Applications of distributed source coding to error resiliency of pre-encoded video

This paper presents an extension to video error resiliency based on distributed source coding. The paper proposes a frequency domain transcoder and a compressed domain transcoder for boosting the error resiliency of pre-encoded video using distributed source coding techniques. In both transcoders it is proposed to identify regions of interest in the pre-encoded video. In the compressed domain transcoder, the regions of interests are retained as is, whilst in the frequency domain transcoder, such regions are reproduced at a lower fidelity by requantization or ideal low pass filtering. Channel coding follows, and the parity bits are transmitted in an error resiliency supplementary bitstream. At the destination, the paper proposes a pre-decoding solution that regenerates the low fidelity ROIs and corrects the received bit stream using the aforementioned supplementary stream. The corrected bitstream is then repacked and sent to the destination decoder. In comparison with traditional FEC techniques, experimental results show robust resiliency against packet losses up to a loss ratio of 15%.