Millimeter Wave Imaging Method and System to Detect Concealed Objects
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Abstract
The invention provides for an expandable multi channel radiometer imaging method and system. The imaging system includes a scanner for reflecting millimeter wave energy emanating from a pre-determined scene. The millimeter wave energy is focused to a focal plane array using an optical lens and a multi channel radiometer receives the millimeter wave energy. The focal plane array is formed by a plurality of pixels that each includes a single low noise amplifier. The number of pixels of the focal plane array is expendable to increase the resolution of a millimeter wave image. A virtual grid of cells is formed representing different values of millimeter wave energy within the imaging zone. Algorithms calculate differences of millimeter wave energy between cells of said virtual grid to display a composite image to identify concealed objects on an individual.
12 Citations
38 Claims
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1-20. -20. (canceled)
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21. A method of detecting concealed objects on an individual, the method comprising:
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scanning an imaging zone using an oscillating reflective surface; correlating movement of the oscillating reflective surface to coordinates in the imaging zone; receiving the millimeter wave energy; calculating values for a grid of cells representing the millimeter wave energy; analyzing differences between the values of the millimeter wave energy between the cells of the grid; and identifying contrast cells from the grid of cells, the contrast cells having values of the millimeter wave energy with a predetermined difference between adjacent cells. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. An imaging apparatus, comprising:
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a video imaging system configured to obtain a video image of an imaging zone; a scanner having a reflective surface configured to oscillate to reflect millimeter wave energy of a portion of the imaging zone to an optical lens; a multi channel radiometer coupled with the scanner that receives the millimeter wave energy from the optical lens; a processor coupled with the video imaging system and the multi channel radiometer, configured to; correlate movement of the reflective surface to coordinates in the imaging zone; calculate values for a grid of cells representing millimeter wave energy received by the multi channel radiometer; identify contrast cells from the grid of cells, the contrast cells identified as adjacent cells having values of the millimeter wave energy with a predetermined difference; form a discrete image of contrast cells; synchronize the discrete image of contrast cells with the video image of the imaging zone; and generate a composite image of the video image overlaid with the discrete image of contrast cells; and a display coupled with the processor that displays the composite image. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification