Directional running average segmentation

Details Directional running average segmentation Directional running average segmentation

1991-08-08

1993-09-14

Couso, Jose L.

Image analysis

Histogram processing

For setting a threshold

382 52, G06K 920

Patent

active

052456773

ABSTRACT:
In a video based image recognition system, an adaptive threshold level for each pixel is set based upon a running horizontal and/or running vertical average of the pixel intensities combined with suppression of the running average threshold computation to hold the threshold value constant upon the detection of pixels with an intensity above the threshold, and continuing until the detection of a pixel having an intensity lower than the held constant value. After the edge of an image has been detected, and thereafter upon detecting the first pixel having an intensity less than the held threshold, a formula uses a particular combination of pixel location values to compute an intermediate running average value, after which the normal running average is computed. One possible configuration of a system embodying the segmentation process includes within a block diagram a noise calculation block (41), a multiplication block (43), a running average calculation block (45), a summing junction (47), pixel delay block (49), a pair of comparators (51) and (53).

REFERENCES:
patent: 4597009 (1986-06-01), Ballmer et al.
patent: 4850029 (1989-07-01), Moyer et al.
patent: 4903316 (1990-02-01), Hongo et al.
patent: 5086484 (1992-02-01), Katayama et al.

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