The characterization and correction of lens distortion is an important part of optical measurement. This work analyzes the formation mechanism of color fringes and multiplication moiré, and discusses modification of the color CCD moiré method for correcting lens distortion. A demosaicing algorithm was used to simulate the color fringes in a CCD moiré pattern. We then performed a detailed analysis of the carrier field, and adopted a universal polynomial distortion model to characterize lens distortion, which increased the accuracy of distortion correction. Comparison experiments verified the feasibility of the modified method and the correctness of the formation mechanism for color CCD moiré. The modified method was then applied to lens distortion correction in the DIC measurement process, effectively reducing errors in displacement measurement.

镜头畸变的表征和校正是光学测量的重要组成部分。这项工作分析了彩色条纹和倍增莫尔条纹的形成机理，并讨论了彩色CCD莫尔条纹方法的修改，以校正透镜畸变。使用去马赛克算法模拟CCD莫尔图案中的色带。然后，我们对载流子场进行了详细分析，并采用了通用多项式畸变模型来表征镜头畸变，从而提高了畸变校正的准确性。对比实验证明了改进方法的可行性以及彩色CCD云纹形成机理的正确性。然后将改进的方法应用于DIC测量过程中的镜头畸变校正，有效地减少了位移测量中的误差。