图像畸变校正包括空间位置校正和灰度校正。
Image distortion correction includes spatial correction and gray-level correction.
该方法利用与光轴对称的径向畸变数学模型求出光学镜头的校正系数，对畸变图像进行校正。
The method USES the model of radial nonlinear distortion with the symmetry of optical axis to obtain correction coefficients of the optical lens, and then corrects the distortion image.
论文第二部分实现了图像辐射畸变的校正。
Radiometric correction of images is dealt with in the second part of this paper.
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