Ya-Dong Wang Jian-Kang Wu Ashraf A. Kassim Weimin Huang Data-Driven Probability Hypothesis Density Filter for Visual Tracking. 1085-1095 2008 18 IEEE Trans. Circuits Syst. Video Techn. 8 http://dx.doi.org/10.1109/TCSVT.2008.927105 db/journals/tcsv/tcsv18.html#WangWKH08