Machine vision system with illumination variation compensation
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United States of America Patent
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-
Aug 8, 1989
Grant Date -
N/A
app pub date -
Mar 30, 1987
filing date -
Mar 30, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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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Cited Art Landscape
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