嫦娥三号卫星相机地形图像的彩色校正方法

针对嫦娥三号卫星着陆器有效载荷相机地形图像出现偏色问题，设计一种彩色定标与白平衡相结合的两步彩色校正方法。首先在D65标准光源下，针对相机彩色光谱响应与CIE标准色匹配函数偏差，利用24色彩色色标最小二乘平差获取相机彩色校正矩阵，提高校正矩阵对不同色彩图像的适应性；其次在模拟月面环境光照条件下，采用9阶中性色标最小二乘平差进行相机白平衡校正，改进传统单一色标白平衡校正系数泛化能力不足的缺点，有效降低月面环境光照条件对相机图像色彩影响。地面成像验证试验和在轨成像试验结果表明，两步法校正后相机成像色差明显降低，图像色彩与人眼所见更加一致。

A Method of Color Correction for Chang’E 3 Satellite Camera Topography Image

A novel two-step color correction method of Chang’E-3(CE-3) satellite camera topography image based on color calibration and white balance model is proposed in the light of the fact that the color spectrum response of camera differs from the CIE criterion, and the image color of camera is aberrant under influence of illumination on the lunar surface. Firstly, the hue correction matrix is obtained standard light source by using the least square of 24 kinds of standard color method，to enhance the adaptability of the color correction coefficient matrix to different color images. Secondly, 9 rank white balance under simulative illumination of moon is applied to improve the adaptability of white balance coefficient matrix and reduce the influence of illumination on the lunar surface. The experimental results on the ground and on the moon show that the color difference of image based on proposed method is lower, and the corrected color of image is more consistent with the human eyes.