Auto-correlation circuit for use in pattern recognition

Details Auto-correlation circuit for use in pattern recognition Auto-correlation circuit for use in pattern recognition

1982-12-28

1991-04-09

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

36472805, 36472807, 381 42, 382 1, 382 34, G06K 936

Patent

active

050071017

ABSTRACT:
An auto-correlation unit for pattern recognition to obtain auto-correlation functions as for sampled signals is disclosed N pieces of sample values X.sub.n (n=0 to N-1)are extracted from a series of the sample values expressed with an accuracy of optional multi-bits and the auto-correlation coefficients of these N pieces of the sample values obtained. The sum of sample values X.sub.n and X.sub.n-.tau. (.tau.=0 to P) are calculated. The squared value (X.sub.n +X.sub.n-.tau.).sup.2 of the added results is previously memorized in a ROM while being addressed by the resultant sum. The auto-correlation coefficients are available by feeding the output (X.sub.n +X.sub.n-.tau.).sup.2 of the ROM and executing calculation as defined by the following equation: ##EQU1##

REFERENCES:
patent: 4282406 (1981-08-01), Yato et al.
patent: 4301329 (1981-11-01), Taguchi

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