Ayesha Choudhary Manish Pal Subhashis Banerjee Santanu Chaudhury Unusual Activity Analysis Using Video Epitomes and pLSA. 390-397 2008 ICVGIP http://dx.doi.org/10.1109/ICVGIP.2008.89 conf/icvgip/2008 db/conf/icvgip/icvgip2008.html#ChoudharyPBC08