TY - CONF T1 - Modeling and analysis of ordinal ranking in content fingerprinting T2 - Information Forensics and Security, 2009. WIFS 2009. First IEEE International Workshop on Y1 - 2009 A1 - Chuang,Wei-Hong A1 - Varna,A.L. A1 - M. Wu KW - detection; KW - detection;multimedia KW - fingerprinting;copy KW - Gaussian-distributed;content KW - identification;multimedia KW - objects;ordinal KW - processes;fingerprint KW - ranking;Gaussian KW - systems;object AB - Content fingerprinting provides a compact representation of multimedia objects for copy detection. This paper analyzes the robustness of the ordinal ranking module frequently used in content fingerprinting by examining the changes in ranks as local variations are introduced in feature values. Closed-form expressions to measure such sensitivity are derived when feature values are jointly Gaussian-distributed. The results show that sensitivity depends on the strength of local variation, the total number of blocks, and the correlations among block-based feature values. Experiments with both synthesized data and image data validate the analysis and provide interesting insights, inspiring an approach to reduce the sensitivity. JA - Information Forensics and Security, 2009. WIFS 2009. First IEEE International Workshop on M3 - 10.1109/WIFS.2009.5386472 ER -