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Image Analysis

Directional-running-average-segmentation

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Directional running average segmentation

Details

Inventors: Lepore, Robert G.; Braunreiter, Dennis C.;
Assignee: Hughes Aircraft Company (Los Angeles, CA)
Primary Examiner: Couso; Jose L.
Assistant Examiner:
Attorney, Agent or Firm: Brown; Charles D., Heald; Randall M., Denson-Low; W. K.

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).

DETAILED DESCRIPTION In accordance with the teachings of the present invention, 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 computation, holding the threshold value constant, initiated 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.
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.

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