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Abstract:

Abstract—Transmission of video over wireless and mobile networks requires a scalable solution that is capable of adapting to the varying channel conditions in real-time (bit-rate scalability). Furthermore, video content needs to be coded in a scalable fashion to match the capabilities of a variety of devices (complexity scalability). These two properties—bit rate and complexity scalability—provide the flexibility that is necessary to satisfy the “Anywhere, Anytime, and Anyone ” network paradigm of wireless systems. Meanwhile, MPEG-4 fine-granular-scalability (FGS) has been introduced as a flexible low-complexity solution for video streaming over heterogeneous networks (e.g., the Internet and wireless networks). FGS is also highly resilient to packet losses. However, the flexibility and packet-loss resilience associated with the FGS framework come at the expense of decreased coding efficiency compared with nonscalable coding. In this paper, a novel scalable video-coding framework and corresponding compression methods for wireless video streaming is introduced. Building on the FGS approach, the proposed framework, which we refer to as adaptive motion-compensation FGS (AMC-FGS), provides improved video quality of up to 2 dB. Furthermore, the new scalability structures provide the FGS framework with the flexibility to provide tradeoffs between resilience, higher coding efficiency and terminal complexity for more efficient wireless transmission. Index Terms—Bit-rate scalability, complexity scalability, FGS, scalable video, universal multimedia access, wireless video.

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