Detection of a concealed object
First Claim
Patent Images
1. A method, comprising:
- detecting electromagnetic radiation returned from a concealed surface associated with a person;
generating image data from the detected electromagnetic radiation;
segmenting the image data into image portions;
performing a Fourier transform on each of the image portions;
identifying the presence of a man-made object in one or more of the image portions based on spatial frequencies in the Fourier-transformed image portions, wherein the identifying the presence of the man-made object comprises applying at least one extraction filter to the image portion, thereby extracting features from the image portions, wherein the at least one extraction filter is a rotationally invariant extraction filter or a scale invariant extraction filter; and
communicating the presence of the man-made object.
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Abstract
Disclosed are systems, methods, devices, and apparatus to determine if a clothed individual is carrying a suspicious, concealed object. This determination includes establishing data corresponding to an image of the individual through interrogation with electromagnetic radiation in the 200 MHz to 1 THz range. In one form, image data corresponding to intensity of reflected radiation and differential depth of the reflecting surface is received and processed to detect the suspicious, concealed object.
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Citations
19 Claims
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1. A method, comprising:
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detecting electromagnetic radiation returned from a concealed surface associated with a person; generating image data from the detected electromagnetic radiation; segmenting the image data into image portions; performing a Fourier transform on each of the image portions; identifying the presence of a man-made object in one or more of the image portions based on spatial frequencies in the Fourier-transformed image portions, wherein the identifying the presence of the man-made object comprises applying at least one extraction filter to the image portion, thereby extracting features from the image portions, wherein the at least one extraction filter is a rotationally invariant extraction filter or a scale invariant extraction filter; and communicating the presence of the man-made object. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system, comprising:
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an array operable to interrogate a person with electromagnetic radiation at one or more frequencies in a frequency range; and a processing subsystem coupled to the array, the processing subsystem being operable to transform image data including intensity and depth data produced from returned electromagnetic radiation into one or more spatial frequency representations, to apply at least one extraction filter to the spatial frequency representations, and to adaptively process extracted features output from the one or more extraction filters so as to determine whether one or more objects being concealed by the person are man-made objects, wherein the at least one extraction filter is a rotationally invariant extraction filter or a scale invariant extraction filter. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method, comprising:
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detecting electromagnetic radiation returned from a concealed surface associated with a person; generating image data from the detected electromagnetic radiation; segmenting the image data into image portions; transforming the image portions in spatial frequency representations; extracting features from the spatial frequency representations based on spatial frequencies of the features, wherein the extracting the features comprise applying at least one extraction filter, that is a rotationally invariant extraction filter or a scale invariant extraction filter to the spatial frequency representations; and identifying the presence of a man-made object in one or more of the image portions based on the extracted features. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification