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[摘要]：Video quality suffers significant degradation when transmitted over error-prone channels. We propose a novel error-resilient coding scheme based on the H.264/advanced video coding (AVC) standard to tackle this challenge. Compared to the traditional schemes that often employ a single and fixed tool, both intra refresh and reference selection refresh tools are dynamically used. The refresh locations, modes, and reference distances are determined according to the channel's state, the bit rate, and the expected distortion. A refresh allocation optimization mechanism for temporal and spatial terms is further developed under the approach, and the information from the distortion calculations is utilized to save computation time. Results indicate that the proposed scheme outperforms traditional refresh schemes in a loss-rate-varying transmission environment, and improves both subjective and objective qualities. (C) 2010 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.3467462] |
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