H - Electricity – 04 – N
Patent
H - Electricity
04
N
178/3.1
H04N 1/036 (2006.01) G06T 5/00 (2006.01)
Patent
CA 1116533
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. The digitized samples of the video signal are also stored in a memory having a capacity sufficient to store data repre- senting a plurality of scan lines with a typical memory having a capacity for storing digital information repre- senting 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 changes in the gray scale are combined to generate a signal indicative of the central portion of the change in the gray scale of the image being scanned to drive a printer to generate a line drawing with the position of the lines corresponding to the central portion of the changes in gray scale of the scanned image.
309309
Mcconnell And Fox
Westinghouse Electric Corporation
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