Method of discriminating pictures

Details Method of discriminating pictures Method of discriminating pictures

1985-07-22

1988-04-26

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 18, 382 51, 358282, 358283, G06K 934

Patent

active

047410469

ABSTRACT:
A method of discriminating pictures, wherein a picture is binary-coded. The variation in the number of foreground pixels constituting foreground pixel regions within a discrimination unit area is determined. Alternatively the variation in the distance between said foreground pixel regions is determined. It is then determined by a known relationship whether the discrimination unit area is of a dot gradation picture or not. If the picture is not a dot gradation picture, the rate of background is measured to determine whether the above discrimination unit area is of a line picture or of a continuous tone picture.

REFERENCES:
patent: 4258393 (1981-03-01), Ejiri
patent: 4403257 (1983-09-01), Hsieh
patent: 4411015 (1983-10-01), Scherl et al.
patent: 4447830 (1984-05-01), Stoffel
patent: 4447831 (1984-05-01), Adsett
patent: 4495522 (1985-01-01), Matsunawa et al.

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