Logarithmic polar coordinate transforming method, vision recogni

Details Logarithmic polar coordinate transforming method, vision recogni Logarithmic polar coordinate transforming method, vision recogni

1992-10-19

1994-08-30

Nguyen, Long T.

Boots, shoes, and leggings

382 43, G06F 738, G06K 936

Patent

active

053434153

ABSTRACT:
A vision recognizing method includes a logarithmic polar coordinate transforming method including the steps of storing an input image f1(x, y); optically generating complex amplitude information f1(x, y)A(x, y)T(x, y) by multiplying the information of the input image by the product of phase information A(x, y) for performing a logarithmic polar coordinate transformation and amplitude information T(x, y), an amplitude of which changes according to distance between each point composing the amplitude information and origin of logarithmic polar coordinate; and Fourier-transforming the complex amplitude information f1(x, y)A(x, y)T(x, y). An optical information processing apparatus is used to carry out the method and includes a combination of lenses and liquid crystal displays.

REFERENCES:
patent: 4084255 (1978-04-01), Casasent et al.
patent: 5050220 (1991-09-01), Marsh et al.
patent: 5239595 (1993-08-01), Takemura et al.
Patent Abstracts of Japan, vol. 8, No. 171 (P-293) Oct. 8, 1982 & JP-A-59 065 823 (Ricoh KK) Apr. 14, 1984 "abstract".
Patent Abstracts of Japan, vol. 5, No. 77 (P-62) Aug. 2, 1979 & JP-A-56 024 310 (Ricoh Co. Ltd.) Mar. 7, 1981 "abstract".
"Real-time deformation invariant optical pattern recognition using coordinate transformations", Casasent et al., Applied Optics, vol. 26, No. 5, Mar. 1, 1987, pp. 938-942.

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