| 1. | Afterwards , to decrease noise which is brought by complex background , the method of morphological filter is used . planar velocity field in the moving area can be estimated through optical flow analysis 在第一步检测的基础上,应用经过了部分改进的光流场算法,比较精确地提取出运动目标,并计算出目标的速度大小和方向。 |