本文提出了一种可以衡量带通傅里叶频率系数的低频含量大小的环形条带对比度定义，以该对比度为基础的影像增强方法有效改善了降质月面影像视觉效果，有利于降质月面影像数据的后续处理及应用。借助改进的遗传算法实现了综合考虑绝对质量测度及相对质量测度的增强参数的自适应优化选取。实验结果表明本文方法不仅保持了原始数据的基本信息还提高了其各项绝对质量测度，但由于遗传算法优化处理时计算量较大，本文方法还存在计算速度较慢的不足。Domain of Degraded Image Achieved by Chang’E-1 Orbiter

A band-annular contrast measurement is proposed, which provides the ratio of the low frequency content of the band pass block. The image enhancement method based on the band-annular contrast improves visual effect of degraded image and provides convenience for further process and application of degraded images achieved by Chang’E-1 orbiter. The parameter of enhancement for considering absolute quality measure and relative quality measure is optimized by advanced genetic algorithms. The results of contrast experiment show that the discussed method can not only keep the basic information of images but also increase absolute quality measure. However, it costs time when genetic algorithms optimizing the parameter of enhancement.