在阐述图象灰度分布直方图指数平滑处理的基础上，提出了直方图阈值、峰点的自动检测算法。实验结果表明，本文提出的方法不仅算法简单、运行速度快，而且检测出的阈值、峰点也较为准确、合理。 Based on expatiating on the exponential smoothing of histogram of gray distribution, an automatic detection algorithm of histogram threshold and peak point is proposed. The experimental results show that the proposed method not only has the advantages of simple algorithm and fast running speed, but also the thresholds and peak points detected are more accurate and reasonable.