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Depth maps are becoming increasingly important in the context of emerging video coding and processing applications. Depth images represent the scene surface and are characterized by areas of smoothly varying grey levels separated by sharp edges at the position of object boundaries. To enable high quality view rendering at the receiver side, preservation of these characteristics is important. Lossless...
The HEVC standard brings large gains in coding efficiency, significant increase in computational effort and a new parallel encoding structure called tiles. Tiles can be used to greatly decrease encoding time through parallel processing at the cost of coding efficiency degradation. In multi-core systems running multiple tasks, the resources available to the HEVC application may not remain constant...
Error resilience (ER) is an important tool in video coding to maximize the quality of Experience (QoE). The prediction process in video coding became complex which yields an unsatisfying video quality when NALunit packets are lost in error-prone channels. There are different ER techniques and multiple description coding (MDC) is one of the promising technique for this problem. MDC is categorized into...
In this work, three encryption techniques are proposed by manipulating the bin (binary symbol) of significant values, transform skip signals and suffixes in selected CTU (coding tree unit) of video slices under the HEVC standard. These techniques are applied with minimal parsing overhead during encoding and decoding processes. Experiment results show that the selected region can be sufficiently encrypted.
Many fast integer-pixel motion estimation algorithms have been developed for the High Efficiency Video Coding Standard, however the speed of sub-pixel motion estimation still has room for improvement. A fast sub-pixel motion estimation algorithm is proposed in this paper to speed up the sub-pixel search process. First, the proposed scheme skips sub-pixel search process in smooth prediction units....
In this paper, a perceptual video coding system is developed based on the newest coding standard-HEVC/H.265. We propote a local Just-Noticeable-Difference (JND) model, which simultaneously considers the contrast sensitivity model, luminance masking, temporal masking, residue-dependent adjustment, and the summation effect of quantization distortion to get the weighting of importance of human eye perception...
In a distributed video coding problem, use of a correct model for the correlation noise plays a significant role in improving the decoding performance and consequently in providing higher coding efficiency. In this work, we first study the predictive and additive correlation noise models at the DCT coefficient band level for transform-domain distributed video coding. Then, bounds on compression rates...
In this paper, a graphics processing unit (GPU) based sample adaptive offset (SAO) parameters decision scheme is proposed for High Efficiency Video Coding (HEVC). Then, in order to further improve the performance of SAO, a perceptual based optimization scheme is provided according to the adjustment of Lagrange multiplier aiming to improve the subjective performance of SAO. Experimental results demonstrate...
Perceptual video coding has the potential to provide the same visual quality at a lower bit-rate, compared with the traditional objective quality based scheme. Visual saliency represents the probability of human attention over frames, and it is used for allocating coding bits or controlling visual quality. In this paper, a HEVC compliant perceptual video coding scheme is proposed based on visual saliency...
Although HTTP-based video streaming can easily penetrate firewalls and profit from Web caches, the underlying TCP may introduce large delays in case of a sudden capacity loss. To avoid an interruption of the video stream in such cases we propose the Backward-Shifted Coding (BSC). Based on Scalable Video Coding (SVC), BSC adds a time-shifted layer of redundancy to the video stream such that future...
The increasing popularity of HD TV, the emergence of beyond-HD formats and higher quality and resolution mobile TV services is posing a severe challenge on today's broadcast networks. Next generation networks (e.g, DVB-T2, DVB-S2, etc.) and higher coding efficiency can provide a solution to this problem. High Efficiency Video Coding (HEVC) is the latest standard jointly released by the ITU-T Video...
Screen contents have various characteristics features different from the natural images captured by cameras. These characteristic features have important effects on the video coding performance of motion estimation approaches. In this work, we carry out performance comparison of some low bit-depth based motion estimation approaches and evaluate performance of methods based on the characteristic features...
In this information age, a efficient video encoding/decoding technology will help reducing information redundancy, delaying processing, enhancing the robustness, improving visual perception of quality, increasing the compression ratio, etc. At first, this article describes the history of video encoding/decoding standards development. Research on the key technologies of H.264 coding standard currently...
Due to the complex environment conditions, many surveillance videos are captured from cameras which are influenced by shaking more or less. This presents a significant challenge for background-modeling-based video coding since it is difficult to generate good background frames from such shaking videos. To solve this problem, this paper proposes a global motion compensation method using motion vectors...
The emerging ultra-HD video content and the latest generation video coding standards such as HEVC and AVS2 involve significant computational complexity increase. Aiming to reduce the complexity of IDCT process, a fast IDCT design for AVS2 is presented in this paper, which bases on skipping the calculations of zero coefficients. After statistical analysis, we design several patterns for transform blocks...
Nowadays, there are many kinds of technologies to provide multimedia TV content in different formats and picture quality. Three-dimensional (3D) video is one of the next generation TV services with specific features from the video image quality point of view. Naturally, efficient compression tools enabling significant bit rate reduction to ease 3D video distribution are an integral part of any practical...
The High Efficiency Video Coding (HEVC) standard roughly doubles the rate-distortion compression performance of its predecessor, H.264/AVC, at a cost of a high computational complexity. Moreover, intra sequences are commonly used at video editing or post-production, making it necessary a migration from H.264/AVC to HEVC. This paper aims to propose a fast intra transcoding algorithm from H.264/AVC...
The challenge to H.265/HEVC multiview video coding (MVC) is its extremely high computational complexity. This paper presents the development and implementation of a scalable massively parallel fast search algorithm to significantly reduce the computational cost of motion and disparity estimation over the current best available GPU full block matching and sub optimal CPU fast search algorithms by a...
A new video coding algorithm using 3D transform is introduced. The algorithm does not use motion compensation. Two novel parts of the algorithm are: (1) The 4-channel SCWP is used for the time-dimension transform, and (2) A novel run-length coding method is developed for coding the quantized transform coefficients. Principally, the complexity of the proposed transform video coding algorithm is of...
In previous work, the authors developed a modular no-reference framework that compresses FASTA files by applying a predict-and-residue method, as used in video coding. We extended this framework with support for Context-Adaptive Binary Arithmetic Coding (CABAC), while at the same time preserving random access functionality and offering support for the full IUB/IUPAC nucleic acid codes alphabet.
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