H - Electricity – 04 – N
Patent
H - Electricity
04
N
178/3.1
H04N 5/14 (2006.01) G06T 9/20 (2006.01)
Patent
CA 1110547
SYSTEM FOR GENERATING LINE DRAWING OF A SCANNED IMAGE ABSTRACT OF THE DISCLOSURE A digital circuit for detecting changes in the gray scale of scanned images is disclosed. Each line of video information produced by scanning the image is digi- tized. Each digital sample is compared to digital samples delayed a predetermined amount to generate a difference signal which is indicative of a change in the gray scale having a component perpendicular to the direction of scan. me digitized samples of the video signal are also stored in a memory having a capacity sufficient to store data representing a plurality of scan lines with a typical memory having a capacity for storing digital information representing eight scan lines. Selected digital samples from the stored data are compared to samples of the line being scanned to detect changes in the gray scale having a component parallel to the direction of scan. These detected changes in the gray scale are combined to generate a signal which operates a printer to generate a line drawing of the scanned image.
305858
Mcconnell And Fox
Westinghouse Electric Corporation
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