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The emerging Long-Term-Evolution (LTE) network is widely used in video transmission and plays an important role in supporting different services with high data rates and strict quality requirements. In addition to the quantization induced encoder distortion, the network environment induced packet loss can also lead to great distortions during video transmission. The Quality of Experience (QoE) of...
This paper aims to observe how one can apply fixed and probabilistic constraints on information sources and to emphasize the benefits obtained from this process for learning systems. Constraints applied may be both fixed, that are initially established with rigorous formulation, and probabilistic, in which case the process becomes an adaptive one, using statistical properties of the input symbols...
Modern video applications on mobile devices use higher resolutions and frame rates in order to offer better visual quality. Therefore, the power consumption reduction of the decoder in the mobile device is more challenging. In this paper, the reference frames selection algorithm of HEVC encoder for power consumption reduction on the decoder side is proposed. In particular, the power consumption of...
Besides appearance information, the video contains temporal evolution, which represents an important and useful source of information about its content. Many video representation approaches are based on the motion information within the video. The common approach to extract the motion information is to compute the optical flow from the vertical and the horizontal temporal evolution of two consecutive...
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...
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.
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...
Long Term Evolution (LTE) has been standardized by the 3GPP consortium since 2008 in 3GPP Release 8, with 3GPP Release 12 being the latest iteration of LTE Advanced (LTE-A), which was finalized in March 2015. High Efficiency Video Coding (H.265) has been standardized by MPEG since 2012 and is the Video Compression technology targeted to deliver High-Definition (HD) and Ultra High-Definition (UHD)...
The multi-view video streaming is one of promising technologies for emerging video services. For those applications of multi-view video streaming, video frames of all viewpoints, i.e., cameras, are needed to be transmitted to viewers because the demands of all the viewers' view-switching are unpredictable. However, existing transmission schemes are highly vulnerable to frame loss. Specifically, the...
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...
The rapid advancements in networking technologies and hand-held devices enable mobile users to concurrently receive real-time multimedia streaming (e.g., high-definition video) with different radio interfaces (e.g., Wi-Fi and LTE networks). Stream control transmission protocol (SCTP) is an important transport-layer solution to implement concurrent multipath transfer (CMT) over heterogeneous wireless...
End-users in online video services are sensitive to the overall quality of the video at screen, but also, and more importantly, to other factors, including the latency between the video generation and the playback for live videos. If the improvement of the quality of the perceived video has been well investigated by the multimedia community, the impact of delay, latency, and re-buffering has not received...
One of the main challenges for continued wireless capacity growth is the difficulty in exploiting the multicast nature of the wireless medium: wireless end points rarely experience the same channel conditions or access the same content at the same time. In this paper, we present and analyze a novel wireless video delivery paradigm based on the combined use of channel-aware caching and coded multicasting...
Three-dimensional (3D) images and video have been around for decades in a variety of formats and supported by different technologies. In the recent past, these technologies have been given increasing attention from both academia and industry mainly due to advances in capture, coding, transmission and display technologies. 3D video has evolved from stereoscopic towards multi-view video plus depth,...
Nowadays, multiview video, as an advanced form of educational video, is in development phase. In this article, positive and problematic aspects of educational video are described from the point of view of a teacher. The technical properties and problems of multiview video streaming, such as Multiview Video Coding (MVC), streaming technology, and multiview video database systems are briefly mentioned...
HEVC (H.265) standard is the latest enhanced video coding standard which was planned to improve the rendered specifications of its preceding standard MPEG-4 (H.264). The main goal of the HEVC standardization effort is to enable significantly improved compression performance relative to existing standard H.264. For similar video quality, HEVC bitstreams consume only about half of the bitrate compare...
An efficient framework of distributed compressive video coding using Enhanced side information for WSN is proposed. At the encoder, the incoming video frames are split into key frames and Wiener-Ziv (WZ) frames depending on Group of Picture (GOP). Based on Distributed Video Coding (DVC) these frames are processed independently and transmitted over WSN. Generally the WZ frames are encoded at a lower...
Perceptual video coding with rate control is a technique commonly used to improve the perceptual video quality without compromising on the video bit rate. Region of Interest (ROI) detection has traditionally been done by a dedicated software or hardware block which provides the video encoder the coordinates of the regions whose perceptual video quality needs to be higher than non-ROI regions. This...
Many popular video coding standards such as VPx, H.26x achieve video compression by using spatial and temporal dependencies in the source video signal. This makes the encoded bitstream vulnerable to errors during transmission. In this paper, we investigate an error resilient video coding for the VPx bitstreams using error resilience packets. An error resilient packet consists of encoded keyframe contents...
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