应用于车牌识别中图像增强部分的对比度增强部分！（试了，出的图像效果对比效果比较明显）,License Plate Recognition used in image enhancement part of the contrast enhancement part! (Tried out the effect of the image contrast more obvious)

对比度增强。原始图的直方图变换为均匀分布的形式，这样就增加了象素灰度值的动态范围从而达到增强对比度的效果-Contrast enhancement. Original graph transform histogram form for the uniform distribution, thus increasing the pixel gray value of the dynamic range so as to achieve the effect of contrast enhance