Position, rotation, and intensity invariant recognizing method

Patent · Sun Jan 01 04:00:00 EST 1989

OSTI ID:866994

Ochoa, Ellen ^[1]; Schils, George F ^[2]; Sweeney, Donald W ^[3]

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1. Pleasanton, CA
2. San Ramon, CA
3. Alamo, CA

A method for recognizing the presence of a particular target in a field of view which is target position, rotation, and intensity invariant includes the preparing of a target-specific invariant filter from a combination of all eigen-modes of a pattern of the particular target. Coherent radiation from the field of view is then imaged into an optical correlator in which the invariant filter is located. The invariant filter is rotated in the frequency plane of the optical correlator in order to produce a constant-amplitude rotational response in a correlation output plane when the particular target is present in the field of view. Any constant response is thus detected in the output The U.S. Government has rights in this invention pursuant to Contract No. DE-AC04-76DP00789 between the U.S. Department of Energy and AT&T Technologies, Inc.

• Research Organization: AT & T CORP
• DOE Contract Number: AC04-76DP00789
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4838644
• OSTI ID: 866994
• Country of Publication: United States
• Language: English

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