Chopper based infrared imagery heterogeneity correction method

Abstract

The invention discloses a chopper based infrared imagery heterogeneity correction method. According to the chopper based infrared imagery heterogeneity correction method, innovation is made on the basis of distortion lens real-time correction, and a chopper with different shielding effects is designed and applied to replace correction technology of an original distortion lens; meanwhile, a solution method of chopping correction technology is provided to solve the problem of the synchrony relationship between an infrared imagery integrated signal and chopping stepping and rotation periods; since an infrared detector is small in size and a photoelectric angle measurement alignment code disc cannot be installed, automatic identification of high-temperature images, background images, low-temperature images, and half-shielding needs achieving, so that chopping based imagery heterogeneity correction is achieved.

Description

technical field [0001] The invention belongs to the technical field of infrared focal plane detectors, and in particular relates to a chopper-based infrared image non-uniformity correction method. Background technique [0002] Infrared Focal Plane Array IRFPA (Infrared Focal Plane Array) has fixed pattern noise FPN (Fixed Pattern Noise) in the detector array due to the non-uniformity and instability of the detector itself or the response between detector elements. One of the main factors limiting the improvement of imaging quality. Therefore, the non-uniformity correction NUC (Non_Uniformity Correction) problem of IRFPA has become a hot research technology at home and abroad. [0003] Usually, thermal imaging cameras are mostly calibrated by a radiation reference source, and the correction coefficient is read out when the detector is working normally, and non-uniformity correction is performed on the input image in real time. However, since the FPN changes slowly with time...

AI Technical Summary

Problems solved by technology

This method innovates on the basis of real-time correction based on deformable lens, and designs and uses choppers with different occlusion effects to replace the correction technology of the original deformable mirror; at the same time, it proposes a solution of chopping correction technology to solve the problem of infrared image integral signal and The problem of synchronous relationship between chopping stepping and rotation cycle; because the infrared detector is very small, it is impossible to install the photoelectric angle measurement and positioning code disc, so it is necessary to solve the automatic discrimination of high temperature images, automatic discrimination of background images, and automatic discrimination of low temperature images. Discrimination, semi-occlusion automatic discrimination, etc., so as to realize image non-uniformity correction based on chopping

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