Title :
Rate-adaptive Compact Fisher Codes for Mobile Visual Search
Author :
Jie Lin ; Ling-Yu Duan ; Yaping Huang ; Siwei Luo ; Tiejun Huang ; Wen Gao
Author_Institution :
Beijing Key Lab. of Trafiic Data Anal. & Min., Beijing Jiaotong Univ., Beijing, China
Abstract :
Extraction and transmission of compact descriptors are of great importance for next-generation mobile visual search applications. Existing visual descriptor techniques mainly compress visual features into compact codes of fixed bit rate, which is not adaptive to the bandwidth fluctuation in wireless environment. In this letter, we propose a Rate-adaptive Compact Fisher Codes (RCFC) to produce a bit rate scalable image signature. In particular, RCFC supports fast matching of descriptors based on Hamming distance; meanwhile, low memory footprint is offered. Extensive evaluation over benchmark databases shows that RCFC significantly outperforms the state-of-the-art and provides a promising descriptor scalability in terms of bit rates versus desired search performance.
Keywords :
Hamming codes; adaptive codes; data compression; image coding; image matching; mobile handsets; next generation networks; vocabulary; Hamming distance; RCFC; bandwidth fluctuation; bit rate scalable image signature; compact descriptor extraction; compact descriptor transmission; image matching; next-generation mobile visual search application; rate-adaptive compact Fisher code; visual descriptor technique; visual feature compression; wireless environment; Bit rate; Databases; Image coding; Mobile communication; Transform coding; Vectors; Visualization; Compact descriptors; Fisher vector; compression; mobile visual search; rate adaptation;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2013.2296532