Bidirectionally decodable Wyner-Ziv video coding
Inter frame prediction technique significantly improves the compression efficiency in the hybrid video coding schemes. However, this technique causes the decoding dependency of each inter frame on all of its reference frames. This dependency complicates the reverse play operation which is the most common video cassette recording (VCR) functions. This dependency also causes error propagation when the video is transmitted over error prone channel. In this paper, we propose a novel bidirectionally decodable Wyner-Ziv video coding scheme which relaxes this inter frame dependency. The proposed bidirectionally decodable Wyner-Ziv frame can be decoded by using whether forward prediction or backward prediction as side information at the decoder, i.e. the proposed stream supports forward decoding and backward decoding simultaneously. Compared with the other schemes which support reverse playback, our scheme requires much lower bandwidth and smaller storage space. In error resilient test, our scheme outperforms H.264 up to 4dB at same bitrate. Our proposed frames also support video splicing and stream switching at arbitrary time point like I-frames.