Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-03-30
1989-08-08
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 10, 358101, 358139, H04N 557, H04N 1704
Patent
active
048558303
ABSTRACT:
In a video machine vision system, an apparatus compensates for varying light levels by defining a portion of the video image. A circuit is provided to measure the luminance of the video signal for the portion of the image and use that luminance to set a threshold level. The threshold level is employed in processing the image. As lighting conditions vary the luminance is re-measured causing a proportional variation in the threshold.
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Davis Wesley
Gasperi Michael L.
Allen-Bradley Company Inc.
Chin Tommy P.
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