Array Generation, SPEI vol. 19123, Feb. 1993 pp. 332-343.
Apple Computer Inc.
Coles Sr. Edward L.
Lee Fan
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