Automatic multimode continuous halftone line copy reproduction

Details Automatic multimode continuous halftone line copy reproduction Automatic multimode continuous halftone line copy reproduction

G - Physics

03

G

314/7

G03G 15/00 (2006.01) H04N 1/40 (2006.01) H04N 1/405 (2006.01)

Patent

CA 1130364

ABSTRACT OF THE DISCLOSURE An image data handling system to automatically detect and segregate from a stream of image pixels high frequency half-tone image input, continuous tone image input, low fre- quency half-tone image input, and line image input which may be present in the pixel stream. The image pixels are first autocorrelated in accordance with a predetermined algorithm to detect if high frequency half-tone image data is present. Data of this type found is processed by first descreening and then rescreening at a lower frequency to provide binary level pixels. The pixel stream is analyzed for the presence of con- tinuous tone image data. Where found, such data is processed by a template screening process to provide binary level pixels. Remaining pixels comprising low frequency half-tone and line copy image data are thresholded to provide binary level pixels.

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