Slice level deciding circuit

Details Slice level deciding circuit Slice level deciding circuit

1985-10-02

1987-06-09

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

358282, G06K 938

Patent

active

046726829

ABSTRACT:
A slice level deciding circuit includes a slice level generator for generating a variable slice level and a comparator for comparing a slice level generated from the generator with a picture image signal. An optimum slice level can be provided by operating, via an arithmetic circuit, a prescribed value on the same slice level as generated from the generator when an output from the comparator satisfies a prescribed slice level deciding condition. Accordingly, deterioration of a picture image quality can be prevented, which is caused by changes of a quantity of light due to variations of ambient temperature around the light source used for obtaining a picture image signal from the readout medium and noise produced upon reading portions on the readout medium where a quantity of light from the light source is reduced.

REFERENCES:
patent: 4481666 (1984-11-01), Niwa
patent: 4525747 (1985-06-01), Sakai et al.
patent: 4539600 (1985-09-01), Takahashi et al.
patent: 4562486 (1985-12-01), Suzuki et al.

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