Image analysis – Histogram processing – For setting a threshold
Patent
1988-12-27
1990-07-10
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
382 53, G06K 938
Patent
active
049411888
ABSTRACT:
An image signal processing apparatus has an optical system including an image sensor, a comparator for comparing the density level of a current line with that of a previous line as a predicted value, a CPU for determining a threshold level in a different mode in accordance with the result obtained by the comparator, and another comparator for comparing the current image signal with the threshold value from the CPU to produce a binary encoded signal. The apparatus properly discriminates background and information portions of an original image and performs binary encoding of image signals in real time without requiring a large-capacity memory.
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Digital Image Processing by William K. Pratt, John Wiley & Sons, N.Y., 1978, pp. 644-657.
Boudreau Leo H.
Canon Kabushiki Kaisha
Couso Jose L.
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