12th IEEE International Workshop on Performance Evaluation of Tracking and Surveillance (Winter-PETS '09) (concurrent with WACV and WMVC/Motion as part of the IEEE Winter Vision Multi-Meetings, December 7-10 2009, Snowbird, Utah) http://winterpets09.net The aim of this workshop is to evaluate the application of video surveillance algorithms/systems for crowd image analysis. Specifically, crowd count and density estimation, tracking of individual(s) within a crowd, and detection of flow and specific crowd events. The scenarios are filmed from up to 8 cameras and involve multiple actors. Papers are solicited which: * Describe an approach to address one or more of the crowd image analysis tasks, and include evaluation of the results obtained on the PETS 2009 datasets. -- OR -- * Contribute to performance evaluation methodologies for crowd image analysis. Deadline for electronic paper submission: 11th September 2009