Joint optimization coding for level and map information in H.264/AVC / Xingsong Hou in Signal processing. Image communication, Vol. 26 N° 8-9 (Octobre 2011)  

Public ISBD [article]  inSignal processing. Image communication > Vol. 26 N° 8-9 (Octobre 2011) . - pp. 507–517 Titre : Joint optimization coding for level and map information in H.264/AVC Type de document : texte imprimé Auteurs : Xingsong Hou, Auteur ; Duan Xue, Auteur ; Baiping Jin, Auteur Année de publication : 2012 Article en page(s) : pp. 507–517 Note générale : Electronique Langues : Anglais (eng) Mots-clés : Coefficients pruning Joint optimization coding H.264 Résumé : Since the joint optimization coding for the level and the map information of transformed coefficients has been applied to the image coding successfully, this paper addresses the problem of how to optimize the two parts of information of residual coefficients jointly in the state-of-the-art video coding standard—H.264/AVC. In order to solve this problem, this paper presents a pruning method to zero out residual coefficients, which are not valuable for encoding in rate-distortion optimization (RDO) sense. Furthermore, a joint optimization scheme is presented to combine scalar quantization with this pruning method together to further improve the compression performance of the proposed algorithm. Experiments have been conducted based on the reference encoder JM12.4 of H.264/AVC. Comparative studies show that the proposed joint coding method can achieve a PSNR gain more than 0.5 dB at a certain bit rate, compared with the coding method in the H.264/AVC. Especially, the PSNR gain can reach up to 0.9 dB, or equivalently, 17% bit rate saving can be achieved at some special cases. ISSN : 0923-5965 En ligne : http://www.sciencedirect.com/science/article/pii/S0923596511000762 [article] Joint optimization coding for level and map information in H.264/AVC [texte imprimé] / Xingsong Hou, Auteur ; Duan Xue, Auteur ; Baiping Jin, Auteur . - 2012 . - pp. 507–517. Electronique Langues : Anglais (eng) in Signal processing. Image communication > Vol. 26 N° 8-9 (Octobre 2011) . - pp. 507–517 Mots-clés : Coefficients pruning Joint optimization coding H.264 Résumé : Since the joint optimization coding for the level and the map information of transformed coefficients has been applied to the image coding successfully, this paper addresses the problem of how to optimize the two parts of information of residual coefficients jointly in the state-of-the-art video coding standard—H.264/AVC. In order to solve this problem, this paper presents a pruning method to zero out residual coefficients, which are not valuable for encoding in rate-distortion optimization (RDO) sense. Furthermore, a joint optimization scheme is presented to combine scalar quantization with this pruning method together to further improve the compression performance of the proposed algorithm. Experiments have been conducted based on the reference encoder JM12.4 of H.264/AVC. Comparative studies show that the proposed joint coding method can achieve a PSNR gain more than 0.5 dB at a certain bit rate, compared with the coding method in the H.264/AVC. Especially, the PSNR gain can reach up to 0.9 dB, or equivalently, 17% bit rate saving can be achieved at some special cases. ISSN : 0923-5965 En ligne : http://www.sciencedirect.com/science/article/pii/S0923596511000762

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