Image analysis – Histogram processing – For setting a threshold
Patent
1995-12-04
1997-06-17
Chin, Wellington
Image analysis
Histogram processing
For setting a threshold
358455, 358433, 358429, 358465, 382168, 348254, H04N 1415
Patent
active
056404654
ABSTRACT:
A scanner system comprises an optical line detector for linewise, optical scanning of an original for generating a data signal in response to the grey-level received by the detector from points along a respective line. The points are sorted with associated grey-level values in groups in response to their positional origin on the original. The individual threshold values for the grey-level values are determined statistically for a plurality of zones on the original in response to the frequency of respective grey-level values in the respective zone. The threshold values of respective zones are stored in a store. The original is re-entered by linewise, optical scanning, and the data signal generated by the scanning and representing grey-levels in points along respective, entered lines is compared in a comparator with a threshold value calculated for the point concerned, and in response to this a binary, electric representation of the original is generated.
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K. Douglas Gennetten and Michael J. Steinle, "Designing a Scanner with Color Vision", Hewlett-Packard Journal, Aug., 1993, pp. 52-58.
Chin Wellington
Corrielus Jean B.
Martin Meredith L.
Siller, Jr. Gustavo
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