System for detection and recognition of an object by video imaging means
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United States of America Patent
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-
Aug 23, 1994
Grant Date -
N/A
app pub date -
Mar 17, 1992
filing date -
Mar 17, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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