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2. Visual interpretation of known objects in constrained scenes;Sullivan;Phil. Trans. R. Soc. London B,1992
3. Video image-processing techniques and their application to pedestrian data collection;Rouke,1992
4. Analysis of crowd movements and densities in built-up environments using image processing;Velatsin,1993
5. A vision system for estimating people flow;Del Bimbo,1993