US PATENT SUBCLASS 382 / 213
.~.~.~ Using both positive and negative masks or transparencies

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}
212  DF  .~.~ Nonholographic optical mask or transparency {2}
213.~.~.~ Using both positive and negative masks or transparencies

DEFINITION

Classification: 382/213

Using both positive and negative masks or transparencies:

(under subclass 212) Subject matter wherein pattern* matching is performed using optically stored prototypes which represent both positive and negative versions of the pattern*s to be recognized.