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When a user uploads audio files to a music streaming service, these files are subsequently re-encoded to lower bitrates to target different devices, e.g. low bitrate for mobile. To save time and bandwidth uploading files, some users encode their original files using a lossy codec. The metadata for these files cannot always be trusted as users might have encoded their files more than once. Determining...
Statistical redundancies have been the dominant target in the image/video compression standards. Perceptually, there exists further redundancies that can be removed to further enhance the compression efficiency. In this paper, we considered short term homogeneous patches that fall into the foveal vision as dynamic textures, for which a psychophysical test was used to estimate their amount of perceptual...
Over the past few years, adaptive bitrate streaming protocols, such as DASH, have risen to enhance the End-Users' experience towards video consumption over the Internet. Current methods perform a smoother playback (i.e., fewer re-buffering states) trading off with quality fluctuations due to the client-server link state. The proposed work goes a step further and introduces an innovative lightweight...
The explosive demand for live video streaming over wireless networks is constantly calling for innovations in both video coding and wireless communities. The state-of-the-art answer to this challenge are sliding-window-based Delay-Aware Fountain (DAF) codes, which combine the channel-adaptive feature in rateless coding and the delay-aware feature in video coding. However, a high computational cost...
Motion Estimation is most important part of almost all video coding standards such as H.262/MPEG-2, H.264/MPEG-4 and High Efficiency Video Coding (H.265/HEVC). The HEVC is latest video compression standard and has incorporated many improvements like bitrate reduction, increased coding efficiency and compression efficiency but at the cost of increased complexity. The complexity of H.265 is increased...
Intra picture coding using HEVC is very efficient and is applied to video as well as single image compression. However, the cost for this high compression efficiency is the complexity caused by the high number of 35 available coding modes. Existing methods for fast mode decision estimate the mode costs based on the prediction error samples. This paper proposes a smart method to exclude the 33 angular...
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...
Depth videos shall be efficiently compressed and transmitted to the client for view synthesis in Three-Dimensional (3D) video system. Since depth video may contain noise that reduce the coding efficiency, we propose a depth filtering algorithm for 3D depth coding, which exploits the Allowable Depth Distortion (ADD) in view synthesis and is able to improve the coding performance of the depth encoder...
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...
This paper investigates the performance of high rate IEEE 802.15.4 UWB PHY schemes. Evaluation takes place over office, residential and outdoor IEEE channel models via Monte-Carlo simulation. Special attention is given to the highest rate (27.24 Mbps) scheme that suffers from intersymbol interference (ISI) over NLOS outdoor and residential channels. Optimum bit-to-symbol mapping (OBM), ISI cancellation...
A new-generation digital set-top-box (STB), as a core device of smart home, will provide mobile devices various multimedia services. In this study, we propose a more accurate power consumption model for mobile devices that are receiving video streaming services under the MPEG-DASH framework. The proposed model considers the influence of the encoding parameters specified by the encoder and the CPU...
In conventional space shift keying (SSK) and generalized SSK (GSSK), the symbols are transmitted only by the active antennas indices, while the inactive antennas remain unexploited; this limits the spectral efficiency. In order to combat this limitation, we propose a direct-code for SSK (DC-SSK) modulation technique. In DC-SSK, the transmitter is allowed to use 0,1,…, Nt antennas for each symbol,...
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...
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...
The scalable video coding enables to compress video contents into a hierarchical layered representation, each layer depicts an enhanced version of the underlying layer. SHVC is the scalable extension of HEVC and enables spatial, SNR, color-gamut, codec and bitdepth scalability. It has been proved, in the MPEG investigations prior to the recent Call for Evidence, that SHVC can support SDR-to-HDR scalability...
The paper presents the joint proposal by Arris, Dolby and InterDigital as a response to the Call-for-Evidence of the High Dynamic Range and Wide Color Gamut (HDR/WCG) video compression in MPEG. The joint proposal introduces a set of new HDR coding technologies, including the IPT-PQ color space, the adaptive reshaping process, the color enhancement filters, and the adaptive transfer function. These...
High Efficiency Video Coding (HEVC) is an ongoing standard, which is an extension of H.264/AVC which is the latest coding standard. In HEVC encoder an exhaustive search method is employed to select the best mode for each macro block which consumes more encoding time. Rate and Distortion tradeoff attained for encoding each macroblock introduces more computation complexity. Although, HEVC has better...
In this work, we evaluate the performance of several lossless compression methods on binary images simulated by a statistical model. This work was motivated by our previous study on compression of regions-of-interest maps in hyperspectral images, where a biased run-length coding method was found to provide good compression on just a few binary images with most pixels being in the background. In order...
The block truncation coding (BTC) is a simple and important technique to compress the digital image data. In this paper, we introduce our image compression method utilizing quadtree decomposition. In order to reduce bit rate and blocking effect, we apply the error diffusion technique. Our extensive experimental results show that the proposed method obtains excellent performances in terms of quantitative...
The emergence of HEVC software implementations allows for several different encoding options. Unfortunately, there is no established method for selecting optimal encoding configurations. The current paper proposes the use of a multi-objective optimization framework for selecting optimal encodings that can be subsequently used for solving constrained optimization problems in quality, bitrate, and encoding...
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