一种改进的基于活动轮廓和光流的运动目标分割方法  

An improved moving objects segmentation method based on optical flow technique and active contour model

作　　者：方宇强[1] 戴斌[1] 宋金泽[1] 单恩忠[1] 

机构地区：[1]国防科学技术大学机电工程与自动化学院,湖南长沙410073

出　　处：《中南大学学报（自然科学版）》2011年第4期1035-1042,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金重点资助项目(90820302)

摘　　要：将光流技术和几何活动轮廓模型结合起来对运动目标进行分割,一方面可以通过算法分割出运动目标轮廓,另一方面,使得算法面对背景变化的情况仍具有一定的适应性。为了更好地将二者结合起来,进行2个方面的改进:建立基于运动边缘的几何活动轮廓模型,从而克服光流计算中由弱纹理区域产生的运动空洞对分割的影响;引入边缘增强的非线性扩散作为光流计算模型中的平滑项约束,可以在平滑流场的同时减小运动边缘处平滑效果而保护边缘,进而提高运动目标分割的完整性。研究结果表明:与现有算法相比较,该算法能够更准确地分割出运动目标的轮廓,同时在一定程度上克服背景运动的情况。Combining the optical flow technique and geometric active contour model to segment moving objects is a promising method.It not only can segment the contour of target accurately but also can be extended to the case with dynamic background.In order to combined these two techniques more effectively,two sides were improved： A new active contour model,which was based on motion edges,was proposed,so the impacts from low textured motion areas can be eliminated;reducing smoothing at those locations where edges in the flow field occur during the computation,the edge-enhancement nonlinear diffusion constraint was chosen as a smoothness term in optical flow computation.Then the flow field could preserve the motion discontinuities which were important information to segmentation,so a better segmentation result could be gotten.The experimental results show that this algorithm performs well,even in the situation of dynamic background.Compared with other methods,more accurate results can be gotten by this method.

关 键 词：光流 活动轮廓模型 非线性扩散 运动目标分割 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]