Image analysis – Histogram processing – For setting a threshold
Patent
1982-12-08
1986-01-21
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 50, 382 51, 382 52, G06K 920
Patent
active
045661251
ABSTRACT:
An apparatus and method for locating a pattern within a digital representation of an image. A video camera scans an image of light reflected from the surface of an object. The analog output of the video camera is digitized to form the digital representation. In order to digitize the analog output a threshold signal is provided. A comparator receives both the threshold signal and the analog output. When the difference between the threshold signal and analog exceeds a certain value the comparator changes its output from one digital level to another until the difference is less than the certain value. The threshold signal is produced by an adaptive threshold circuit which integrates the analog output over one scan of the image to form an integrated signal. This integrated signal is the normalized and stored into a sample and hold circuit for use in a subsequent scan as the threshold signal.
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Boudreau Leo H.
Demond Thomas W.
Heiting Leo N.
Mancuso Joseph
Sharp Melvin
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