G. Farneback

Very high accuracy velocity estimation using orientation tensors, parametric motion, and simultaneous segmentation of the motion field

G. Farneback, 2001, Proceedings Eighth IEEE International Conference on Computer Vision. ICCV 2001.

Fast and accurate motion estimation using orientation tensors and parametric motion models

G. Farneback, 2000, Proceedings 15th International Conference on Pattern Recognition. ICPR-2000.