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SSIM-Motivated Two-Pass VBR Coding for HEVC.
- Source :
-
IEEE Transactions on Circuits & Systems for Video Technology . Oct2017, Vol. 27 Issue 10, p2189-2203. 15p. - Publication Year :
- 2017
-
Abstract
- We propose a structural similarity (SSIM)-motivated two-pass variable bit rate control algorithm for High Efficiency Video Coding. Given a bit rate budget, the available bits are optimally allocated at group of pictures (GoP), frame, and coding unit (CU) levels by hierarchically constructing a perceptually uniform space with an SSIM-inspired divisive normalization mechanism. The Lagrange multiplier $\lambda$ , which controls the tradeoff between perceptual distortion and bit rate, is adopted as the GoP level complexity measure. To derive $\lambda$ , Laplacian distribution-based rate and perceptual distortion models are established after the first pass encoding, and the target bits are dynamically allocated by maintaining a uniform Lagrange multiplier level for each GoP through $\lambda$ equalization. Within each GoP, rate control is further performed at frame and CU levels based on SSIM-inspired divisive normalization, aiming to transform the prediction residuals into a perceptually uniform space. Experiments show that the proposed scheme achieves high accuracy rate control and superior rate-SSIM performance, which is further verified by subjective visual testing. [ABSTRACT FROM PUBLISHER]
Details
- Language :
- English
- ISSN :
- 10518215
- Volume :
- 27
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Circuits & Systems for Video Technology
- Publication Type :
- Academic Journal
- Accession number :
- 125562410
- Full Text :
- https://doi.org/10.1109/TCSVT.2016.2580398