Radar imaging system and method using second moment spatial variance
First Claim
1. A detection system comprising:
- means for receiving a frame of image data;
means for performing a variance calculation with respect to at least one pixel in said frame of image data; and
means for comparing said calculated variance with a predetermined threshold to provide output data.
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Abstract
A detection system and method. The inventive system includes an arrangement for receiving a frame of image data; an arrangement for performing a variance calculation with respect to at least one pixel in the frame of image data; and an arrangement for comparing the calculated variance with a predetermined threshold to provide output data. In the illustrative embodiment, the frame of image data includes a range/Doppler matrix of N down range samples and M cross range samples. In this embodiment, the arrangement for performing a variance calculation includes an arrangement for calculating a variance over an N×M window within the range/Doppler matrix. The arrangement for performing a variance calculation includes an arrangement for identifying a change in a standard deviation of a small, localized sampling of cells. In accordance with the invention, the arrangement for performing a variance calculation outputs a variance pixel map.
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Citations
14 Claims
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1. A detection system comprising:
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means for receiving a frame of image data; means for performing a variance calculation with respect to at least one pixel in said frame of image data; and means for comparing said calculated variance with a predetermined threshold to provide output data. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A radar system comprising:
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a radar antenna; a transmitter; a receiver; circulator means for coupling said transmitter and receiver to said antenna; an image processor coupled to said receiver; and a detection processor coupled to said image processor, said detection processor having; software for receiving a frame of image data; software for performing a variance calculation with respect to at least one pixel in said frame of image data; and software for comparing said calculated variance with a predetermined threshold to provide output data. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A detection method comprising the steps of
receiving a frame of image data; -
performing a variance calculation with respect to at least one pixel in said frame of image data; and comparing said calculated variance with a predetermined threshold to provide output data.
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Specification