Device and method for parasitic heat compensation in an infrared camera
AssigneeLynred
InventorsAlain Durand, Nicolas Boudou
Life of this patent
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Abstract
A method of calibrating an infrared (IR) camera including a pixel array housed in a housing, the pixel array having an image sensor and one or more parasitic heat sensing pixels arranged to receive infrared light from different portions of an interior surface of the housing, the method including: receiving, by a processing device, one or more readings from each of the parasitic heat sensing pixels and from each pixel of the pixel array; and generating, by the processing device based on the one or more readings, one or more conversion matrices for converting readings from the parasitic heat sensing pixels into pixel correction values for performing 2D signal correction of the image.
Claims9
A method of calibrating an infrared camera comprising a pixel array housed in a housing, the pixel array having an image sensor and one or more parasitic heat sensing pixels arranged to receive infrared light from different portions of an interior surface of the housing, the method comprising:
- receiving, by a processing device, one or more readings from each of said parasitic heat sensing pixels and from each pixel of said pixel array;
- and
- generating, by the processing device based on said one or more readings, one or more conversion matrices for converting said readings from said parasitic heat sensing pixels into pixel correction values for performing 2D signal correction of signals captured by the image sensor, wherein generating the one or more conversion matrices comprises:
- determining by the processing device, for each image pixel of the image sensor and for each of said parasitic heat sensing pixels based on an assumption of the responsivity of each pixel, a relative transfer function based on an etendue of each pixel with respect to each of a plurality of zones of said interior surface.
A computing device configured to perform calibration of an IR camera, the computing device comprising:
- an IR camera interface configured to receive an image captured by an image sensor of the IR camera and one or more readings from parasitic heat sensing pixels of the IR camera;
- and
- a processing device configured to:
- generate, based on said one or more readings, one or more conversion matrices for converting said readings from said parasitic heat sensing pixels into pixel correction values for performing 2D signal correction of signals captured by the image sensor, wherein generating the one or more conversion matrices comprises:
- determine for each image pixel of the image sensor and for each of said parasitic heat sensing pixels based on an assumption of the responsivity of each pixel, a relative transfer function based on an etendue of each pixel with respect to each of a plurality of zones of said interior surface.
Dependencies are inferred from the claim text.