Standard video coders utilize variablelengthcoding (VLC) to obtain more data compression in addition to what lossy coding has achieved at the expense of making the compressed bitstream very vulnerable to channel err...
详细信息
Standard video coders utilize variablelengthcoding (VLC) to obtain more data compression in addition to what lossy coding has achieved at the expense of making the compressed bitstream very vulnerable to channel errors. Even a 1-bit error incurred in the bitstream may cause the follow-up bitstream to be either erroneously decoded or completely undecodable, and this could further result in error propagation. To mitigate this phenomenon, a new VLC coding scheme is proposed in this paper, called the two-way decodable variablelength data block (TDVLDB), which allows the compressed bitstream to be bidirectionally decodable without exploiting data partitioning. The proposed TDVLDB scheme is able to effectively recover more uncorrupted data from the corrupted packets. Furthermore, it is able to correct some, if not all, channel errors of a finite-length burst error. To effectively identify the location of the first actual error incurred within the current slice, a bitstream similarity measurement (BSM) algorithm is proposed. Note that the proposed TDVLDB scheme is generic in the sense that it can be exploited in any image or video coding framework as long as it involves the use of VLC and requires error-resilience capability. In this paper, the proposed TDVLDB is incorporated into the H.264/advanced video coding (AVC) coder to evaluate its error-resilience performance in terms of rate-distortion coding efficiency. Compared with the baseline H.264/AVC coding, the TDVLDB-incorporated H.264/AVC-based coding scheme has demonstrated significant objective and subjective video quality improvements when the bitstream is transmitted over error-prone channels.
A new general scheme is introduced that allows bidirectional decoding of variablelength coded bitstreams from either end. Except for a small fixed number of extra bits appended to a sequence of code words, the scheme...
详细信息
A new general scheme is introduced that allows bidirectional decoding of variablelength coded bitstreams from either end. Except for a small fixed number of extra bits appended to a sequence of code words, the scheme is as efficient as Huffman coding. The extra operations required at coder and decoder are code word reversal and one EXOR for each bit.
Error resilience techniques have already become an important part of video coding over error-prone *** this paper,we present an error resilient codec which based on H.263 data partitioned slice *** employs several err...
详细信息
ISBN:
(纸本)0780363949
Error resilience techniques have already become an important part of video coding over error-prone *** this paper,we present an error resilient codec which based on H.263 data partitioned slice *** employs several error resilient techniques including data partitioning,reversible variable length coding and error concealment *** order to check out the error resilience performances of the codec,we use error patterns to simulate WCDMA *** simulations are conducted on H.263 sequences at 64, 128 and 384 *** results show that the error resilience algorithms applied by the codec is *** the subjective and the objective quality of the reconstructed image get a remarkable improvement.
暂无评论