Fast pattern recognizer utilizing dispersive delay line
AssigneeFPR Corporation
InventorWalter E. Chase
Life of this patent
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Abstract
A fast pattern recognition system includes a combination of digital and analog processing circuitry which allows the system to achieve super computing processing speeds within an open personal computer architecture. The system receives a bit map which is representative of the unknown pattern, such as a picture of an unknown person. The bit map could have multiple people in it--no other system has "faces in the crowd" ability. The bit map associated with the unknown pattern is then pre-processed and compared against a plurality of known patterns in a database using a dispersive delay line, to determine how well the unknown pattern correlates with the known patterns.
Claims43
A pattern recognition system which compares an unknown pattern with a known pattern, the system comprising:
- A. a first processing means for transforming said unknown pattern to the frequency domain, thereby providing a processed unknown pattern;
- B. a second processing means for transforming said known pattern to the frequency domain, thereby providing a processed known pattern;
- C. a multiplying means for multiplying a chirp signal f.sub.ch, the processed pattern produced by one of said processing means, and the complex conjugate of the processed pattern produced by the other of said processing means, thereby providing a product signal;
- D. a dispersive delay line;
- and
- E. a means for applying said product signal to said dispersive delay line, thereby providing a correlation signal indicative of the level of correlation between said unknown pattern and said known pattern.
In a pattern recognition system which compares an unknown pattern with a known pattern, a method comprising the steps of:
- A. transforming said unknown pattern to the frequency domain to provide a transformed unknown pattern;
- B. transforming said known pattern to the frequency domain to provide a transformed known pattern;
- C. conjugating said transformed known pattern to provide a conjugated transformed known pattern;
- D. multiplying a chirp signal f.sub.ch by said conjugated transformed known pattern to provide a chirped conjugated transformed known pattern which is a template;
- E. complex multiplying said template by said transformed unknown pattern to provide a product signal;
- and
- F. applying said product signal to a dispersive delay line which provides a correlation signal whose value is indicative of the level of correlation between said known pattern and said unknown pattern.
Dependencies are inferred from the claim text.