Radiometric correction and alignment techniques for thermal imager with non-contact temperature sensor
First Claim
1. A method comprising:
- capturing a thermal image of a scene by an array of infrared sensors of an imaging system, wherein the thermal image comprises a plurality of pixel values;
detecting, by a non-contact temperature sensor, a temperature value associated with a portion of the scene;
determining an alignment of the temperature sensor relative to the array;
identifying a correspondence between the portion of the scene and a subset of the pixel values based on the alignment of the temperature sensor relative to the array;
comparing the subset of pixel values with the detected temperature value;
generating a correction term based on the comparing; and
applying the correction term to at least the subset of pixel values to radiometrically calibrate the subset of pixel values.
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Abstract
Various techniques are provided for calibrating a thermal imaging device using a non-contact temperature sensor. In one example, a method includes capturing a thermal image of a scene. The thermal image comprises a plurality of pixel values. The method also includes detecting, by a non-contact temperature sensor, a temperature value associated with a portion of the scene corresponding to a subset of the pixel values. The method also includes comparing the subset of pixel values with the detected temperature value. The method also includes generating a correction term based on the comparing. The method also includes applying the correction term to at least the subset of pixel values to radiometrically calibrate the subset of pixel values. Related systems and alignment processes are also provided.
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Citations
20 Claims
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1. A method comprising:
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capturing a thermal image of a scene by an array of infrared sensors of an imaging system, wherein the thermal image comprises a plurality of pixel values; detecting, by a non-contact temperature sensor, a temperature value associated with a portion of the scene; determining an alignment of the temperature sensor relative to the array; identifying a correspondence between the portion of the scene and a subset of the pixel values based on the alignment of the temperature sensor relative to the array; comparing the subset of pixel values with the detected temperature value; generating a correction term based on the comparing; and applying the correction term to at least the subset of pixel values to radiometrically calibrate the subset of pixel values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system comprising:
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an array of infrared sensors configured to capture a thermal image of a scene, wherein the thermal image comprises a plurality of pixel values; a non-contact temperature sensor configured to detect a temperature value associated with a portion of the scene; a memory component storing machine-executable instructions; and a processor configured to execute the instructions to cause the system to; determine an alignment of the temperature sensor relative to the array, identify a correspondence between the portion of the scene and a subset of the pixel values based on the alignment of the temperature sensor relative to the array, compare the subset of pixel values with the detected temperature value, generate a correction term based on the comparing, and apply the correction term to at least the subset of pixel values to radiometrically calibrate the subset of pixel values. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification