Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1993-05-11
1994-05-31
Powell, Mark R.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358457, 358455, G03F 308
Patent
active
053174186
ABSTRACT:
A method of generating a halftone image from a grey scale image by means of a dither matrix. The matrix includes many patterns Each pattern corresponds to one grey level of the grey scale image. The value of each element in each pattern depends on a special positive filter with a single peak and a region-of-support. The peak is approximately at the center of the region-of-support. One preferred filter is a guassian filter. For a given pattern, the region-of-support of the filter depends on the average separation of the elements with values equal to one in that pattern; and the elements with values equal to one are substantially uniformly distributed across the pattern.
REFERENCES:
patent: 4532651 (1985-06-01), Pennebaker, Jr.
patent: 4736254 (1988-04-01), Kotera
patent: 5027078 (1991-06-01), Fan
patent: 5053887 (1991-10-01), Thompson
patent: 5107346 (1992-04-01), Bowers
patent: 5111310 (1992-05-01), Parker et al.
Floyd et al.; "An Adaptive Algorithm for Spatical Greyscale", Proceedings of the Society for Information Display, vol. 17, 1986, pp. 75-77.
Ulichney; "The Void-and-Cluster Method for Dither Array Generation", SPIE/IS&T Symposium on Electronic Imaging Science and Technology, San Jose, California 1993.
Hewlett--Packard Company
Ning John
Powell Mark R.
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