This paper presents the results of the crowd image analysis\ud challenge of the Winter PETS 2009 workshop. The evaluation\ud is carried out using a selection of the metrics developed\ud in the Video Analysis and Content Extraction (VACE)\ud program and the CLassification of Events, Activities, and\ud Relationships (CLEAR) consortium . The evaluation\ud highlights the detection and tracking performance of the authors’systems in areas such as precision, accuracy and robustness. The performance is also compared to the PETS\ud 2009 submitted results
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