EFFICIENT QUANTIZATION PARAMETER ESTIMATION IN HEVC BASED ON ρ-DOMAIN

Thibaud Biatek (1) , Mickaël Raulet (2) , J.-F Travers (3) , Olivier Deforges (2)

1 IRT b-com - Institut de Recherche Technologique b-com
2 IETR - Institut d'Électronique et des Technologies du numéRique
3 TDF - TéléDiffusion de France

This paper proposes a quantization parameter estimation algorithm for HEVC CTU rate control. Several methods were proposed, mostly based on Lagrangian optimization combined with Laplacian distribution for transformed coeffi-cients. These methods are accurate but increase the encoder complexity. This paper provides an innovative reduced com-plexity algorithm based on a ρ-domain rate model. Indeed, for each CTU, the algorithm predicts encoding parameters based on co-located CTU. By combining it with Laplacian distri-bution for transformed coefficients, we obtain the dead-zone boundary for quantization and the related quantization pa-rameter. Experiments in the HEVC HM Reference Software show a good accuracy with only a 3% average bitrate error and no PSNR deterioration for random-access configuration.

Mots clés: ρ-Domain; Rate-Control; HEVC

Domaines: Traitement du signal et de l'image [eess.SP]

Thibaud Biatek, Mickaël Raulet, J.-F Travers, Olivier Deforges. EFFICIENT QUANTIZATION PARAMETER ESTIMATION IN HEVC BASED ON ρ-DOMAIN. European Signal Processing Conference (EUSIPCO), Sep 2014, Lisbonne, Portugal. ⟨hal-01086050⟩