演讲人: Chong-Wah Ngo

讲座时间: 2014-05-15（星期四）下午5点-6点

讲座地点: 信息楼417

讲座内容: In real-life, it is easier to provide a visual cue when asking a question about a possibly unfamiliar topic, for example, asking the question, “Where was this crop circle found?”. Providing an image of the instance is far more convenient than texting a verbose description of the visual properties, especially when the name of the query instance is not known. Nevertheless, having to identify the visual instance before processing the question and eventually returning the answer makes multimedia-based question-answering technically challenging. In this talk, I will introduce a system recently built based on visual instance search to address this problem. The system performs search in a million-scale image dataset in order to mine the name of instance, and then use the name to search for similar question-answer pairs from Yahoo! Answer. The system is evaluated on a wide range of visual instances (e.g., fashion, art, food, pet, logo, and landmark) over various QA categories (e.g., factoid, definition, how-to, and opinion). 演讲人简介： Chong-Wah Ngo is an associate professor in the Dept. of Computer Science at the City University of Hong Kong. He received his PhD in Computer Science from Hong Kong University of Science & Technology (HKUST), and MSc and BSc, both in Computer Engineering, from Nanyang Technological University of Singapore. Before joining City University of Hong Kong, he was a postdoctoral scholar in Beckman Institute at the University of Illinois in Urbana-Champaign (UIUC). He was also a visiting researcher of Microsoft Research Asia. His recent research interests include large-scale multimedia information retrieval and mining, video summarization and browsing. He is the founding leader of video retrieval group (VIREO) in City University. He is currently the associate editor of IEEE Transactions on Multimedia. He serves as the technical program committees of various multimedia conferences, including as the conference co-chair of ICMR 2015, PCM 2014, the program co-chair of ICMR 2012, MMM 2012, and the area co-chair of ACM Multimedia 2012 and ICME 2013. He served as the chairman of ACM (Hong Kong Chapter) during 2008-2009.