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• W1481058826 abstract "Multi-index hashing (MIH) is the state-of-the-art method for indexing binary codes, as it divides long codes into substrings and builds multiple hash tables. However, MIH is based on the dataset codes uniform distribution assumption, and will lose efficiency in dealing with non-uniformly distributed codes. Besides, there are lots of results sharing the same Hamming distance to a query, which makes the distance measure ambiguous. In this paper, we propose a data-oriented multi-index hashing method. We first compute the covariance matrix of bits and learn adaptive projection vector for each binary substring. Instead of using substrings as direct indices into hash tables, we project them with corresponding projection vectors to generate new indices. With adaptive projection, the indices in each hash table are near uniformly distributed. Then with covariance matrix, we propose a ranking method for the binary codes. By assigning different bit-level weights to different bits, the returned binary codes are ranked at a finer-grained binary code level. Experiments conducted on reference large scale datasets show that compared to MIH the time performance of our method can be improved by 36.9%–87.4%, and the search accuracy can be improved by 22.2%." @default.
• W1481058826 created "2016-06-24" @default.
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• W1481058826 date "2015-06-01" @default.
• W1481058826 modified "2023-09-28" @default.
• W1481058826 title "Data-oriented multi-index hashing" @default.
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• W1481058826 doi "https://doi.org/10.1109/icme.2015.7177420" @default.
• W1481058826 hasPublicationYear "2015" @default.
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