Divided-aperture infra-red spectral imaging system
First Claim
1. An infrared (IR) imaging system, the imaging system comprising:
- a plurality of cameras;
at least one thermal reference source having a known temperature;
a plurality of mirrors configured to reflect radiation from the at least one thermal reference source towards the plurality of cameras; and
a data-processing unit comprising a processor, the imaging system configured to;
acquire with the plurality of cameras one or more image frames of an object, a plurality of the one or more image frames having regions with the known temperature that corresponds to the at least one reference source; and
apply a dynamic calibration correction to the plurality of cameras based on the plurality of the one or more image frames having regions with the known temperature to allow every camera in the plurality of cameras to be calibrated to agree with every other camera in the plurality of cameras.
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Accused Products
Abstract
Various embodiments disclosed herein describe a divided-aperture infrared spectral imaging (DAISI) system that is adapted to acquire multiple IR images of a scene with a single-shot (also referred to as a snapshot). The plurality of acquired images having different wavelength compositions that are obtained generally simultaneously. The system includes at least two optical channels that are spatially and spectrally different from one another. Each of the at least two optical channels are configured to transfer IR radiation incident on the optical system towards an optical FPA unit comprising at least two detector arrays disposed in the focal plane of two corresponding focusing lenses. The system further comprises at least one temperature reference source or surface that is used to dynamically calibrate the two detector arrays and compensate for a temperature difference between the two detector arrays.
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Citations
66 Claims
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1. An infrared (IR) imaging system, the imaging system comprising:
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a plurality of cameras; at least one thermal reference source having a known temperature; a plurality of mirrors configured to reflect radiation from the at least one thermal reference source towards the plurality of cameras; and a data-processing unit comprising a processor, the imaging system configured to; acquire with the plurality of cameras one or more image frames of an object, a plurality of the one or more image frames having regions with the known temperature that corresponds to the at least one reference source; and apply a dynamic calibration correction to the plurality of cameras based on the plurality of the one or more image frames having regions with the known temperature to allow every camera in the plurality of cameras to be calibrated to agree with every other camera in the plurality of cameras. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An infrared (IR) imaging system, the imaging system comprising:
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a plurality of cameras; a first temperature-controlled reference source imaged by the plurality of cameras; a second temperature-controlled reference source; a first and a second temperature-controlled shutter removably positioned to block IR radiation incident on the system from reaching the plurality of cameras; and a data-processing unit comprising a processor, said data-processing unit configured to; acquire with the plurality of cameras one or more image frames of an object, a plurality of the one or more image frames having regions that correspond to radiation from the first and the second temperature-controlled reference sources; and dynamically calibrate the plurality of cameras so that various cameras imaging a scene agree on a temperature estimate of the first and second reference sources. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. An infrared (IR) imaging system, the imaging system comprising:
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a plurality of cameras; a reference having an unknown temperature; a plurality of mirrors configured to reflect radiation from the reference towards the plurality of cameras; and a data-processing unit comprising a processor, the imaging system configured to; acquire with the plurality of cameras one or more image frames of an object, a plurality of the one or more image frames having regions with the unknown temperature that corresponds to the reference; calculate a dynamic calibration correction using a temperature measured by one of the cameras in the plurality of cameras based on the plurality of the one or more image frames having regions with the unknown temperature as a reference temperature; and apply the calibration correction to the other cameras in the plurality of cameras to match the temperature estimate of the other cameras in the plurality of cameras with the reference temperature. - View Dependent Claims (51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66)
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Specification