Method of automatically extracting a contrasting object in a dig

Details Method of automatically extracting a contrasting object in a dig Method of automatically extracting a contrasting object in a dig

1987-07-29

1989-02-28

Blum, Theodore M.

Image analysis

Histogram processing

For setting a threshold

G06K 938

Patent

active

048093491

ABSTRACT:
Method for extracting a contrasting object in a digital image. The method estimates a threshold S.sub.1 for each picture element, corresponding to a background estimation threshold representing an image contrast. A local contrast function GR(i,j) is determined as a recursive gradient proportional to the difference between the average of a video signal on the line of each picture element, and a function of the averages of the estimated background contrasts and picture elements located on an identical line or a previous line. Using the local contrast function, an estimated background value for each element is determined by comparing the contrast function to the threshold. The difference is taken between the video signal and the estimated background. The result of this difference is compared to a second decision threshold to determine whether or not the picture element belongs to the contrasting object.

REFERENCES:
patent: 4220972 (1980-09-01), Geokezas et al.
patent: 4661849 (1987-04-01), Hinman
patent: 4719584 (1988-01-01), Rue et al.

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