利用差分法配合灰度拉伸对颗粒运动图像进行了处理，直方图分析表明，像素在灰度上的分布特性与颗粒运动的剧烈程度具有相关性-Difference method with the use of gray stretch of particle motion image processing, histogram analysis showed that the pixels in the gray-scale distribution characteristics of particle motion