2016年6月15日上午，环球360游戏网址/软件学院特邀讲者计划学术讲座在软件园校区行政楼第一会议室举行，应邀来访的美国德克萨斯大学圣安东尼奥分校的田奇教授在软件园校区做了题为“Large-scale Visual Search”的学术报告，陈宝权教授主持报告会。

在报告中，田奇教授讲述了在大量社会多媒体数据与移动可视搜索应用的伴随下，针对于大规模的可视搜索与识别技术正在迅猛发展。利用局部不变的可视特征，最近几十年我们已经见证了大规模图像搜索的快速发展。现在最优的图像搜索算法与系统是受到经典的bag-of-visual-words模型和尺度可变的索引框架的启发。一般情况下，一个图像搜索系统涉及几个关键部分，包括特征提取，可视码本的建立，特征量化，索引策略，评分系统和后处理。另外，后处理技术可以提高索引性能。

环球360游戏网址/软件学院于2015年开始设立杰出讲者和特邀讲者计划，目的是邀请计算机学科学术造诣深厚，学术贡献突出，在国内外享有盛誉的著名学者来学院讲学和开展合作研究，推动学院学术交流与合作，提升学院的学术影响力和国际知名度。

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报告摘要：

Coupled with the massive social multimedia data and mobile visual search applications, techniques towards large-scale visual search and recognition are emerging. With the introduction of local invariant visual features, recent decade has witnessed the fast advance of large-scale image search. Current state-of-the-art image search algorithms and systems are motivated by the classic bag-of-visual-words model and the scalable index structure. Generally, an image search system is involved with several key modules, including feature representation, visual codebook construction, feature quantization, index strategy, scoring scheme, and post processing. Besides, post-processing techniques, such as geometric verification, query expansion and multi-modal fusion, can be plugged in to boost the retrieval performance.

In the first part of the talk, Prof. Tian introduced those related works in each module as mentioned above and discuss the key research problems. In the second part, He introduced their research work on large scale image search. They have done comprehensive work on feature representation, feature quantization, scalable indexing, spatial verification, et al. Several representative works will be discussed and the related demos will be shown. On feature representation, He introduced their two recent works, i.e., Binary SIFT and Edge-SIFT, which are both binary local features derived from or inspired by SIFT. On feature quantization, He introduced their recent research based on codebook-training-free strategy for large-scale image search.  On image indexing, a novel co-indexing scheme will be discussed, which is designed to couple the distance metrics of multiple visual features. Finally, He introduced an efficient geometric verification scheme which is demonstrated effective in boosting the performance of large-scale partial-duplicate image search.  In the third part, he discussed the potential research directions and promising applications on large scale image search.

田奇教授简介：

Qi Tian is currently a Full Professor in the Department of Computer Science, the University of Texas at San Antonio (UTSA). During 2008-2009, he took one-year Faculty Leave at Microsoft Research Asia (MSRA) in the Media Computing Group. He received his Ph.D. in ECE from University of Illinois at Urbana-Champaign (UIUC) in 2002 and his B.E and M.S degrees from Tsinghua University and Drexel University in 1992 and 1996, respectively, all from electronic engineering. Dr. Tian’s research interests focus on multimedia information retrieval and computer vision and published over 290 refereed journal and conference papers. He received the Best Paper Awards in ACM ICMR 2015, PCM 2013, ACM ICIMCS 2012 and MMM 2013, a Top 10% Paper Award in MMSP 2011, the Best Student Paper Award in ICASSP 2006, and was a co-author of a Best Paper Candidate in PCM 2007 and co-author of a Best Student Paper Candidate in IEEE ICME 2016. His research projects are funded by NSF, ARO, DHS, Google, FXPAL, NEC, SALSI, CIAS, Akiira Media Systems, HP and UTSA. He received 2010 ACM Service Award. He is the Associate Editor of IEEE Transactions on Circuits and Systems for Video Technology (TCSVT), IEEE Transactions on Multimedia, ACM Transactions on Multimedia Computing, Communications, and Applications (TOMM), and in the Editorial Board of Journal of Multimedia (JMM) and Journal of Machine Vision and Applications (MVA), and is the Guest Editors of IEEE Transactions on Multimedia, Journal of Computer Vision and Image Understanding, etc.

Dr. Tian is a guest professor at Zhejiang University, University of Science and Technology of China (USTC), Xidian University, Xi’an Jiaotong University, Institute of Computing Technology, Chinese Academy of Science, and a Chaired Professor at Tsinghua University.  Dr. Tian is also an Oversea Expert for Chinese Academy of Science.  He is a Fellow of IEEE.

交叉研究中心供稿