A videoconferencing-oriented hybrid-domain H.264/SVC to H.264/AVC spatial transcoder

作者：Sun Lei^*; Liu Zhenyu; Ikenaga Takeshi

来源：13th Pacific-Rim Conference on Multimedia, PCM 2012, 2012-12-04 to 2012-12-06.

DOI：10.1007/978-3-642-34778-8_12

• Coding efficiency
• Computational costs
• Drift compensation
• Drift problem
• H.264/AVC
• H.264/SVC
• hybrid-domain
• Low-complexity
• Mode mapping
• Motion data
• Pixel domain
• Quantized transform coefficients
• Re-encoding
• Reference method
• Scalable video coding
• Spatial scalability
• Time reduction
• Transcoder
• Transcoding
• Transcoding techniques
• Transform domain

As an extension of H.264/AVC, Scalable Video Coding (SVC) provides the ability to adapt to heterogeneous requirements. However, transcoding between SVC and AVC becomes necessary due to the existence of legacy AVC-based systems. The straightforward full re-encoding method requires great computational cost, and fast SVC-to-AVC spatial transcoding techniques have not been thoroughly investigated yet. This paper proposes a low-complexity SVC-to-AVC spatial transcoder in hybrid domain (pixel domain & transform domain) with drift compensation. In the pixel-domain transcoding, a fast re-encoding method is proposed based on mode mapping and MV refinement. In the transform-domain transcoding, the quantized transform coefficients together with motion data are reused directly to avoid re-quantization loss. At last, the drift problem in proposed transcoder is solved. Simulation results show that proposed transcoder achieves averagely 96.4% time reduction compared with the full re-encoding method, and outperforms the reference methods in coding efficiency.

• 出版日期2012
• 单位清华大学