| Electrical & Electronic Engineering |
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| Perceptual importance analysis for H.264/AVC bit allocation |
| Gui-xu LIN, Shi-bao ZHENG |
| Institute of Image Comm. & Info. Processing, Dept. of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Shanghai Key Laboratory of Digital Media Processing and Transmissions, Shanghai Jiao Tong University, Shanghai 200240, China |
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Abstract The existing H.264/AVC rate control schemes rarely include the perceptual considerations. As a result, the improvements in visual quality are hardly comparable to those in peak signal-to-noise ratio (PSNR). In this paper, we propose a perceptual importance analysis scheme to accurately abstract the spatial and temporal perceptual characteristics of video contents. Then we perform bit allocation at macroblock (MB) level by adopting a perceptual mode decision scheme, which adaptively updates the Lagrangian multiplier for mode decision according to the perceptual importance of each MB. Simulation results show that the proposed scheme can efficiently reduce bit rates without visual quality degradation.
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Received: 01 July 2007
Published: 20 December 2007
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