Spatial filter system

Details Spatial filter system Spatial filter system

1989-12-12

1991-01-08

Doudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

36472405, 36472412, 382 6, G06K 936

Patent

active

049842862

ABSTRACT:
A digital spatial filter system includes means for separating an image formed of a matrix of pixels into four regularly distributed interleaved subimages from alternate rows and columns of the matrix pixels; means for convolving each of the four subimages with two orthogonal unidimensioanal, vectors of a convolving kernel to produce four filtered subimages; and means for recombining said convolved four filtered subimages into the original image filtered.

REFERENCES:
patent: 3914788 (1975-10-01), Niehaus
patent: 4020463 (1977-04-01), Himmel
patent: 4862403 (1989-08-01), Iwase et al.
Nussbaumer, "Digital Filtering by Complex Polynomial Transforms" IBM Tech. Disclosure Bulletin, vol. 20, No. 9, Feb. 1978, pp. 3521-3522.

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