Non-uniformity correction method and apparatus for infrared image

Abstract

The invention discloses a non-uniformity correction method and apparatus for an infrared image. The non-uniformity correction method for the infrared image comprises the steps of obtaining a to-be-corrected image; removing overheated pixels with fixed positions in the obtained to-be-corrected image, and performing blind pixel compensation by adopting a neighborhood pixel value replacement method to obtain a first image; obtaining pure sky images of two different elevation angles as two temperature point images, obtaining a gain coefficient and a bias coefficient, and performing two-point method correction of a gradient sky background on the first image to obtain a second image; and removing residual noise points for the second image through a gain coefficient correction method and a bias coefficient correction method to obtain a third image. The invention furthermore discloses the non-uniformity correction apparatus for the infrared image.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a non-uniformity correction method and device for infrared images. Background technique [0002] Infrared focal plane array (IRFPA-Infrared Focal Plane Arrays) is a new detection device developed in recent decades, which has the advantages of high sensitivity, high signal-to-noise ratio, and simple and compact structure. It is made of semiconductor materials sensitive to infrared radiation, and semiconductor materials are prone to material unevenness, mask errors, process defects, etc. during the doping process, and each pixel will inevitably produce response non-uniformity , in the form of additive or multiplicative noise, fixed patterns or random noise with uneven brightness and darkness usually appear on the image, which seriously affects the performance of the detection system. Moreover, as the service life increases, the number of blind elements will gradually incr...

AI Technical Summary

Problems solved by technology

However, in the process of actually capturing the target, it is found that the blackbody radiation calibration data is not effective in correcting the non-uniformity of the actual sky background, and considering that the calibration process of the blackbody used in the airborne infrared detection system is cumbersome and expensive

Therefore, it is difficult to use the laboratory blackbody correction data to perform non-uniform correction on the infrared weak point target image in real time.

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