Near-infrared disguise detection
First Claim
Patent Images
1. A detection system for use in detecting a human in a scene, the detection system comprising:
- a first camera sensitive to a first band of wavelengths within a reflected infrared radiation range and operable to provide one or more frames of a first image output representative of the scene;
a second camera sensitive to a second band of wavelengths within the reflected infrared radiation range and operable to provide one or more frames of a second image output representative of the scene;
an optical device positioned to direct light reflected from the scene in at least the first band of wavelengths to the first camera and to direct light reflected from the scene in at least the second band of wavelengths to the second camera, wherein the one or more frames of the first image output are co-registered in time with the one or more frames of the second image output; and
a processing apparatus operable to detect a human in the scene based on the first and second image outputs.
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Abstract
Detection of a person disguised with one or more artificial materials includes detecting reflection from at least one portion of a head of a human body in at least a portion of an upper band of the near infrared spectrum. The presence of an artificial material associated with the head of the human body is determined based on the detected reflection.
75 Citations
28 Claims
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1. A detection system for use in detecting a human in a scene, the detection system comprising:
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a first camera sensitive to a first band of wavelengths within a reflected infrared radiation range and operable to provide one or more frames of a first image output representative of the scene;
a second camera sensitive to a second band of wavelengths within the reflected infrared radiation range and operable to provide one or more frames of a second image output representative of the scene;
an optical device positioned to direct light reflected from the scene in at least the first band of wavelengths to the first camera and to direct light reflected from the scene in at least the second band of wavelengths to the second camera, wherein the one or more frames of the first image output are co-registered in time with the one or more frames of the second image output; and
a processing apparatus operable to detect a human in the scene based on the first and second image outputs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A detection system comprising:
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first camera means for sensing radiation of a scene within a first band of wavelengths in a reflected infrared radiation range and operable to provide one or more frames of a first image output representative of the scene;
second camera means for sensing radiation of the scene within a second band of wavelengths in the reflected infrared radiation range and operable to provide one or more frames of a second image output representative of the scene;
optical device means positioned for directing light reflected from the scene in at least the first band of wavelengths to the first camera means and for directing light reflected from the scene in at least the second band of wavelengths to the second camera means such that one or more frames of the first image output are co-registered in time with one or more frames of the second image output; and
processing means for detecting a human in the scene based on the first and second image outputs. - View Dependent Claims (11, 12, 13, 14, 15, 16)
fusing means connected to said first and second camera means for fusing spectral powers P(i,j)1 of pixels (i,j)1 from said first camera means with spectral powers P(i,j)2 of corresponding pixels (i,j)2 from said second camera means, resulting in fused spectral powers P(i,j)f; and
thresholding means, connected to said fusing means, for thresholding fused spectral powers P(i,j)f from said fusing means, resulting in threshold spectral powers P(i,j)t; and
wherein;
the scene is focused by said first camera means on a first sensing array having m×
n pixels;
the scene is focused by said second camera means on a second sensing array having m×
n pixels;
each pixel is located at ith row and jth column;
0≦
i≦
m; and
0<
j≦
n.
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12. The system of claim 11, further comprising indicating means for displaying a segmented image of the scene.
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13. The system of claim 12, wherein:
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14. The system of claim 13, wherein:
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15. The system of claim 10, wherein a wavelength between the first and second bands of wavelengths is about 1.4 microns.
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16. The system of claim 10, wherein:
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the first band of wavelengths is between about 0.8 and 1.4 microns; and
the second band of wavelengths is between about 1.4 microns and 2.2 microns.
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17. A method for detecting humans, comprising:
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focusing a scene on a first m x n pixel array that is sensitive to light of a first bandwidth within a reflected infrared radiation range resulting in one or more frames of a first image output representative of the scene and on a second m×
n pixel array that is sensitive to light of a second bandwidth within the reflected infrared radiation range resulting in one or more frames of a second image output representative of the scene;
co-registering one or more frames of the first image output with one or more frames of the second image output, wherein co-registering the frames comprises using an optical device to direct light reflected from the scene in at least the first bandwidth to the first m×
n pixel array at each of a plurality of points in time and directing light reflected from the scene in at least the second bandwidth to the second m×
n pixel array at each of the plurality of points in time; and
using the first and second image outputs to detect a human in the scene. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
fusing a spectral power P(i,j)1 of each pixel of the first m×
n pixel array with a spectral power P(i,j)2 of each corresponding pixel of the second m×
n pixel array, to result in a spectral power P(i,j)f of a fused pixel, respectively;
thresholding the spectral power P(i,j)f of each fused pixel into a first value if the spectral power is greater than a threshold value; and
thresholding the spectral power P(i,j)f of each fused pixel into a second value if the spectral power is less than the threshold value;
wherein;
0<
i≦
m; and
0<
j≦
n.
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27. The method of claim 26, wherein:
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28. The method of claim 27, wherein:
Specification