Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1995-01-30
1996-09-10
Rogers, Scott A.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358457, 358460, 358466, H04N 140, H04N 1405
Patent
active
055551025
ABSTRACT:
A system for producing a set of dither matrix signals having local correlation comprises a processor, an input device, a display device, a hard output device, an incremental threshold generator, a pattern generator, an optimizer, a dither matrix storage, and a pixel activator. The incremental threshold generator determines a maximum tolerable error and generates an incremental threshold signal. The maximum tolerable error is the greatest tolerable variation between dither matrices for adjacent gray levels. The incremental threshold signal controls the transition of cells of dither matrices for adjacent gray levels. The pattern generator receives the incremental threshold signal and a dither matrix signal for the previous gray level and generates the possible pattern signals based on a dither matrix signal for an adjacent gray level and the incremental threshold signal. The optimizer receives the possible pattern signals, selects the pattern signal that introduces the least error into the output image, and stores the pattern signal in the dither matrix storage as the dither matrix signal for the gray level. The pixel activator uses the set of dither matrix signals to generate an output image. A method for generating a set of dither matrix signals having local correlation includes the steps of receiving a local correlation signal, determining a maximum tolerable error, generating an incremental threshold signal, and modifying a first dither matrix signal according to the incremental threshold signal to produce a second dither matrix signal.
REFERENCES:
patent: 4920501 (1990-04-01), Sullivan et al.
patent: 5111310 (1992-05-01), Parker et al.
patent: 5150428 (1992-09-01), Leone et al.
patent: 5214517 (1993-05-01), Sullivan et al.
patent: 5317418 (1994-05-01), Lin
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, SPIE vol. 19123, Feb. 1993, pp. 33-343.
Apple Computer Inc.
Heafey Michael F.
Rogers Scott A.
Sueoka Greg T.
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