Image analysis system employing filter look-up tables
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United States of America Patent
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Jul 10, 1990
Grant Date -
N/A
app pub date -
Jan 4, 1988
filing date -
Jan 4, 1988
priority date (Note) -
Expired
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Abstract
An image processing system and filters applicable to such a system wherein digitized discrete signals, as pixel signals, are processed in a look-up table according to the sum of the current digitized value of a discrete signal multiplied by a factor and the digitized value of the signal from the look-up table for a preceding discrete signal multiplied by one less the factor for low pass filtering; and wherein high pass filtering is the difference between a factor times the current digitized value of a discrete signal and the digitized value of the low pass filter from the look-up table for a preceding discrete signal multiplied by a factor. Two dimensional filtering in a two dimensional array of pixels is afforded by identifying pixel signals by row and column and high pass filtering in pixel columns from row-to-row. Vector combinations of row and column filtered values are employed in a system for electro-optical inspection of the image of a product.
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