遥感图像对比度的下降主要是由于光学系统调制传递函数（MTF）的下降导致的，MTF反映了光学系统分配光能的特性。根据图像的对比度下降原理，提出了一种基于光能分配的遥感图像增强方法，其基本过程是首先将图像低频部分的光能进行抑制，然后通过Gamma校正将减少的低频部分的光能重新分配到高频部分，得到对比度提高的增强图像。实验结果表明，该方法实现简单，且取得了较好的增强效果，适用于遥感图像的增强。

The contrast reduction of remote sensing images is mainly because of the reduction of the modulation transfer function(MTF)of the optical system.And MTF represents the characteristic of the light energy distribution of the optical system.By analyzing the theory of contrast reduction,this paper presents a remote sensing image enhancement method based on energy distribution.Firstly,the image energy at the low frequency domain is decreased,and then the decreased image energy is allocated to the high frequency domain to obtain the enhancement result.The experimental results demonstrate that the proposed method is simple and effective,which is feasible for remote sensing image enhancement.