The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 23, 1994
Filed:
Mar. 17, 1992
Kenneth A Corbett, Huntsville, AL (US);
David R Anderson, Arab, AL (US);
Corbett Technology Company, Inc., Huntsville, AL (US);
Abstract
Apparatus for detecting and identifying, by video imagery, an object such as a helicopter, having a characteristic temporal signature containing phase and magnitude information. The object is acquired and the video signals are stored and then temporally filtered by a FFT on a pixel to pixel basis. The magnitude and phase of pixel at a predetermined frequency is determined and compared with periodic frequencies generated by known objects, such as helicopter rotors, to determine if the frequency generated by the object matches any of the known frequencies. Further processing determines the number of blades and directions of rotation of the blades which removes ambiguities from frequency only processing.