Pawel Forczmanski, Dariusz Frejlichowski. Principal Component Analysis of Point Distance Histogram for Recognition of Stamp Silhouettes. In Ryszard S. Choras, editor, Image Processing and Communications Challenges 3 - 3rd International Conference, IP&C 2011, Proceedings. Volume 102 of Advances in Intelligent and Soft Computing, pages 219-226, Springer, 2011. [doi]