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	WHEN CODEWORD FREQUENCY MEETS GEOGRAPHICAL LOCATION
	Ji, Rongrong ; Duan, Ling-Yu ; Chen, Jie ; Yao, Hongxun ; Gao, Wen
	2011
关键词	landmark search mobile search visual vocabulary codeword frequency geographical clustering
英文摘要	When codeword frequency meets geographical location in landmark search applications, is it still discriminative for the search procedure? In this paper, we give a systematic investigation about how geographical location affects the effectiveness of codeword frequency. We explain why the standard IDF in the BoW models is less effective in location related search applications [11][12]. Consequently, we propose a "location discriminative codeword frequency" strategy to introduce the location context into the codeword discriminability measurement. This new codeword frequency is calculated in each geographical region, for which a spectral clustering scheme is proposed to partition the geographical map of each city into distinct regions. Extensive comparisons over the standard codeword frequency in state-of-the-art landmark search systems [1][1] demonstrates our approach's effectiveness.; Acoustics; Engineering, Electrical & Electronic; Imaging Science & Photographic Technology; EI; CPCI-S(ISTP); 1
语种	英语
DOI标识	10.1109/ICASSP.2011.5946967
内容类型	其他
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/293098]
专题	信息科学技术学院
推荐引用方式 GB/T 7714	Ji, Rongrong,Duan, Ling-Yu,Chen, Jie,et al. WHEN CODEWORD FREQUENCY MEETS GEOGRAPHICAL LOCATION. 2011-01-01.

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