Method and system for reproducing monochromatic and color images

Details Method and system for reproducing monochromatic and color images Method and system for reproducing monochromatic and color images

1990-02-26

1991-07-09

Shoop, Jr., William M.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358457, 358 75, H04N 123, H04N 140, H04N 146

Patent

active

050310500

ABSTRACT:
A method and system for color and monochromatic printing wherein ordered dither and error diffusion processes are combined to provide high quality printed images with good spatial resolution, good gray scale transitions, good low frequency and high frequency responses and a high computational speed. Using this process, gray scale numbers representative of a scanned image are summed for each super pixel of the scanned image and divided by a chosen gray level normalizing factor. This division operation is done to obtain a normalized ordered dither quotient number of drops (dots) to be printed in super pixels and to further obtain an error remainder number of dots to be dispersed to surrounding super pixels. The normalized ordered dither quotient number of dots are printed in pre-assigned individual pixels within printed super pixels, and the error remainder number of drops are diffused to other pre-assigned surrounding or adjacent super pixels. In this manner, a combination of ordered dither and error diffusion signal processing and printing is achieved to simultaneously take advantage of some of the best characteristics of both types of signal processing printing. In color printing, the above operation is carried out in each of a plurality of separate color planes, and all of the quotient information is retained and printed in a predetermined priority sequence for each color plane.

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Fundamentals of Interactive Computer Graphics by Foley and Van Dam, pp. 597-602.
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Wood and Steinberg, An Adaptive Algorithm for Spatial Greyscale, Proceedings of the Society of Information Display, vol. 17/2, 1976, pp. 75-77.
B. M. Dawson, Introduction to Image Processing Algorithms, Byte Magazine, Mar. 1987, pp. 169-186.
Dispoto, Mather and Myer, Designer's Guide to Raster Image Printer Algorithms, Hewlett-Packard Company, First Edition, Dec. 1986.

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