说明：  新的增强图像灰度方法!经过反 Gamma 校正后的低灰度级图像，在图像进行反 Gamma 校正后，根据图像原始灰度与二进制编码灰度之差建立浮动灰度编码
(A new method to enhance the gray level of the image! After the anti gamma correction of the low gray level image, the image is anti gamma After correction, the floating gray-scale coding is established according to the difference between the original gray-scale and the binary coding gray-scale)