Image analysis – Histogram processing – For setting a threshold
Patent
1992-08-10
1995-01-24
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
356394, 364552, 382 50, 382 57, G06K 936
Patent
active
053848594
ABSTRACT:
Individual printed image elements from an image to be inspected are allotted individual nominal ink density values, as by scanning an ideal printed sheet by a CCD matrix camera. The ideal values are stored in a main memory having segments for average, or grey, values for each image element. A multiplicity of proof images are scanned, and their density values measured and stored for each proof judged acceptable by an inspector. Thereafter, the variations in the acceptable proof density values are stored in the main memory as maximum and minimum acceptable deviations from the initial nominal values for each individual image element to provide a subjective tolerance value for the nominal density values in the main memory.
REFERENCES:
"Image Analysis Algorithm for Detection Defects in Repetitive Patterns" vol. 24, No. 85, Apr. 1991, Havant GB.
Sobey et al., "Detection and Sizing Visual Features in Wood Using Total Measures and a Classification Algorithm", vol. 22, No. 4, 1989 Elmsford, N.Y. US.
Patent Abstract of Japan, JP60124783, Meidensha KK, "Picture Processing Unit", Nov. 12, 1985.
Patent Abstract of Japan, JP2252392, Ricoh Co. Ltd., "Picture Quality Evaluating Method", Dec. 12, 1990.
Bolza-Schunemann Claus A.
Schaede Johannes G.
Boudreau Leo H.
Koenig & Bauer, Akteingesellschaft
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