On-board non-uniformity correction method for long wave linear array infrared camera in real time

Abstract

The method of real-time correction of non-uniformity of long-wave linear array infrared camera on the star firstly sends out low-temperature and high-temperature calibration commands sequentially, controls the movement of the black body to align the infrared camera with the central area of ​​the black body, and stores the image data after the temperature is stable, and then calculates each The average value data of each pixel and the average value of all pixels, and then obtain the difference between the high and low temperature average data and the average value of the difference, use the difference and the average value to judge the blind pixel point, and finally use the row average value for the blind pixel point. Blind element replacement, and calculate the average value of low temperature, high temperature, high and low temperature difference image data after blind element replacement, and then obtain the correction coefficient, and correct the original image output by the detector. Compared with the prior art, the non-uniformity real-time correction method of the present invention reduces the correction deviation caused by the non-uniformity correction through ground calibration, improves the imaging quality of the infrared camera, and has good use value.

Description

technical field [0001] The invention relates to the technical field of infrared imaging, in particular to a real-time correction method for on-board non-uniformity of a long-wave line array infrared camera. Background technique [0002] Infrared detectors have non-uniformity problems due to the limitations of materials and process levels. The non-uniformity of the infrared detector refers to the inconsistency of the output of each unit of the detector when the unit of the detector receives uniform radiation input, which is also called the inherent spatial noise. This noise will seriously affect the imaging quality of the imaging system, and then affect the overall performance of the optoelectronic system, so non-uniformity correction must be performed. [0003] In addition, due to the huge difference in temperature between the space environment where the spaceborne infrared camera system is located and the ground, the response characteristics of the detector will experience...

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