tailieunhanh - Báo cáo hóa học: "Research Article Talking-Face Identity Verification, Audiovisual Forgery, and Robustness Issues"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Talking-Face Identity Verification, Audiovisual Forgery, and Robustness Issues | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2009 Article ID 746481 15 pages doi 2009 746481 Research Article Talking-Face Identity Verification Audiovisual Forgery and Robustness Issues Walid Karam 1 Herve Bredin 2 Hanna Greige 3 Gerard Chollet 4 and Chafic Mokbel1 Computer Science Department University of Balamand 100 El-Koura Lebanon 2SAMoVA Team IRIT-UMR 5505 CNRS 5505 Toulouse France 3Mathematics Department University of Balamand 100 El-Koura Lebanon 4 TSI Ecole Nationale Superieure des Telecommunications 46 rue Barrault 75634 Paris France Correspondence should be addressed to Walid Karam walid@ Received 1 October 2008 Accepted 3 April 2009 Recommended by Kevin Bowyer The robustness of a biometric identity verification IV system is best evaluated by monitoring its behavior under impostor attacks. Such attacks may include the transformation of one many or all of the biometric modalities. In this paper we present the transformation of both speech and visual appearance of a speaker and evaluate its effects on the IV system. We propose MixTrans a novel method for voice transformation. MixTrans is a mixture-structured bias voice transformation technique in the cepstral domain which allows a transformed audio signal to be estimated and reconstructed in the temporal domain. We also propose a face transformation technique that allows a frontal face image of a client speaker to be animated. This technique employs principal warps to deform defined MPEG-4 facial feature points based on determined facial animation parameters FAPs . The robustness of the IV system is evaluated under these attacks. Copyright 2009 Walid Karam et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. Introduction With the emergence of smart phones and third and fourth