分析了图像直方图均衡增强算法中信息损失的内在机理， 提 出基于自适应局部灰度修 正的直方图均衡算法。首先对图像作常规直方图均衡处理，然后分析比较处理后 图像和原图的梯度变化，以此为依据对图像作局部灰度修正，从而减小直方图均衡处理过程中信息损失的程度，最后通过实验验证了算法的有效性。-Analysis of the image histogram equalization enhancement algorithm in the loss of information inherent mechanism, proposed amendments based on adaptive local gray histogram equalization algorithm. First of all, the image for conventional histogram equalization, and then compare the image and the original image after processing the gradient changes as a basis for local image gray-level correction, thereby reducing the histogram equalization process in the extent of information loss, and finally Experimental results show the effectiveness of the algorithm.