Maskable bilevel correlators

Details Maskable bilevel correlators Maskable bilevel correlators

1988-08-08

1991-05-28

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

36472803, 364819, 382 33, G06K 964

Patent

active

050201131

ABSTRACT:
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.

REFERENCES:
patent: 3597083 (1971-08-01), Fraser
patent: 4244029 (1981-01-01), Hoyan et al.
patent: 4475238 (1984-10-01), Everhart
patent: 4622595 (1986-11-01), Histake et al.
patent: 4706296 (1987-11-01), Pedotti et al.
patent: 4750144 (1988-06-01), Wilcox
patent: 4864629 (1989-09-01), Deering
patent: 4866534 (1989-09-01), Tada

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