Automatic mask threshold

Image analysis – Histogram processing – For setting a threshold

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382 30, 382 33, 382 34, G06K 962, G06K 964, G06K 968

Patent

active

052610101

ABSTRACT:
An improved method for finding the mask threshold for a maskable bilevel correlator operates on a series of frames of information. Beginning with an initial threshold, two rates are computed. The rate of change of the correlation peak magnitude P.sub.(T), a function of threshold T, with respect to the change in the value of the mask threshold T, or (dP.sub.(T) /dT), and the corresponding rate of change of correlation reference pixels with magnitude exceeding the mask threshold, U.sub.(T), a function of threshold T, with respect to the change in the value of the mask threshold T, or (dU.sub.(T) /dT), are measured. The correct, or best, value of the threshold occurs when .vertline.dP.sub.(T) /dT.vertline..gtoreq.0.5*.vertline.dU.sub.(T) /dT.vertline..

REFERENCES:
patent: 5020113 (1991-05-01), Lo et al.
patent: 5036546 (1991-07-01), Gottesman et al.
patent: 5119435 (1992-06-01), Berkin
patent: 5127063 (1992-06-01), Nishiya et al.

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