System for producing dithered images from continuous-tone...

Details System for producing dithered images from continuous-tone... System for producing dithered images from continuous-tone...

H - Electricity

04

N

350/33

H04N 1/40 (2006.01) H04N 1/405 (2006.01)

Patent

CA 1316255

83-417 ABSTRACT OF THE DISCLOSURE A digital image processing system for converting continuous tone pixel values representing an image into halftone or dithered pixel values, with the dithered pixel values representing each pixel having fewer bits than are used to represent each pixel in the continuous tone image. The continuous tone pixel for a line of pixels is loaded into an input buffer circuit having a plurality of storage locations, with each location storing the continuous-tone values for one pixel. Iteratively, the pixel value from each location is modified by a perturbed weighted error value, and then quantized to form the output halftone or dithered pixel value. An error value is then determined which is used in processing of subsequent continuous tone pixel values. The processing of the continuous tone pixel values proceeds in a serpentine manner over the image, that is, processing of adjacent lines of the continuous tone pixel data proceeds in opposite directions.

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