Kim C S, Kim R C, Lee S U
Sch. of Electr. Eng., Seoul Nat. Univ., Seoul, Korea.
IEEE Trans Image Process. 2000;9(2):209-19. doi: 10.1109/83.821732.
The motion compensation-discrete cosine transform (MC-DCT) coding is an efficient compression technique for a digital video sequence. However, the compressed video signal is vulnerable to transmission errors over noisy channels. In this paper, we propose a robust video transmission algorithm, which protects the compressed video signal by inserting redundant information at the source level. The proposed algorithm encodes every lth frame in the semi-intra frame (S-frame) mode, in which the redundant parity-check DC coefficients (PDCs) are systematically inserted into the compressed bitstream. Then, the decoder is capable of recovering very severe transmission errors, such as loss of an entire frame, in addition to detecting the errors effectively without requesting any information from external devices. The proposed algorithm is implemented based on the H.263 coder, and tested intensively in realistic error prone environment. It is shown that the proposed algorithm provides much better objective and subjective performances than the conventional H.263 coder in the error prone environment.
运动补偿离散余弦变换（MC-DCT）编码是一种用于数字视频序列的高效压缩技术。然而，压缩后的视频信号在有噪声的信道上传输时容易受到传输错误的影响。在本文中，我们提出了一种鲁棒的视频传输算法，该算法通过在源级别插入冗余信息来保护压缩后的视频信号。所提出的算法以半帧内（S帧）模式对每第l帧进行编码，其中冗余的奇偶校验直流系数（PDC）被系统地插入到压缩比特流中。然后，解码器除了能够有效地检测错误而无需从外部设备请求任何信息外，还能够恢复非常严重的传输错误，例如整个帧的丢失。所提出的算法基于H.263编码器实现，并在实际易出错环境中进行了大量测试。结果表明，在所提出的算法在易出错环境中比传统的H.263编码器提供了更好的客观和主观性能。
