An Offline Bidirectional Tracking Scheme
An Offline Bidirectional Tracking Scheme
复制标题
一种离线双向跟踪方案
DOI：
10.1007/11558484_74
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发表时间：
2005
影响因子：
10.8
通讯作者：
H. Sahli
中科院分区：
文献类型：
--
作者：
Tom Caljon;V. Enescu;P. Schelkens;H. Sahli
提出了一种通用的双向方案，该方案增强了对视觉对象的状态的最大后验概率(MAP)序列的估计。它使创造性的、非技术用户能够在离线可用视频材料中获得有趣对象的路径，然后可以用于创建互动电影。为了抵抗跟踪器故障，提出的方案在一定时间步合并了前向跟踪粒子过滤器和后向跟踪粒子过滤器的滤波分布，使用了基于可靠性的投票方案，例如在民主一体化中。MAP状态序列是在从合并分布得到的每个时间步的简化状态集上使用维特比算法获得的，并且在怀疑跟踪失败的情况下被线性内插。该方法具有通用性强、算法简单、效率高等特点，在基于颜色的粒子滤波中取得了良好的效果。
A generic bi-directional scheme is proposed that robustifies the estimation of the maximum-a-posteriori (MAP) sequence of states of a visual object. It enables creative, non-technical users to obtain the path of interesting objects in offline available video material, which can then be used to create interactive movies. To robustify against tracker failure the proposed scheme merges the filtering distributions of a forward tracking particle filter and a backward tracking particle filter at some timesteps, using a reliability-based voting scheme such as in democratic integration. The MAP state sequence is obtained using the Viterbi algorithm on reduced state sets per timestep derived from the merged distributions and is interpolated linearly where tracking failure is suspected. The presented scheme is generic, simple and efficient and shows good results for a color-based particle filter.