用直方图均衡化对图像进行处理。直方图均衡化主要用于增强动态范围偏小的图像的反差。该方法的基本思想是把原始的直方图变换为均匀分布的形状，这样就增加了像素灰度值的动态范围，从而达到增强图像整体对比度的效果。-Histogram equalization on the image processing. Histogram equalization is used to enhance the contrast of the image dynamic range is small. The basic idea of 琠栀攀 method of converting the original histogram as a uniform distribution of shape, thus increasing the dynamic range of the pixel gray values, thereby to enhance the effect of the overall image contrast.