Reference
Zeppelzauer, M., Poier, G., Seidl, M., Reinbacher, C., Schulter, S., Breiteneder, C., & Bischof, H. (2016). Interactive 3D Segmentation of Rock-Art by Enhanced Depth Maps and Gradient Preserving Regularization. Journal on Computing and Cultural Heritage, 9. http://hdl.handle.net/20.500.12708/149989