Xiaomeng Wu Masao Takimoto Shin'ichi Satoh Jun Adachi Scene duplicate detection based on the pattern of discontinuities in feature point trajectories. 51-60 2008 ACM Multimedia http://doi.acm.org/10.1145/1459359.1459367 conf/mm/2008 db/conf/mm/mm2008.html#WuTSA08