Image comparison system

Details Image comparison system Image comparison system

1983-08-02

1985-04-23

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

250550, 250562, 35016212, 356237, 382 31, G01N 2132, G06K 900

Patent

active

045134413

ABSTRACT:
Image comparison is accomplished by forming a composite image composed of a reference image and a test image. A two-dimensional image spectrum is generated from the composite image and then is whitened by setting the magnitude of every point of the two-dimensional image spectrum to a uniform level. A phase-only image of the composite image is then constructed, and values of the phase-only image exceeding a predetermined threshold are detected as an indication of the location of a difference between the reference and test images.

REFERENCES:
patent: 4084255 (1978-04-01), Casasent et al.
patent: 4282510 (1981-08-01), Southgate
patent: 4282511 (1981-08-01), Southgate et al.
patent: 4330775 (1982-05-01), Iwamoto et al.
patent: 4360269 (1982-11-01), Iwamoto et al.

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