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视频信号无论从空域还是时域都有很强的相关性,因此传输视频信号除了加纠错码外,在接收端的错误隐藏技术对提高重构图像质量也是十分有效的。该文提出了一个支持错误隐藏技术的MPEG-2(movingpictureexpertgroup)视频解码器的设计方案,用该方案进行的仿真实验证明其是可行的。同时基于图像信号的相关性、光滑性及一致性的假设,分别对MPEG-2的I-帧、P-帧和B-帧图像提出了相应的错误隐藏技术。此外通过分析直流系数的错误结果后,提出了直流系数的错误隐藏方法。该文算法简单,适于实时处理,峰值信噪比PSNR比一般传统方法平均高出2～3dB。
The video signal has a strong correlation both in airspace and in the time domain. Therefore, the error concealment technology at the receiver end is very effective to improve the reconstructed image quality besides the error correction code added to the transmitted video signal. This paper presents a design scheme of MPEG-2 (Moving Picture Frame) video decoder that supports error concealment technology. The simulation experiment with this scheme proves that it is feasible. At the same time, based on the assumption of the correlation, smoothness and consistency of the image signal, the corresponding error concealment techniques are proposed respectively for I-frame, P-frame and B-frame images of MPEG-2. In addition, by analyzing the error result of DC coefficient, a method of error concealment of DC coefficient is proposed. The algorithm is simple and suitable for real-time processing. The PSNR of peak signal-to-noise ratio is 2 ~ 3dB higher than that of the traditional method.