Documents disponibles écrits par cet auteur

An integrated visual saliency-based watermarking approach for synchronous image authentication and copyright protection / Lihua Tian in Signal processing. Image communication, Vol. 26 N° 8-9 (Octobre 2011) 

Public ISBD [article]  in Signal processing. Image communication > Vol. 26 N° 8-9 (Octobre 2011) . - pp. 427–437 Titre : An integrated visual saliency-based watermarking approach for synchronous image authentication and copyright protection Type de document : texte imprimé Auteurs : Lihua Tian, Auteur ; Nanning Zheng, Auteur ; Jianru Xue, Auteur Année de publication : 2012 Article en page(s) : pp. 427–437 Note générale : Electronique Langues : Anglais (eng) Mots-clés : Watermarking  Image  authentication  Visual  saliency  Tamper  detection  and  localization Résumé : This paper proposes an integrated visual saliency-based watermarking approach, which can be used for both synchronous image authentication and copyright protection. Firstly, regions of interest (ROIs), which are not in a fixed size and can present the most important information of one image, would be extracted automatically using the proto-object based saliency attention model. Secondly, to resist common signal processing attacks, for each ROI, an improved quantization method is employed to embed the copyright information into its DCT coefficients. Finally, the edge map of one ROI is chosen as the fragile watermark, and is then embedded into the DWT domain of the watermarked image to further resist the tampering attacks. Using ROI-based visual saliency as a bridge, this proposed method can achieve image authentication and copyright protection synchronously, and it can also preserve much more robust information. Experimental results on standard benchmark demonstrate that compared with the state-of-the-art watermarking scheme, the proposed method is more robust to white noise, filtering and JPEG compression attacks. Furthermore, it also shows that the proposed method can effectively detect tamper and locate forgery. ISSN : 0923-5965 En ligne : http://www.sciencedirect.com/science/article/pii/S0923596511000671 [article] An integrated visual saliency-based watermarking approach for synchronous image authentication and copyright protection [texte imprimé] / Lihua Tian, Auteur ; Nanning Zheng, Auteur ; Jianru Xue, Auteur . - 2012 . - pp. 427–437. Electronique Langues : Anglais (eng) in Signal processing. Image communication > Vol. 26 N° 8-9 (Octobre 2011) . - pp. 427–437 Mots-clés : Watermarking  Image  authentication  Visual  saliency  Tamper  detection  and  localization Résumé : This paper proposes an integrated visual saliency-based watermarking approach, which can be used for both synchronous image authentication and copyright protection. Firstly, regions of interest (ROIs), which are not in a fixed size and can present the most important information of one image, would be extracted automatically using the proto-object based saliency attention model. Secondly, to resist common signal processing attacks, for each ROI, an improved quantization method is employed to embed the copyright information into its DCT coefficients. Finally, the edge map of one ROI is chosen as the fragile watermark, and is then embedded into the DWT domain of the watermarked image to further resist the tampering attacks. Using ROI-based visual saliency as a bridge, this proposed method can achieve image authentication and copyright protection synchronously, and it can also preserve much more robust information. Experimental results on standard benchmark demonstrate that compared with the state-of-the-art watermarking scheme, the proposed method is more robust to white noise, filtering and JPEG compression attacks. Furthermore, it also shows that the proposed method can effectively detect tamper and locate forgery. ISSN : 0923-5965 En ligne : http://www.sciencedirect.com/science/article/pii/S0923596511000671

Hash key-based video encryption scheme for H.264/AVC / Xiaofeng Wang in Signal processing. Image communication, Vol. 25 N° 6 (Juillet 2010) 

Public ISBD [article]  in Signal processing. Image communication > Vol. 25 N° 6 (Juillet 2010) . - pp. 427–437 Titre : Hash key-based video encryption scheme for H.264/AVC Type de document : texte imprimé Auteurs : Xiaofeng Wang, Auteur ; Nanning Zheng, Auteur ; Lihua Tian, Auteur Année de publication : 2012 Article en page(s) : pp. 427–437 Note générale : Electronique Langues : Anglais (eng) Mots-clés : Video  encryption  H.264/AVC  Intra-prediction  mode  Motion  vector  difference  Quantization  coefficient  Hash  function Résumé : An improved H.264/AVC comprehensive video encryption scheme is proposed. In the proposed scheme, the intra-prediction mode, motion vector difference, and quantization coefficients are encrypted. A novel hierarchical key generation method is likewise proposed, in which the encryption keys are generated based on the cryptographic hash function. Generated frame keys are consistent with the corresponding frame serial numbers, which can ensure frame synchronization in the decrypting process when frame loss occurs. This function provides the property that our scheme is secure against some special attacks for video, such as the frame regrouping attack and frame erasure attack. Our method not only avoids the distribution of encryption keys, but also increases the security. Experimental results show that the proposed scheme is efficient in computing, the encryption process does not affect the compression ratio greatly, and the encryption/decryption process hardly affects the video quality. ISSN : 0923-5965 En ligne : http://www.sciencedirect.com/science/article/pii/S0923596510000366 [article] Hash key-based video encryption scheme for H.264/AVC [texte imprimé] / Xiaofeng Wang, Auteur ; Nanning Zheng, Auteur ; Lihua Tian, Auteur . - 2012 . - pp. 427–437. Electronique Langues : Anglais (eng) in Signal processing. Image communication > Vol. 25 N° 6 (Juillet 2010) . - pp. 427–437 Mots-clés : Video  encryption  H.264/AVC  Intra-prediction  mode  Motion  vector  difference  Quantization  coefficient  Hash  function Résumé : An improved H.264/AVC comprehensive video encryption scheme is proposed. In the proposed scheme, the intra-prediction mode, motion vector difference, and quantization coefficients are encrypted. A novel hierarchical key generation method is likewise proposed, in which the encryption keys are generated based on the cryptographic hash function. Generated frame keys are consistent with the corresponding frame serial numbers, which can ensure frame synchronization in the decrypting process when frame loss occurs. This function provides the property that our scheme is secure against some special attacks for video, such as the frame regrouping attack and frame erasure attack. Our method not only avoids the distribution of encryption keys, but also increases the security. Experimental results show that the proposed scheme is efficient in computing, the encryption process does not affect the compression ratio greatly, and the encryption/decryption process hardly affects the video quality. ISSN : 0923-5965 En ligne : http://www.sciencedirect.com/science/article/pii/S0923596510000366