| Titre : | Lagrange multiplier selection in wavelet-based scalable video coding for quality scalability |
| Auteurs : | Shuai Wan, Auteur ; Fuzheng Yang, Auteur ; Ebroul Izquierdo, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Signal processing. Image communication (Vol. 24 N° 9, Octobre 2009) |
| Article en page(s) : | pp. 730-739 |
| Note générale : | Electronique |
| Langues : | Anglais |
| Index. décimale : | 621.382 (Dispositifs électroniques utilisant les effets des corps solides. Dispositifs semi-conducteurs) |
| Tags : | Lagrange multiplier Scalable video coding Rate-distortion optimisation Wavelet |
| Résumé : |
In this paper, a method for Lagrange multiplier selection is proposed in the context of rate-distortion optimisation for wavelet-based scalable video coding targeting quality scalability.
Despite the prevalence of the conventional method for Lagrange multiplier selection in hybrid video coding, the underlying formulation is not applicable to wavelet-based scalable video coding. To address the inherent challenges, a thorough analysis of the rate-distortion models for transform video coding is provided with regard to low and middle-to-high bit-rates, respectively. Based on the analysis, the models are consolidated according to experimental observations and the consolidated rate-distortion models serve as the basis for the derivation of the Lagrange multiplier. Considering the influence of the open-loop prediction structure on the rate-distortion performance, the Lagrange multiplier is initially derived for a single-targeted bit-rate. Moreover, the method for Lagrange multiplier selection in scalable video coding aiming at multiple-targeted bit-rates is proposed in a general sense of bit-rate range, varying from low to high bit-rates, building on the initially derived Lagrange multiplier for a single-targeted bit-rate. The proposed Lagrange multiplier is content adaptive and well suited for wavelet-based scalable video coding where quantisation steps are unavailable. Detailed performance evaluation of the proposed method for wavelet-based scalable video coding is provided with regard to a given targeted bit-rate and multiple-targeted bit-rates, respectively. The experimental results have demonstrated the effectiveness of the proposed Lagrange multiplier for rate-distortion optimisation considering quality scalability in wavelet-based scalable video coding. |
| DEWEY : | 361.382 |
| ISSN : | 0923-5965 |
| En ligne : | http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235640%232009%23999759990%231477065%23FLA%23&_cdi=5640&_pubType=J&_auth=y&_acct=C000070790&_version=1&_urlVersion=0&_userid=6909337&md5=f54abdbee9665c1c561eefd05020b827 |
