@INCOLLECTION{WBBP05,   author = {J. Weickert and A. Bruhn and T. Brox and N. Papenberg} ,   title = {A survey on variational optic flow methods for small displacements} ,   editor = {O. Scherzer} ,   volume = {10} ,   year = {2006} ,   booktitle = {Mathematical Models for Registration and Applications to Medical Imaging} ,   address = {Berlin} ,   publisher = {Springer} ,   series = {Mathematics in Industry} , }