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The emergence of the new standard HEVC (High Efficiency Video Coding) is accompanied with serious problems related to resource consumption and encoding time. The proposal of new tools and optimizations is strongly recommended to ensure the integration of this new encoder in various platforms and multimedia applications. In this context, Kvazaar HEVC encoder is introduced to overcome the problems related...
The video coding standard, H.264/MPEG-4 AVC, uses variable block sizes in intra coding. This feature has achieved significant coding gain compared to coding a macroblock (MB) using fixed block size. However, this feature results in extremely high computational complexity when brute force rate distortion optimization (RDO) algorithm is used. In this paper, we propose an Efficient Intra Block Size Decision...
Weighted prediction (WP) is an efficient tool for encoding of video with brightness variations, if WP parameters can be estimated accurately. In this paper, an improved estimation method for WP parameters of advanced video coding system (AVS) is proposed. To find a best matching block in reference for current block to be encoded, a motion search scheme is presented. Each block in a searching window...
One of the challenges in video rate control lies in accurately achieving the target bitrate by determining coding parameter set. In HEVC, nontexture bits become more significantly important, due to the adoption of more coding tools compared to H.264 standards. In this paper, we propose an accurate rate model to estimate the size of nontexture bits accurately. In addition, parameter update conditions...
New and modern video encoders employ the CABAC (Context-Based Adaptive Binary Arithmetic Coding) to allow a high compression and/or improved video quality. CABAC is composed of three main blocks which are binarizer, context modeler and binary arithmetic coder block. Since the binarizer block is used in the beginning of the encoder process, the whole performance of CABAC depends a lot on the design...
Scalable extension (SHVC) of the High Efficiency Video Coding HEVC was developed to ameliorate the coding efficiency for different types of scalability. In this paper, a survey for SHVC extensions is investigated. We describe its scalability types and explain the different additional coding features that further improve the Enhancement Layer (EL) coding efficiency. Furthermore, we evaluate and prove...
High Efficiency Video Coding (HEVC) standard represents the newest video coding standard generation for both ITU-T Video Coding Experts Group and the ISO/IEC Moving Picture Experts Group. The new standard reduces bitrates by 50% compared to the existing standards using Advanced Video Coding (AVC) for equal video quality. This paper provides an overview of the technical features and characteristics...
In this paper, an efficient quantization parameter (QP) assignment method is proposed for MPEG internet video coding (IVC). QP is one critical control point in video compression performance. Instead of assigning the same QP value for each frame, the allocation of different QP values can increase the coding efficiency of standardized video codecs such as AVC/H.264 and HEVC along with the special group...
High Dynamic Range (HDR) videos are commonly compressed using existing Low Dynamic Range (LDR) coding standards. This necessarily implies a Tone Mapping (TM) stage which aims at reducing the input video range while preserving the most significant scene details. In most cases, a residual sequence is encoded and used at the decoder side to recover the HDR content. The challenge is to efficiently encode...
Green computing and energy efficiency has become an important issue in today's rapidly growing multimedia transmission. Meanwhile users want high-quality content to be viewed anywhere, content producers must think alternatives for cutting expenses in the server. Usually multiple sub-streams from the original video feed are needed for clients with unique device characteristics, which can notably load...
Distributed video coding is the promising solution for emerging applications such as wireless video surveillance, wireless video sensor networks that have not been supported by traditional video coding standards. Success of distributed video coding is based on exploiting the source statistics at the decoder with availability of some side information. The better the quality of side information, the...
The 3D High Efficiency Video Coding (3D-HEVC) is the latest 3D extension of the HEVC video coding standard. It supports multi-view videos plus depth (MVD), which is a sophisticated format for enhanced 3D content. Depth modeling modes (DMM) are adopted in the 3D-HEVC for better sharp edge encoding. However, employing DMM causes important computational complexity. In this paper, we propose a new method...
Based on analog joint source-channel coding (JSCC) scheme, SoftCast approach can gracefully avoid the cliff effect. And SoftCast is outperformed by the DCast scheme which combines JSCC scheme with distributed source coding (DSC) theory. Considering the disproportionate distribution of frequency coefficients, we propose an optimized power allocation SoftCast (OPA-SoftCast) scheme which has a significant...
The ever increasing number of video uploads in social media platforms, together with the incorporation of live video broadcasts and a growing demand for higher video resolution, will likely pose the most significant performance challenge for social media providers in the years to come. The current state of the art in most social media platforms, involves videos in H.264/AVC format. However, recent...
Although High Dynamic Range (HDR) content can provide an enhanced immersive experience for end-users, the impact of channel errors on its perception is unclear due to the lack of a standardized HDR video distribution framework. This paper presents an assessment of the robustness of the two main HDR video distribution architectures, the single-layer 10-bit scheme and the two-layer 8-bit backward-compatible...
The High Efficiency Video Coding (HEVC) standard enables meeting new video quality demands such as Ultra High Definition (UHD). Its scalable extension (SHVC) allows encoding simultaneously different representations of a video, organised in layers. Thanks to inter-layer predictions, SHVC provides bit-rate savings compared to the equivalent HEVC simulcast encoding. Therefore, SHVC seems a promising...
The High Efficiency Video Coding (HEVC) standard provides up to 40% bitrate savings compared to the state-of-art H.264/AVC standard for the same perceptual video quality. Power consumption constraints represent a serious challenge for embedded applications based on a software design. A large number of systems are likely to integrate the HEVC codec in the long run and will need to be energy aware....
Scalable video coding offers a large choice of configurations when decoding a compressed video. A single encoded bitstream can be decoded in multiple modes, from a full video quality mode to different degraded video quality modes. In the bitstream, data is separated into layers, each layer containing the information relative to a quality level and depending on information from other layers. In the...
Phase Congruency (PC) features are firstly introduced into image and video coding field in this paper. As an effective tool to measure the edge information for image textures, PC change can be used to evaluate the compression loss, i.e. the coding distortions in image and video coding. Firstly, the compression influences on PC maps are given and analyzed. Secondly, the relationship between the consumed...
We propose an end-to-end approach to describe the energy usage of video delivery within a content delivery framework, and use this to investigate the energy usage behavior of two popular coding schemes, namely, H.264/AVC and H.265/HEVC. Our study based on the proposed model is backed up by measurements of encoding and decoding energy usage of a sample video and shows that, from an end-to-end perspective,...
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