“…Visual object tracking in video sequences is a central concern within the field of computer vision. Reliable visual tracking is indispensable in many emerging vision applications, such as automatic video surveillance [1, 2], human computer interface [3, 4], video compression [5, 6] and robotics [7, 8]. However, the task of robust tracking is very challenging regarding illumination variation, background clutter, fast motion, occlusion, structural deformation, real-time restriction, etc.…”