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Most recently, the low density parity check codes are chosen as the channel encoding method to encode the Wyner-Ziv frames in distributed video coding. These codes involve much complicated encoding and decoding algorithms, and might increase the processing time of the system. In this paper, we use the codes with simpler encoding and decoding algorithms, the Reed Solomon codes, and compare the performance...
The rate-distortion performance of a distributed video coding system strongly depends on the characteristics of the side information. One could naïvely think that the best side information is the one with the largest PSNR with respect to the original corresponding image. However, previous works have shown that this is not always the case and a reduction of the side information MSE does not always...
In the new Wyner-Ziv (WZ) video coding paradigm, a virtual correlation channel is assumed between the quantized source and the side information (SI) at the decoder, and channel coding is generally applied to achieve compression. In this paper, we address errors caused by the virtual correlation channel and propose an error concealment approach for pixel-based WZ video coding. In the approach, errors...
Multiple description coding (MDC) provides stable wireless multimedia communications with the help of multiple transmission paths, while distributed video coding (DVC) effectively shifts the encoder complexity to decoder for mobile media devices. We proposed to combine MDC with DVC, abbreviated as MDVC, to construct a reliable and efficient video codec system. To improve the codec performance, the...
This paper concerns the issue of side information generation for distributed video coding (DVC). A new side information construction algorithm based on block interpolation is proposed. In this method, we firstly perform block classification to obtain the parameters of the motion estimation, avoiding the full search. Then forward and backward motion estimation is executed to find an initial motion...
In Wyner-Ziv video coding (WZVC) (a special form of distributed video coding) the heavy work of motion estimation is shifted to the decoder. Unlike conventional video systems, such a scheme allowed for new emerging technologies that require low-complexity encoders. A key factor to the performance of WZVC is the quality of the side information (SI) present at the decoder which heavily depends on the...
This work aims at improving the quality of the side information in distributed video coding. Based on genetic algorithms, our proposed technique combines several frames, interpolated using previously developed methods, in a fusion-based approach. Simulation results show a significant improvement in the side information quality compared to other interpolation techniques available in the literature,...
This paper proposes a multiple description coding scheme based on a multi-loop structure, which prevents drift distortion accumulation in intra predicted slices. The drift is compensated by generating a controlled amount of side information used by the decoder whenever any description is lost in the corresponding network path. The experimental results show that intra predicted slices do not suffer...
In this paper, we propose a skip decision method based on the linearity of motion in Wyner-Ziv coding structure. By comparing motion vectors of theside information with respect to each key frame, decoder evaluates quality of side information. When motion in side information is estimated as linear, a good quality of side information is expected, therefore we send the skip indication to encoder and...
Distributed video coding (DVC) is a recent paradigm which aims at transferring part of the coding complexity from the encoder to the decoder. The performance of such a coding scheme strongly depends on the capacity to estimate correlation at the decoder and, consequently, on the side information quality. In this paper we consider a multi-view DVC framework and propose a very efficient dense disparity...
Wyner-Ziv (WZ) video coding, or lossy coding of video with decoder side information (SI), is a new video coding paradigm which provides the potential of shifting encoder complexity to decoder. Due to the fact that correlation among adjacent frames varies spatially and temporally in a video sequence, in WZ video coding, the quality of SI generated at the decoder also varies accordingly. This implies...
Distributed video coding (DVC) is a new paradigm based on the slepian-wolf and Wyner-Ziv theorems where the temporal redundancy is mainly exploited at the decoder and not anymore at the encoder as in conventional predictive video coding. One of the most popular Wyner-Ziv video coding architectures, the stanford architecture, splits the video frames into two types of frames: key frames and Wyner-Ziv...
We address the hash-based side information generation problem in Distributed Video Coding (DVC). The side information plays an important role in DVC because more accurate side information is generated with less number of parity bits needed to successfully decode the Wyner-Ziv (WZ) frame. In hash-based side information generation, the encoder also generates and transmits some hash codes about the current...
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