能够根据设定的比例参数裁去直方图中灰度值最小和最大的一部分像素值，然后将灰度值归一化，（后期处理可以自行将灰度值拉伸至需要的动态范围）能够提升图像的对比度。-Parameter setting can be cut according to the proportion of gray value histogram to the minimum and maximum portion of the pixel value, and then the gray value normalization, (post-processing can be stretched to its own gray value required dynamic range) can enhance the contrast of the image.