Optical information processing apparatus and method using comput

Details Optical information processing apparatus and method using comput Optical information processing apparatus and method using comput

1992-10-28

1995-01-31

Mai, Tan V.

Boots, shoes, and leggings

364827, G06E 300

Patent

active

053863780

ABSTRACT:
An input image of an object is optically Fourier-transformed and after coordinate-transforming the Fourier-transformed input image optically to obtain a rotation-invariant and scale-invariant image, the resultant image is pattern-matched with a computer generated hologram of a reference image. The coordinate-transformation of the Fourier-transformed input image is made using an optical phase filter represented as a computer generated hologram.

REFERENCES:
patent: 4084255 (1978-04-01), Casasent et al.
A. M. Berenzy et al., `A Pattern Recognition System Using Polar-Logarithmic Image Conversion`, *p. 50, line 11-p. 52, line 1; figure 1*, Telecommunications and Radio Engineering, vol. 44, No. 5, May 1989, Washington, U.S. pp. 50-52.
Yunglong Sheng, `Fourier-Mellin spatial filters for inariant pattern recognition`, * chapter 2; figure 1 * Optical Engineering, vol. 28, No. 5, May 1989, Bellingham U.S., pp. 494-500.
Patent Abstracts of Japan, vol. 12, No. 125 (p-691) 19 Apr. 1988 & JP-A-62 250 384 (Toshiba Corp.) 31.

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