Programmable apparatus for determining document background level

Details Programmable apparatus for determining document background level Programmable apparatus for determining document background level

1991-12-23

1994-01-25

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358448, H04N 140

Patent

active

052820610

ABSTRACT:
An apparatus for efficiently determining the background level of an image, based upon a sampling of the image, during processing of the image signals and without the need for a prior scan operation. The apparatus includes programmable sampling counters, to indicate when image signals for background determination are present on the video path, and an image signal verification device for excluding signals which are not representative of background regions of the image. The background determination apparatus also includes arithmetic circuitry for calculating a background level based upon the sampled image signals and for determining additional threshold levels based upon the background level.

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patent: 4885784 (1989-12-01), Miyagawa et al.
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