Device for detecting displacement between patterns

Details Device for detecting displacement between patterns Device for detecting displacement between patterns

1977-01-26

1979-01-23

Boudreau, Leo H.

Communications: electrical

Digital comparator systems

3401463Q, G06K 912

Patent

active

041363329

ABSTRACT:
Disclosed is a device for detecting a displacement between patterns comprising a picking-up device, first and second memory means for storing a first and a second patterns picked up by said picking up device, means for shifting said first and second patterns relative to each other thereby obtaining a correlation value for each shift between them, means for obtaining a maximum correlation value and deriving a displacement in terms of the number of shifts which gives said maximum correlation value.

REFERENCES:
patent: 3223973 (1965-12-01), Chatten
patent: 3231860 (1966-01-01), Chatten
patent: 3506807 (1970-04-01), Malaby
patent: 3587047 (1971-06-01), Cutaia
patent: 3849762 (1974-11-01), Fujimoto et al.
patent: 3898617 (1975-08-01), Kashioka et al.
patent: 4014000 (1977-03-01), Uno et al.

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