Method for enhancing image data by noise reduction or sharpening

Details Method for enhancing image data by noise reduction or sharpening Method for enhancing image data by noise reduction or sharpening

1987-12-04

1988-11-08

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 27, 382 55, 358166, G06K 940, G06K 944

Patent

active

047838400

ABSTRACT:
An image enhancing process promotes either noise reduction or image sharpening on a pixel-by-pixel basis as a function of the recognition of specific patterns of sampled pixel values surrounding each pixel to be enhanced. The sampled pixel values are divided into two or more subgroups and the enhanced pixel value is provided to promote either image sharpening or noise reduction as a function of the number of pixel values in the different subgroups and their positions relative to each other in the subgroups.

REFERENCES:
patent: 4003024 (1977-01-01), Riganati et al.
patent: 4290049 (1981-09-01), Sternberg et al.
patent: 4311914 (1982-01-01), Huber
patent: 4520505 (1985-05-01), Yamamoto et al.
patent: 4541116 (1985-09-01), Lougheed
patent: 4663655 (1987-05-01), Freeman
patent: 4691366 (1987-09-01), Fenster et al.
patent: 4724544 (1988-02-01), Matsumoto

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