System for generating line drawing of a scanned image

Details System for generating line drawing of a scanned image System for generating line drawing of a scanned image

1977-07-07

1979-03-06

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

364515, H04N 122, H04N 514, H04N 579

Patent

active

041434013

ABSTRACT:
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 digitized. 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 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.

REFERENCES:
patent: 3249690 (1966-05-01), Schubert
patent: 3294896 (1966-12-01), Young, Jr.

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