Image analysis – Histogram processing – For setting a threshold
Patent
1988-09-27
1992-06-16
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
341 50, 358426, 382 52, G06K 900
Patent
active
051230593
ABSTRACT:
A gradation converting circuit for converting digital input data to output data, in accordance with a predetermined input/output relationship. The input and output data is provided as data words having a predetermined number of bits "m". Since the resolution provided in the output by the "m" bits is insufficient for accurately expressing the aforementioned input/output relationship and to satisfy a demand to keep the number of bits at "m", an improved output resolution is obtained by varying the value outputted for any given input data over time such that the average of the outputs is closer to a desired output demanded by the input/output relationship. This is accomplished either by storing, for each input data, a plurality of outputs whose average is equal to the desired predetermined, input/output relationship, or, by outputting for each digital input data a so-called "decimal" value which is indicative of how often a fixed predetermined output value should be increased by one such that the average of the output should approximate the desired output value.
REFERENCES:
patent: 4498104 (1985-02-01), Schulz
patent: 4853792 (1989-08-01), Katsuta et al.
patent: 4972502 (1990-11-01), Katsuta et al.
Aragaki Masami
Hirosawa Makoto
Boudreau Leo H.
Dainippon Screen Mfg. Co,. Ltd.
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