Maskable bilevel correlator

Details Maskable bilevel correlator Maskable bilevel correlator

G - Physics

06

F

354/141

G06F 17/15 (2006.01) G06T 7/20 (2006.01) H04N 7/26 (2006.01)

Patent

CA 1316264

MASKABLE BILEVEL CORRELATOR ABSTRACT OF THE DISCLOSURE A method and apparatus for correlating two signals representing a live image and a reference image are disclosed. The reference signal is processed to provide a polarity bit and mask bit for each pixel position in the reference image. The processed video signal is stored in a memory 20 and used in a convolver and summer section 18 in which the polarity bits between the reference and live images are gated by gate 17 and are used in generating a correlation output from summer 23. However, the polarity bits do not affect the correlation output if the logical output from gate 19 is of a given state which occurs if the associated mask bits indicate that the gradient value at the particular pixel position does not exceed certain minimum threshold values.

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