US PATENT SUBCLASS 382 / 210
.~.~ Spatial filtering (e.g., holography)

Current as of: June, 1999
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382 /   HD   IMAGE ANALYSIS

181  DF  PATTERN RECOGNITION {8}
209  DF  .~ Template matching (e.g., specific devices that determine the best match) {5}
210.~.~ Spatial filtering (e.g., holography) {1}
211  DF  .~.~.~> With electrically controlled light modulator or filter

DEFINITION

Classification: 382/210

Spatial filtering (e.g., holography):

(under subclass 209) Subject matter in which an optical image of each pattern* to be recognized is transformed into a light amplitude distribution that is proportional to the two-dimensional Fourier transform of the pattern* image, and a spatial filter located in the transform plane modifies selected Fourier components of the resulting Fourier spectrum.

SEE OR SEARCH THIS CLASS, SUBCLASS:

280, for nonholos:graphic Fourier transformations.

SEE OR SEARCH CLASS

235, Registers,

457, for holos:graphic encoded records.

250, Radiant Energy, 550, for interference pattern* analysis limited to prephotocell systems.