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H.264/AVC is a high performance video coding standard with higher compression and better network compatibility, which not only has important theoretical value but also shows wild application prospect. In order to reduce its computational complexity and achieve real-time application requirements, a multi-stage fast intra mode decision algorithm is proposed. In the first stage, we choose the optimal...
H.264 motion estimation achieves better compression efficiency of video coding than previous video standards (e.g. MPEG-2, H.263, and JPEG). But it leads to higher computational cost and complexity in coding. In this study we propose an efficient early termination searching method to reduce the computational complexity and achieve better compression ratio. Adaptive search strategy is applied to reduce...
In this work, we propose a simple but effective mesh-pull-based P2P video streaming system using Fountain codes with variable symbol sizes for video-on-demand services. The goal of the proposed system is to provide a stable video streaming service of high quality with a low computational complexity and short initial latency. Fountain codes are adopted in the proposed system to simplify the handshaking...
We worked toward development of a low bit-rate encoding algorithm and a low-complexity encoding algorithm for G.718/G.718-SWB, a new standard of International Telecommunication Union - Telecommunication Standardization Sector (ITU-T). Many key technologies including Band-Selective Shape-Gain Coding (BS-SGC) were developed for the standard. BS-SGC can encode the audio signal efficiently at a low bit-rate...
RAID-6 is widely used to tolerate concurrent failures of any two disks to provide a higher level of reliability with the support of erasure codes. Among many implementations, one class of codes called {\bfseries{M}}aximum {\bfseries{D}}istance {\bfseries{S}}eparable ({\bfseries{MDS}}) codes aims to offer data protection against disk failures with optimal storage efficiency. Typical MDS codes contain...
In this paper, a quantization scheme based on hard-decision partition and adaptive reconstruction levels is proposed for High Efficiency Video Coding (HEVC), the video coding standard currently under development, which has demonstrated approximately 40% bit saving compared to H.264/AVC. For each video frame, the residual signal after motion estimation is transformed and then quantized by a hard-decision...
We study efficient algorithms for soft-input soft-output (SISO) encoding of convolutional codes. While the BCJR algorithm has been suggested for SISO encoding, we show that a forward recursion on the code's trellis is sufficient to compute the a posteriori probabilities of the code bits. We further propose a shift-register based SISO encoding algorithm for non-recursive convolutional encoders, whose...
This work discusses a fast generation procedure of authentication codes, for multimedia content cryptography, whose length (and computational complexity) can be tuned accordingly to the specific mobile application and service. In this work, we propose a digital algorithm to generate a pair of long (asymmetric) keys from one short primitive key. According to our results, the devised procedure provides...
The recentH.264/AVCvideo coding standard provides a higher coding efficiency than previous standards. H.264/AVCachieves a bit rate saving of more than 50 % with many new technologies, but it shows very heavy computational complexity. In this paper, a fast mode decision scheme for inter-frame coding is proposed to reduce the computational complexity for H.264/AVC video encoding system. To reduce the...
We propose a new algorithm based on PEG algorithm to construct high-girth quasi-cyclic low-density parity check (QC-LDPC) codes. Before our improved algorithm in introduction, we depict the general algorithm based on PEG algorithm to construct QC - LDPC code, if necessary to eliminate the short cycles, that would bring in cycles-search. When code length of basic matrix is not too long, the algorithm...
Problems involving network design can be found in many real world applications such as power systems, vehicle routing, telecommunication networks, phylogenetic trees, among others. These problems involve thousands or millions of input variables and often need information and solution in real time. In general, they are computationally complex (NP-Hard). In this context, metaheuristics like evolutionary...
Fine Granular Scalable (FGS) video coding is a key technology in MPEG-4 streaming video profile. With the Internet developing rapidly, it comes into being and adapts magnificently to Internet's highly heterogeneity, providing with favorable robustness. However, FGS coding efficiency is low, which brings some Improving Algorithms of FGS. Progressive Fine Granular Scalable (PFGS) Coding is the significant...
Identification of protein coding regions (exons) in eukaryotic genomic sequences is an active area of research at present. Mapping of symbolic genomic sequences to numeric sequences is the first step required for processing them using digital signal processing (DSP) tools. For DFT-based methods paired numeric and frequency of nucleotide are reported as the best mapping schemes. In this work performance...
Summary form only given. In this paper, we propose an optimized in painting-based macro block(MB) prediction mode (IP-mode) in the state-of-the-art H.264/AVC video compression engine, and belief propagation (BP) is applied to achieve the global spatio-temporal consistency between the predicted content and the co-located known region. To decrease the computing complexity of the iterative BP algorithm,...
Summary form only given. In this paper, Wyner-Ziv (WZ) video coding is a particular case of distributed video coding (DVC). Although some works, with improved performance, have been made in recent years, the coding efficiency of state-of-the-art WZ codec is still far from that of the state-of-the-art prediction-based codec, especially for high and complex motion contents. Moreover, most reported WZ...
To the condition of the complexity of AVS-M transforming quantization all-zero block detection algorithm changes with video content changes, according to the characteristics of adjacent video frame contents have dependence, a adaptive complexity control algorithm for AVSM transforming quantization is proposed. According to reasonable parameter choice, the algorithm can converge to the given computational...
Nowadays, it is possible to optimize the storage size of large files in distributed environments, maintaining the same availability level in the system. Although replication (backups) is the most used option, it is possible to make use of erasure coding in order to significantly compress the storage size [1]. However, using erasure coding, more information needs to be transmitted than when using replication,...
We propose a new way to construct a multicast coding scheme for linear deterministic relay networks. Our construction can be regarded as a generalization of the well-known multicast network coding scheme of Jaggi et al. to linear deterministic relay networks and is based on the notion of flow for a unicast session that was introduced by the authors in earlier work. We present randomized and deterministic...
Well-formed parenthesis (w.f.p.) strings can be represented by different types of integer sequences including P-sequences, X-sequences, and T-sequences. In this paper, we introduce a new class of sequences called L-sequences which comes from the so-called RD-sequences for representing k-ary trees. We then search out the relationships among these representations and deal with the problems of ranking...
In this paper, we propose a full hardware encoder architecture for context-based adaptive binary arithmetic coding (CABAC) for Super Hi-vision data that tries to enlarge the throughput of the encoder. CABAC is a crucial part in H.264/AVC main profile that provides a great compression ratio at the expense of high computational complexity. Due to the data dependence between bit-wise processing, the...
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