Method and apparatus for the identification of metal surface finishes
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United States of America Patent
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Apr 23, 1991
Grant Date -
N/A
app pub date -
Jul 17, 1989
filing date -
Jul 20, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The apparatus includes a specialized scanning system for sampling the metal includes an annular light source for omindirectionally illuminating the surface, a light regulator, and a matrix camera for forming a grey level image of the surface. The image is histogramed according to grey level. The first four statistical moments are calculated from the histogram. The moments are then used as a feature vector to identify the metal surface. If no match is found within the catalogued metal surfaces, allowing for predetermined tolerances for each moment, then the feature vector is catalogued for future recognition.
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