对图像进行增强显示，有的图片因为光线问题拍的很黑，几乎看不到，这个就是对一个手的形状图片的恢复，经过图像增强后能看到清楚的手-Enhance the display of the image, some pictures because the light is shot very dark, almost invisible, this is the picture of a hand shape recovery after image enhancement can see clearly