@article {14214,
	title = {Directions of Motion Fields are Hardly Ever Ambiguous},
	journal = {International Journal of Computer Vision},
	volume = {26},
	year = {1998},
	month = {1998///},
	pages = {5 - 24},
	abstract = {If instead of the full motion field, we consider only the direction of the motion field due to a rigid motion, what can we say about the three-dimensional motion information contained in it? This paper provides a geometric analysis of this question based solely on the constraint that the depth of the surfaces in view is positive. The motivation behind this analysis is to provide a theoretical foundation for image constraints employing only the sign of flow in various directions and justify their utilization for addressing 3D dynamic vision problems.},
	isbn = {0920-5691},
	url = {http://dx.doi.org/10.1023/A:1007928406666},
	author = {Brodsky, Tomas and Ferm{\"u}ller, Cornelia and Aloimonos, J.}
}
