Image analysis system employing filter look-up tables

Image analysis – Histogram processing – For setting a threshold

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382 8, 36472405, 36472419, 358166, 358106, G06K 952

Patent

active

049411918

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.

REFERENCES:
patent: 3889108 (1975-06-01), Cantrell
patent: 4489390 (1984-12-01), Parenti et al.
patent: 4534059 (1985-08-01), Yamada
patent: 4688095 (1987-08-01), Beg et al.
patent: 4694342 (1987-09-01), Klees

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