Multiple Binary Codes for Fast Approximate Similarity Search

Shinichi SHIRAKAWA  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E98-D   No.3   pp.671-680
Publication Date: 2015/03/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2014EDP7212
Type of Manuscript: PAPER
Category: Pattern Recognition
Keyword: 
similarity search,  binary hash,  approximate nearest neighbor search,  machine learning,  image retrieval,  

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Summary: 
One of the fast approximate similarity search techniques is a binary hashing method that transforms a real-valued vector into a binary code. The similarity between two binary codes is measured by their Hamming distance. In this method, a hash table is often used when undertaking a constant-time similarity search. The number of accesses to the hash table, however, increases when the number of bits lengthens. In this paper, we consider a method that does not access data with a long Hamming radius by using multiple binary codes. Further, we attempt to integrate the proposed approach and the existing multi-index hashing (MIH) method to accelerate the performance of the similarity search in the Hamming space. Then, we propose a learning method of the binary hash functions for multiple binary codes. We conduct an experiment on similarity search utilizing a dataset of up to 50 million items and show that our proposed method achieves a faster similarity search than that possible with the conventional linear scan and hash table search.