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In this paper we propose a distributed video combining method applicable to continuous presence multipoint video conferencing for the H.264 coding standard. The proposed method takes advantage of the significant coding features of the H.264 format and employs star-connected multiple video combiners to perform combining process cooperatively. We investigate the architecture and the required operations...
No-reference video quality monitoring algorithms typically assume the availability of the encoded bitstream in order to assess the quality of the received signal at the decoder side. In some situations this is not possible, e.g. because the bitstream is encrypted or processed by third party decoders. Thus no-reference quality monitoring must be carried out in a blind way, i.e. using only pixel-domain...
We investigate retransmission-based robust video streaming over lossy packet networks in this paper. We propose to send a thumbnail video along with the video packets. The thumbnail video is Wyner-Ziv-coded to exploit its correlation with the primary video. The receiver decodes the primary video with the help of error concealment to mitigate packet losses. Upon receiving and successfully decoding...
A new error concealment algorithm is proposed as a post-processing tool at the decoder side for recovering the lost blocks and their motion vectors as well incurred during the video transmission. Sobel operator is used to detect the edge of the blocks around the lost block and find the more precise estimation of the motion vectors by all edge blocks. Simulation results show that the proposed method...
Video transmission over noisy channels, like wireless channels, leads to errors on video. Effect of information loss is worse in case of transmission of compressed video. With growing interest in compressed video transmission over such environments, error concealment is becoming more important. In this paper we describe error concealment scheme which uses weighted pixel averaging to obtain each pixel...
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