@inproceedings{Denzler97:RPT,<br>  title = {Real-Time Pedestrian Tracking in Natural Scenes},<br>  booktitle = {Computer Analysis of Images and Patterns, CAIP'97, Kiel 1997},<br>  author = {Joachim Denzler and Heinrich Niemann},<br>  year = {1997},<br>  pages = {42-49},<br>}<br>