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为了提高恶劣信道上视频传输的鲁棒性,提出了一种基于棋盘式分割插值的多描述视频编码算法,即将输入图像按照棋盘模式分割并插值形成两路相同分辨率的近似图像,并对这两路近似图像进行独立的运动预测、补偿和编码。使用这种编码算法,接收端可以在同时收到两路描述时得到相当好的重建图像质量,而在由于误码或丢包等使其中一路描述丢失或受损时也能得到可以接受的重建图像质量。此外,编解码器之间的不匹配可以通过对两路描述之间差信号的部分编码得以有效的控制。在双向通信应用中编码器还可以根据反馈信息来主动跟踪解码器的状态从而消除误差积累。由于充分利用了分块DCT编码所固有的块间相关性,该算法与同类算法相比具有更好的冗余率失真性能。模拟实验表明,该算法在保持较高压缩效率的前提下,具有很好的鲁棒性,在高误码信道上相对于传统的单描述视频编码可以得到更为稳定的重建图像质量,并且编解码器之间的不匹配和误差积累都得到了有效的控制。
In order to improve the robustness of video transmission over harsh channels, a multi-description video coding algorithm based on checkerboard interpolation is proposed. The input images are divided and interpolated according to checkerboard pattern to form two approximate images with the same resolution. Two-way approximation image for independent motion prediction, compensation and coding. Using this encoding algorithm, the receiving end can get a fairly good reconstructed image quality while receiving two descriptions at the same time, and can get an acceptable reconstruction even if one of the descriptions is lost or damaged due to bit error or packet loss Image Quality. In addition, mismatches between codecs can be effectively controlled by partial encoding of the difference signals between the two descriptions. In bi-directional communication applications, the encoder can also actively track the state of the decoder based on feedback information to eliminate error accumulation. Due to the full use of the block correlation inherent in the block DCT coding, the proposed algorithm has better redundancy rate distortion performance than similar algorithms. The simulation results show that the proposed algorithm has good robustness under the premise of keeping high compression efficiency and can obtain more stable reconstructed image quality in high error channel compared with traditional single description video coding. Decoder mismatch and error accumulation have been effectively controlled.