@InProceedings{tpcg04-eissele,
  author = {Eissele, M. and Weiskopf, D. and Ertl, T.},
  title  = {{Frame-to-Frame Coherent Halftoning in Image Space}},
  year   = {2004},
  pages  = {188-195},
  booktitle = {{Proceedings of Theory and Practice of Computer Graphics 2004}}
}