Image analysis – Histogram processing – For setting a threshold
Patent
1980-05-30
1986-05-20
Krass, Errol A.
Image analysis
Histogram processing
For setting a threshold
364727, 382 16, G06K 952
Patent
active
045906084
ABSTRACT:
A method and apparatus for topographic feature extraction by masking a video signal representation of an optical image using a two-dimension Walsh function is disclosed. The optical energy of an image is converted into a video signal. A Walsh function signal in accordance with a two-dimension Walsh is generated. The video signal is multiplied with the Walsh function signal to produce a Walsh transform coefficients signal indicative of the decomposed spectral components of the image. The method and apparatus can further include providing selected topographical feature signals in accordance with the Walsh transform coefficients of selected topographic features. A selected topographical feature can be detected by comparing the Walsh transform coefficients signal with the selected topographical feature signals. The Walsh transform coefficients signal is unique to the selected topographical feature being detected.
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Rao et al.; "Image Data Processing by Hadamard-Haar Transform"; IEEE Trans. on Computers; vol. c-24, No. 9, Sep. 1975; pp. 888-896.
Chen Pi-Fuay
Rohde Frederick W.
Seemuller William W.
Hollis Darrell E.
Krass Errol A.
The United States of America as represented by the Secretary of
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