Method and circuit for filtering signals representative of a pic

Details Method and circuit for filtering signals representative of a pic Method and circuit for filtering signals representative of a pic

1989-11-08

1990-08-07

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 27, 36472405, 36472412, G06K 900

Patent

active

049474464

ABSTRACT:
For filtering a bi-dimensional image signal in the form of data representing pixels obtained by column per column scanning of bands each having a height equal to a fraction of the height of the image, the transform of each pixel is computed in turn. For that, a convolution product using MxN coefficients is carried out on the pixels of a zone of an image, each column of each M pixels. The image is fractionated into mutually adjacent blocks each representing N columns of M pixels and the transforms of all pixels of a same block are simultaneously computed in MxN cycles by: parallel computation, during a same cycle, of all partial convolution products of only one of the filtering coefficients and of those pixels which provide a partial product which intervenes in the computation of the transforms of all pixels of the block, within a "window" of the picture which contains the block. The cycle is repeated for each coefficient in turn. All partial products obtained during the successive cycles are summed.

REFERENCES:
patent: 3872290 (1975-03-01), Crooke et al.
patent: 4644488 (1987-02-01), Nathan

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