Optics: measuring and testing – Document pattern analysis or verification
Patent
1989-10-30
1991-10-29
McGraw, Vincent P.
Optics: measuring and testing
Document pattern analysis or verification
250556, 382 42, G06K 974, G06K 964
Patent
active
050610635
ABSTRACT:
Lines of text (e.g., printing on a product) are verified by forming a one-dimensional image of each line substantially parallel to its length. This one-dimensional image information is compared to corresponding information for the intended lines of text. This comparison is preferably done using acousto-optic correlator systems. Space and frequency multiplexing may be used to allow parallel processing of several lines of text and/or to allow comparisons with multiple references to be made simultaneously. The invention may be used to determine the acceptability of products based on the correctness of the text image, and to reject products on which the correct text does not appear.
REFERENCES:
patent: 3398269 (1968-08-01), Williams
patent: 4622875 (1986-11-01), Emery et al.
patent: 4736099 (1988-04-01), Zelenka
patent: 4833637 (1989-05-01), Casasent et al.
patent: 4906099 (1990-04-01), Casasent
A. Mahalanobis et al., "Minimum Average Correlation Energy Filters," Applied Optics, Sep. 1, 1987, vol. 26, No. 17, pp. 3633-40.
R. A. Sprageu, "A Review of Acousto-Optic Signal Correlators," Optical Engineering, Sep./Oct. 1977, vol. 16, No. 5, pp. 467-74.
D. Casasent et al., "General I and Q Data Processing on a Multichannel AO System," Applied Optics, Sep. 15, 1986, vol. 25, No. 18, pp. 3217-24.
Jackson Robert R.
Keesee LaCharles P.
McGraw Vincent P.
Philip Morris Incorporated
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