[article]
| Titre : |
Lagrange multiplier selection in wavelet-based scalable video coding for quality scalability |
| Type de document : |
texte imprimé |
| Auteurs : |
Shuai Wan, Auteur ; Fuzheng Yang, Auteur ; Ebroul Izquierdo, Auteur |
| Article en page(s) : |
pp. 730-739 |
| Note générale : |
Electronique |
| Langues : |
Anglais (eng) |
| Mots-clés : |
Lagrange multiplier Scalable video coding Rate-distortion optimisation Wavelet |
| Index. décimale : |
621.382 Dispositifs électroniques utilisant les effets des corps solides. Dispositifs semi-conducteurs |
| 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%23 [...] |
in Signal processing. Image communication > Vol. 24 N° 9 (Octobre 2009) . - pp. 730-739
[article] Lagrange multiplier selection in wavelet-based scalable video coding for quality scalability [texte imprimé] / Shuai Wan, Auteur ; Fuzheng Yang, Auteur ; Ebroul Izquierdo, Auteur . - pp. 730-739. Electronique Langues : Anglais ( eng) in Signal processing. Image communication > Vol. 24 N° 9 (Octobre 2009) . - pp. 730-739
| Mots-clés : |
Lagrange multiplier Scalable video coding Rate-distortion optimisation Wavelet |
| Index. décimale : |
621.382 Dispositifs électroniques utilisant les effets des corps solides. Dispositifs semi-conducteurs |
| 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%23 [...] |
|
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