Abstract
Numerous methods have been proposed for person reidentification, most of which however neglect the matching
efficiency. Recently, several hashing based approaches have
been developed to make re-identification more scalable for
large-scale gallery sets. Despite their efficiency, these
works ignore cross-camera variations, which severely deteriorate the final matching accuracy. To address the above
issues, we propose a novel hashing based method for fast
person re-identification, namely Cross-camera Semantic Binary Transformation (CSBT). CSBT aims to transform original high-dimensional feature vectors into compact identitypreserving binary codes. To this end, CSBT first employs a
subspace projection to mitigate cross-camera variations, by
maximizing intra-person similarities and inter-person discrepancies. Subsequently, a binary coding scheme is proposed via seamlessly incorporating both the semantic pairwise relationships and local affinity information. Finally, a
joint learning framework is proposed for simultaneous subspace projection learning and binary coding based on discrete alternating optimization. Experimental results on four
benchmarks clearly demonstrate the superiority of CSBT
over the state-of-the-art methods.