Machine vision system with illumination variation compensation

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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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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Article "Video-Level Adjustment for Optical Scanners", R. D. Keillor, et al., Aug. 1970, IBM Technical Disclosure Bulletin, vol. 13, No. 3, pp. 697-698.

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