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This paper presents a stereo video codec called 3D+F which has specifically been designed to meet the low complexity requirements imposed by mobile applications while trying to be competitive with the state-of-the-art coders, such as the multi view video coding (MVC) extension of the H.264/AVC standard, in terms of rate-distortion (RD). By exploiting the stereo geometry of stereoscopic image pairs...
We study the design of iterative receiver structures for a simple communication system, operating over an AWGN channel with unknown gain and unknown noise power. Based on a generic message passing framework, which contains Belief Propagation (BP), Variational Message Passing (VMP), and Expectation Maximization (EM) as special cases, we first rederive a non-Bayesian EM-based SNR estimator which has...
This paper investigates the effect of reducing the resolution of estimated depth maps that are used for inter-view motion and residual prediction in a multiview extension of HEVC. The investigated HEVC extension includes disparity compensated prediction similar to the MVC extension of H.264/AVC. For further increasing the coding efficiency, the obtained disparity vectors are used to estimate depth...
Estimation of degradation in transmission quality of radio communications by using pulse duration distribution (PDD) of electromagnetic (EM) disturbance is discussed in this paper. An existing estimation method using amplitude probability distribution (APD) also gives an relation with bit error rate (BER) at decoder input, however, it is difficult to apply the relation to BER at decoder output, because...
In this paper an algorithm for distributed data storage in large-scale sensor networks has been proposed. The main objective is to distribute the generated information throughout the network to increase its lifetime. At the same time it is desired that the original data can be recovered later by collecting the contents of a limited number of sensor nodes. In the scenario considered here the sensor...
We consider a problem of finding codes over alphabets whose size s is not equal to the size of any finite field. We adopted an approach when a linear block code is taken over some finite field GF(q) such that q > s. Then a subcode is being found such that all the codesymbols of all its codewords belong to a subset of GF(q) of size s. Upper and lower bounds on the cardinality of the subset subcode...
High order entropy coding has proved to be critical for improving the coding efficiency of conventional image/video coding. What role will it play in distributed video coding? This talk intends to shed some light on that.
This paper proposes a unidirectional encoder rate control (ERC) scheme in the interpolation based distributed video coding. As the encoder is complexity constrained, accurate estimation of number of bits to decode each bit plane is indeed difficult at the encoder. In case of under-estimation of the bits, correction of the errors in the decoded bit planes, by utilizing the available information, is...
Multi-Processor Systems-on-Chip (MPSoC) are going to be the leading hardware platform featured in embedded systems, if they aren't already. This article deals with the performance estimation problem on these systems. Its purpose is the validation of a performance estimation methodology, proposed by the LIP2 laboratory (Tunis Faculty of Sciences, Tunis, Tunisia). Using the SDF3 tool, we modeled (1)...
This paper describes a review of turbo coding with channel estimation for Single-input and Single output system in ultra-wide band (SISO-UWB) channel. The common decoding algorithms used in turbo codes are Bahl, Cocke, Jelinek and Raviv (BCJR) algorithm, Viterbi algorithm, and Soft Output Viterbi Algorithm (SOVA). In the application of channel estimation with turbo codes the techniques used are maximum...
This paper proposes a novel approach for noise-robust speech recognition which combines a missing-data (MD) derived spectral reconstruction technique and uncertainty decoding based on the weighted Viterbi algorithm (WVA). First, the noisy feature vectors are compensated by using a novel MD imputation technique based on the integration of truncated Gaussian pdfs. Although the proposed MD estimator...
Distributed Video Coding (DVC) in transform domains could yield significant coding gains over the pixel domain. While employing different coding modes in DVC, it is still difficult to fully compress the source data without increasing the complexity at the encoder side. In this paper, we first propose a particular Run-Length-Coding (RLC) coding mode to efficiently compress the continuous zero symbols...
In most parametric stereo audio coders, sets of spatial parameters are extracted from the audio channels in a time-frequency domain. In order to reduce the amount of data, the parameters plane is highly down-sampled, and transmitted together with a mono downmix. Then, in the decoding process, it is necessary to interpolate the upmix matrix computed from these parameters. Usually, this is done in the...
The paper proposes a new approach for evaluating the security levels of digital watermarking schemes, which is more in line with the formulation proposed in cryptography. We first exhibit the class of equivalent decoding keys. These are the keys allowing a reliable decoding of contents watermarked with the secret key. Then, we evaluate the probability that the adversary picks an equivalent key. The...
In this paper, the channel estimation problem at the relay node in TWRN is investigated. We propose a turbo receiver at the relay where it jointly combines a nonbinary decoder and an EM estimator. By passing soft value between the decoder and estimator in an iterative manner, our approach outperforms the method of separate decoding and estimation in terms of mean square error (MSE) and bit error rates...
This paper considers data rate limitations for mean square stabilization of uncertain discrete-time linear systems via finite-data-rate and lossy channels. For a plant having parametric uncertainties, a necessary condition and a sufficient condition are derived, represented by the data rate, the packet loss probability, uncertainty bounds on plant parameters, and the unstable eigenvalues of the plant...
Distributed Video Coding (DVC) is a relatively new video coding paradigm evolved for catering to emerging applications such as wireless video surveillance and streaming. DVC is not yet commercially deployed due to various challenges including necessity of feedback channel, unavailability of standardized complete coding method including chroma components handling, lower Rate Distortion (RD) performance...
In this paper, we propose a scheme for increasing the capacity of forward and/or return links of the Digital Video Broadcasting Return Channel via Satellite (DVB-RCS). The increase of the capacity is achieved by overloading a pre-existing channel with a controlled interfering channel using Raptor code such that the transmission and decoding of the interfering data stream does not have any effect on...
Belief propagation (BP) is a powerful algorithm to decode low- density parity check (LDPC) codes over additive white Gaussian noise (AWGN) channels. However, the traditional BP algorithm cannot adapt efficiently to the statistical change of SNR in an AWGN channel. This paper proposes an adaptive scheme that incorporates expectation propagation (EP) into the BP based LDPC decoding process. The proposed...
Wyner-Ziv video coding is a new paradigm for video compression, in which the prediction frames are possibly only available at the decoder. It exploits the redundancy between the source frame and the prediction frame at the decoder by utilizing their correlation information. However, such correlation information is difficult to estimate due to the absence of the prediction frame at the encoder and...
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