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- W2103376795 abstract "In this paper, we study the problem of visual object retrieval by introducing a dictionary of contextual synonyms to narrow down the semantic gap in visual word quantization. The basic idea is to expand a visual word in the query image with its synonyms to boost the retrieval recall. Unlike the existing work such as soft-quantization, which only focuses on the Euclidean (l2) distance in descriptor space, we utilize the visual words which are more likely to describe visual objects with the same semantic meaning by identifying the words with similar contextual distributions (i.e. contextual synonyms). We describe the contextual distribution of a visual word using the statistics of both co-occurrence and spatial information averaged over all the image patches having this visual word, and propose an efficient system implementation to construct the contextual synonym dictionary for a large visual vocabulary. The whole construction process is unsupervised and the synonym dictionary can be naturally integrated into a standard bag-of-feature image retrieval system. Experimental results on several benchmark datasets are quite promising. The contextual synonym dictionary-based expansion consistently outperforms the l2 distance-based soft-quantization, and advances the state-of-the-art performance remarkably." @default.
- W2103376795 created "2016-06-24" @default.
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- W2103376795 date "2011-11-28" @default.
- W2103376795 modified "2023-10-03" @default.
- W2103376795 title "Contextual synonym dictionary for visual object retrieval" @default.
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- W2103376795 doi "https://doi.org/10.1145/2072298.2072364" @default.
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