Optical reader head with video compensation method and circuit

Details Optical reader head with video compensation method and circuit Optical reader head with video compensation method and circuit

G - Physics

06

K

352/32.4

G06K 7/14 (2006.01) H04N 1/028 (2006.01) H04N 1/40 (2006.01) H04N 1/401 (2006.01) H04N 1/403 (2006.01)

Patent

CA 1324214

Abstract Of The Disclosure An optical reader head with a video compensation circuit for use in high speed document reading. The reader head utilizes small focussed bulbs to illuminate the scanning line, with the head being comprised of first and second body sections housing a lens which focusses the light reflected from a document at the scanning line to a light array comprised of 256 sensors. Light from four adjacent sensors along the scanning line is integrated to produce a composite pixel which becomes one of 64 such composite pixels for a scanning line of data. A peak comparison PROM is used for adjusting document background levels, for example, for use in thresholding the pixel data. A special test circuit is used to insure accurate focussing of the lens.

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