The WSL-appearance model is described in the CVPR 2001 paper:

A.D. Jepson, D.J. Fleet, and T.F. El-Maraghi, Robust online appearance models for visual tracking, IEEE CVPR, 2001.

The Dudek face sequence (html) is now available on-line. That page includes a link to the 1145 frame sequence used in the CVPR '01 paper above, along with seven ground truth points located by hand for benchmarking purposes. This ground truth data was first used in:

A.D. Jepson, D.J. Fleet, and T.F. El-Maraghi, Robust online appearance models for visual tracking, submitted IEEE PAMI, 2002.

The following MPEG files show tracking results using the WSL-appearance model:

1. The Dudek face sequence shows tracking in the presence of partial occlusion and also appearance changes due to changes in the 3D pose, changes in facial expression. MPEG (9MB)
   
   
2. The Fleet equip sequence shows tracking in the presence of significant and persistent partial occlusion. MPEG (2MB)
   
   
3. The Fleet face sequence shows tracking in the presence of appearance change. Near the end of the sequence the subject stops and turns. The appearance model then learns the background, and when the subject starts to move again the tracking fails. MPEG (5MB)
   
   
4. The Fleet car sequence shows tracking in the presence of appearance change as the subject rotates 180 degrees, resulting in a large variation of appearance. The end of the sequence also demonstrates persistent total occlusion, which causes the tracking to fail. MPEG (6MB)