VIREO@TRECVID 2012: Searching with Topology, Recounting will Small Concepts, Learning with Free Examples
Wei Zhang, Chun Chet Tan, Shiai Zhu, Ting Yao, Lei Pang, Chong‐Wah Ngo · Singapore Management University Institutional Knowledge (InK) (Singapore Management University) · 2012
The vireo group participated in four tasks: instance search, multimedia event recounting, multimedia event detection, and semantic indexing. In this paper, we will present our approaches and discuss the evaluation results. Instance Search (INS): We submitted four Bag-of-Words (BoW) based runs this year to mainly test the proper way of exploiting spatial information through comparing the weak consistency checking (WGC) and our spatial topology consistency checking using Delaunay Triangulation (DT) based matching. Considering the special features of the INS task of TRECVID (e.g., multiple image examples for a query; ROI indicating the spatial location of the instance), we also study the effects of multi-query fusion and background context modeling on top of BoW retrieval system.