说明：  直方图均衡能有效地对数字图像进行增强处理，其主要缺点是处理后的数字图像大量损失灰度层次，且增强力度不够．提出了在子块部分重叠直方图均衡的基础上，引入保留灰度级直方图均衡 理的方法，使得处理后 的图像对比度得到较大的增强，又不损失灰 度级，且相邻像素间灰度过渡平 ，图像柔和、真实．针对处理后方块效应严 重的图像，依据人眼的视觉特性和数字图像数据的特，提出了自适应行列分比例方法来有效消除块效应．
(Histogram equalization can effectively enhance the digital image processing, its main drawback is the treatment of significant loss of gray-scale digital image level, and strengthen weak. Proposed overlap in the sub-block histogram equalization, based on the introduction of gray-scale histogram equalization reserves management approach, making the processed image contrast is greatly enhanced, without loss of gray-scale, and the adjacent pixels transition level grayscale, image soft and true. Dealing with the serious effects of the image block, based on human visual characteristics and the characteristics of digital image data, the percentage of the ranks of proposed adaptive method to effectively reduce blocking artifacts.)