Non-refrigerant thermal imager shutter-free nonuniformity correcting device based on template method

Abstract

The invention relates to a non-refrigerant thermal imager shutter-free nonuniformity correcting device based on a template method. The correcting method is carried out according to the following steps that 1, the gain coefficient of a thermal imager in the work temperature range is calculated; 2, a nonuniformity characteristic template is used for extraction, and original images of uniform scenes by the thermal imager in the work temperature range of a detector are obtained; 3, the correlation coefficient is calculated, the corresponding template and the current real-time images are used for calculating the optimum coefficient and evaluating the correction effect according to the current work temperature of the detector; and 4, the nonuniformity correction is carried out, and the current real-time image frame adopts the novel basis background for carrying out the nonuniformity correction. The method has the advantages that a detector temperature control system is not needed, a shutter is not needed, the nonuniformity characteristic basis backgrounds at different focal plane temperatures are collected in a laboratory, the correlation coefficient is calculated through the combination of the characteristic basis backgrounds according to the real-time scene, the nonuniformity basis background of images is modified in real time, and the nonuniformity correction of the real-time images is realized.

Description

technical field [0001] The invention relates to a non-uniformity correction method for an uncooled thermal imager without a shutter based on a template method, which is suitable for non-uniformity correction of an uncooled thermal imager without a temperature control system and without a shutter. Background technique [0002] Due to the change of the working time and the working temperature of the uncooled detector, the non-uniformity of the pixel changes obviously, resulting in poor stability of the image quality. [0003] In traditional applications, the temperature control system is used to stabilize the focal plane temperature of the uncooled detector, combined with the method of background correction by the shutter at a set interval to solve this problem. However, in this technology that requires a shutter to perform background correction, new structural components-detector temperature control components, shutters and corresponding control motors, etc. need to be added....

AI Technical Summary

Problems solved by technology

1) Increase the cost of the uncooled thermal imager; 2) Increase the structural parts and increase the workload of later maintenance; 3) Increase the power consumption of the thermal imager system; 4) Frequent shuttering limits the application of the thermal imager

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