Flat field correction for infrared cameras
First Claim
1. A system, comprising:
- a focal plane array (FPA) of an infrared camera adapted to capture thermal image data in response to infrared radiation received by the FPA;
a memory adapted to store a set of supplemental flat field correction values that are based on a calibration of the FPA; and
a processor adapted to;
estimate a temperature difference between the FPA and a component of the infrared camera, separate from the FPA, that is in proximity to a first optical path of the infrared camera;
determine a scale factor from the estimated temperature difference;
apply the scale factor to the set of supplemental flat field correction values; and
apply the scaled set of supplemental flat field correction values to the thermal image data to adjust for non-uniformities associated with at least a portion of the first optical path.
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Accused Products
Abstract
Various techniques are provided to perform flat field correction for infrared cameras. In one example, a method of calibrating an infrared camera includes calibrating a focal plane array (FPA) of the infrared camera to an external scene to determine a set of flat field correction values associated with a first optical path from the external scene to the FPA. The method also includes estimating a temperature difference between the FPA and a component of the infrared camera that is in proximity to the first optical path. The method also includes determining supplemental flat field correction values based on, at least in part, the first set of flat field correction values, where the supplemental flat field correction values are adjusted based on the estimated temperature difference before being applied to thermal image data obtained with the infrared camera. The method also includes storing the supplemental flat field correction values.
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Citations
24 Claims
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1. A system, comprising:
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a focal plane array (FPA) of an infrared camera adapted to capture thermal image data in response to infrared radiation received by the FPA; a memory adapted to store a set of supplemental flat field correction values that are based on a calibration of the FPA; and a processor adapted to; estimate a temperature difference between the FPA and a component of the infrared camera, separate from the FPA, that is in proximity to a first optical path of the infrared camera; determine a scale factor from the estimated temperature difference; apply the scale factor to the set of supplemental flat field correction values; and apply the scaled set of supplemental flat field correction values to the thermal image data to adjust for non-uniformities associated with at least a portion of the first optical path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 23)
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8. A method of processing thermal image data captured by an infrared camera, the method comprising:
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capturing thermal image data at a focal plane array (FPA) of the infrared camera; estimating a temperature difference between the FPA and a component of the infrared camera, separate from the FPA, that is in proximity to an optical path of the infrared camera; determining a scale factor from the estimated temperature difference; applying the scale factor to a set of supplemental flat field correction values adapted to adjust for non-uniformities associated with at least a portion of the optical path, wherein the set of supplemental flat field correction values are based on a calibration of the FPA; and applying the scaled set of supplemental flat field correction values to the thermal image data. - View Dependent Claims (9, 10, 11, 12, 13, 14, 24)
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15. A method of calibrating an infrared camera, the method comprising:
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calibrating a focal plane array (FPA) of the infrared camera to an external scene to determine a first set of flat field correction values associated with a first optical path from the external scene to the FPA; estimating a temperature difference between the FPA and a component of the infrared camera, separate from the FPA, that is in proximity to the first optical path; determining a set of supplemental flat field correction values based on, at least in part, the first set of flat field correction values, wherein the supplemental flat field correction values are adapted to be applied to thermal image data captured by the FPA to adjust for non-uniformities associated with at least a portion of the first optical path; and storing the set of supplemental flat field correction values and the corresponding estimated temperature difference. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification