**4.2 Surveillance object retrieval results**

In recent years, a number of surveillance video retrieval results have been published. However, with the lack of common benchmarks and databases, the comparison of these results is difficult (even impossible). Two preliminary comparisons of three object signature building and object matching methods with CAVIAR and CARETAKER dataset have been presented in (Le, Thonnat et al. 2009a) (Le, Thonnat et al. 2009). However, these comparisons are done with a relatively small dataset.
