title: A fast approximate nearest neighbor search algorithm in the Hamming space.
abstract: A fast approximate nearest neighbor search algorithm for the (binary) Hamming space is proposed. The proposed Error Weighted Hashing (EWH) algorithm is up to 20 times faster than the popular locality sensitive hashing (LSH) algorithm and works well even for large nearest neighbor distances where LSH fails. EWH significantly reduces the number of candidate nearest neighbors by weighing them based on the difference between their hash vectors. EWH can be used for multimedia retrieval and copy detection systems that are based on binary fingerprinting. On a fingerprint database with more than 1,000 videos, for a specific detection accuracy, we demonstrate that EWH is more than 10 times faster than LSH. For the same retrieval time, we show that EWH has a significantly better detection accuracy with a 15 times lower error rate.
authors.affiliation: Electrical and Computer Engineering Department, University of British Columbia, 5500-2332 Main Mall, Vancouver, BC V6T 1Z4, Canada. manim@ece.ubc.ca
authors.forename: Mani Malek
authors.initials: MM
authors.lastname: Esmaeili
authors.forename: Rabab Kreidieh
authors.initials: RK
authors.lastname: Ward
authors.forename: Mehrdad
authors.initials: M
authors.lastname: Fatourechi
mesh_terms: D000465:Algorithms; D016208:Databases, Factual; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D010363:Pattern Recognition, Automated / Q000379:methods*; D014741:Video Recording