Machine vision system with illumination variation compensation
First Claim
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1. A programmable controller for operating a machine, said controller including a vision input system comprising:
- means for receiving a video signal representing a video image of an object to be processed by the machine;
means for measuring the luminance of the video signal for a portion of said video image;
means, responsive to said means for measuring, for establishing a luminance threshold;
means for digitizing the video image by employing the luminance threshold; and
means for analyzing characteristics of the digitized image to generate data for use in operating the machine.
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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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Citations
13 Claims
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1. A programmable controller for operating a machine, said controller including a vision input system comprising:
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means for receiving a video signal representing a video image of an object to be processed by the machine; means for measuring the luminance of the video signal for a portion of said video image; means, responsive to said means for measuring, for establishing a luminance threshold; means for digitizing the video image by employing the luminance threshold; and means for analyzing characteristics of the digitized image to generate data for use in operating the machine. - View Dependent Claims (2, 3, 4, 5)
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6. A method for compensating for effects of changing lighting conditions on a video image of a machine vision system comprising:
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(a) defining a portion of the video image; (b) measuring the luminance of a video signal for the defined portion of the video image; (c) using the measured luminance to establish a luminance threshold; and (d) converting the video image to a binary video image utilizing the luminance threshold as the binarization threshold. - View Dependent Claims (7)
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8. In a video signal processing system, an apparatus compensates for effects that a temporal variation of illumination has on a video image represented by the video signal, said apparatus comprising:
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means for defining a portion of the video image; means for measuring the luminance of the video signal for the defined portion of the video image; means, responsive to said measuring means, for establishing a luminance reference level; and means for digitizing the video signal into a plurality of picture elements wherein each picture element is represented by a binary number, the value of the binary number being determined by the relationship of the luminance of the video signal to the luminance reference level. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification