Method for correcting non-uniformity of image of Bayer filter array color camera

Abstract

The invention relates to a method for correcting non-uniformity of images of a Bayer filter array color camera, which comprises the steps of: (1) obtaining a plurality of Bayer-format images shot by the Bayer filter array color camera in uniform light; (2) decomposing the Bayer-format images shot in the uniform light into three images, respectively corresponding to colors of a red (R) channel, a green (G) channel and a blue (B) channel, grouping the images according to the image grayscale average, and calculating a coefficient of camera image non-uniformity correction; and (3) using the obtained correction coefficient to correct the non-uniformity of the images shot by the Bayer filter array color camera. By adopting the method, the problem that the method for correcting the non-uniformity of images of the traditional single-channel black and white camera cannot be directly applied in correction of the images of the Bayer filter array color camera can be solved at first, errors in image non-uniformity correction caused by non-linear response of the camera to light can be reduced, and thus the accuracy of image non-uniformity correction can be improved.

Description

technical field [0001] The invention relates to a camera image non-uniformity correction, in particular to a Bayer filter array color camera image non-uniformity correction method. Background technique [0002] With the improvement of the performance and reliability of photoelectric sensor devices, imaging systems based on CCD and CMOS photodetectors have been widely used in industrial inspection, military defense, space observation and other fields. Under the illumination of a uniform light source, the gray value of each pixel of the output image of a camera based on a photodetector should be exactly the same in theory, but in fact the output of each pixel will be different, resulting in an abnormal gray value of the pixel in the camera image. The main reasons for uniformity are as follows: [0003] (1) cos in the camera lens optical system 4 Factor, that is, the illuminance of the image point outside the optical axis decreases with the fourth power of the cosine of the f...

AI Technical Summary

Problems solved by technology

This method first solves the problem that the traditional single-channel black and white camera image non-uniformity correction method cannot be directly applied to the Bayer filter array color camera image, and at the same time reduces the image non-uniformity correction error caused by the nonlinear response of the camera to light, thereby improving Improve the accuracy of image non-uniformity correction

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