Christos Theoharatos Vasileios K. Pothos Nikolaos A. Laskaris George Economou Spiros Fotopoulos Multivariate image similarity in the compressed domain using statistical graph matching. 1892-1904 2006 39 Pattern Recognition 10 http://dx.doi.org/10.1016/j.patcog.2006.04.015 db/journals/pr/pr39.html#TheoharatosPLEF06