Reference

Peltier, S., Ion, A., Haxhimusa, Y., Kropatsch, W., & Guillaume, D. (2007). Computing Homology Group Generators of Images Using Irregular Graph Pyramids. In Proceedings of the 15th International Workshop on Graph-based Representation for Pattern Recognition (pp. 283–294). Springer Lecture Notes in Computer Science. http://hdl.handle.net/20.500.12708/51962