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Author: Publisher: ISBN: Category : Dissertations, Academic Languages : en Pages : 73
Book Description
There is an increased awareness on security everywhere and the use of wireless internet technologies for security and surveillance applications is increasing. The Surveillance applications vary from monitoring super markets to large coast line harbors and so on. The solutions currently available in the market are proprietary, expensive and very hard to deploy. The objective of this project is to overcome this complexity and to come up with a simple and scalable solution to stream video wirelessly using open source software and easily available devices. The recent trend in multimedia computing applications requires increasing bandwidth and computing power. As an integral part of multimedia computing, the efficiency of digital video processing is a very compelling issue. This research focuses on an efficient way to wirelessly stream video from any Standard video4linux compatible USB Web Camera which can be scaled to high-end surveillance cameras as well to a mobile user. All communication between the mobile user and the web camera will be performed using a web browser. A real-time video stream will be efficiently encoded and transmitted from the web camera over an 802.11 WLAN and displayed in a mobile user's browser. In this project the end users will be able to remotely view the live video stream using any standard web browser running on any device with a wired or wireless interface. We have proposed a novel video encoding scheme to efficiently transmit video frames to a remote browser. Based on link quality and signal strength, the web camera will adaptively modify the number of frames transmitted per second and the quality of a transmitted frame to reduce packet loss and efficiently saving bandwidth and present the end user with a glitch free video. Based on the available bit rate information and the pre-determined data model the rate-adaptation module uses 'Newton Raphson' method to determine the encoding parameters. The research also includes understanding of various video compression techniques and Real time video streaming methods. Understanding of some open source libraries such as FFmpeg, MPEG4IP and Live555 are also a part of the research.
Author: Publisher: ISBN: Category : Dissertations, Academic Languages : en Pages : 73
Book Description
There is an increased awareness on security everywhere and the use of wireless internet technologies for security and surveillance applications is increasing. The Surveillance applications vary from monitoring super markets to large coast line harbors and so on. The solutions currently available in the market are proprietary, expensive and very hard to deploy. The objective of this project is to overcome this complexity and to come up with a simple and scalable solution to stream video wirelessly using open source software and easily available devices. The recent trend in multimedia computing applications requires increasing bandwidth and computing power. As an integral part of multimedia computing, the efficiency of digital video processing is a very compelling issue. This research focuses on an efficient way to wirelessly stream video from any Standard video4linux compatible USB Web Camera which can be scaled to high-end surveillance cameras as well to a mobile user. All communication between the mobile user and the web camera will be performed using a web browser. A real-time video stream will be efficiently encoded and transmitted from the web camera over an 802.11 WLAN and displayed in a mobile user's browser. In this project the end users will be able to remotely view the live video stream using any standard web browser running on any device with a wired or wireless interface. We have proposed a novel video encoding scheme to efficiently transmit video frames to a remote browser. Based on link quality and signal strength, the web camera will adaptively modify the number of frames transmitted per second and the quality of a transmitted frame to reduce packet loss and efficiently saving bandwidth and present the end user with a glitch free video. Based on the available bit rate information and the pre-determined data model the rate-adaptation module uses 'Newton Raphson' method to determine the encoding parameters. The research also includes understanding of various video compression techniques and Real time video streaming methods. Understanding of some open source libraries such as FFmpeg, MPEG4IP and Live555 are also a part of the research.
Author: Wei Chen Publisher: ISBN: 9781369681208 Category : Languages : en Pages : 127
Book Description
With the popularity of and the advances in wireless networking technologies, wireless multimedia tra c has grown dramatically in recent years. Despite having many advantages, wireless multimedia services, particularly video services, still pose a number of challenges due to the time-varying, error-prone and bandwidth-fluctuating channels in the wireless networks. Therefore, provisioning end-to-end Quality of Service and Quality of Experience (QoS and QoE) of video transmission over wireless channels is of great importance. ☐ Video transmission is often described to be bursty as video is basically a sequence of frames transmitted at a particular frame rate. A video frame cannot be decoded or played out at the receiver side until all or most of its transmitted constituent packets are received in time. Depending on the application scenarios, video services may have different emphases in terms of QoE and QoS. While video streaming (e.g., Netflix and YouTube) allows for modest delay (on the order of a few seconds) at the beginning of the playout, video teleconferencing (e.g., FaceTime and WebRTC) is much more delay constrained (less than a few hundred milliseconds). This is because in real-time video systems, each frame must be delivered and decoded by its playback time, and any packet that is retransmitted due to loss in the last transmission or arriving late becomes useless when its stringent decoding and display deadline cannot be met. In this dissertation, we propose several optimization algorithms to improve the QoE and QoS for both video streaming (non real-time) and video teleconferencing (real-time) over wireless networks. ☐ In optimizing wireless video streaming, we focus on MPEG-DASH (ISO/IEC Standard 23009-1), the current standard for video streaming. We optimize video streaming by leveraging a technique called User Adaptive Video (UAV), which exploits the perceptual limits of the human visual system to modulate a video stream’s bit rate based on the viewing conditions, such as viewing distance and ambient illuminance, resulting in significant bandwidth saving without perceived loss of quality to the user. UAV presents an opportunity to significantly improve the e ciency of DASH by not requesting unnecessarily high bit rate videos. We design UAV-enabled DASH (UDASH) and evaluate its performance in Wi-Fi networks. Simulation results show that UDASH in a Wi-Fi network has the benefits of not only significantly improving the video streaming performance such as reducing the rebu ering probability, but also enhancing the performance of cross traffc. ☐ In addition, the MPEG-DASH standard uses TCP as the underlying transport layer protocol, and more importantly, TCP is one type of dominant tra c in the Internet. Therefore, we investigate how to improve TCP performance in wireless networks. We identify two issues of TCP performance degradation due to common channel errors via both analytical study and simulations in a typical Wi-Fi network. Motivated by these issues, a MAC layer optimization technique is proposed, which is based on the adaptation of the Retry Limit parameter after considering TCP traffic characteristics and throughput model. The evaluation results confirm that the proposed technique achieves higher performance gain. ☐ In optimizing video teleconferencing, we considerWebRTC, which is Google’s open source real-time communication framework. In wireless networks such as those based on IEEE 802.11, packet losses due to fading and interference are often misinterpreted as indications of congestion, causing unnecessary decrease in the data sending rate due to congestion control by the RTCP protocol working beneath WebRTC and above RTP. For delayconstrained applications such as video teleconferencing, packet losses may result in excessive artifacts or freeze in the decoded video. We propose a simple and yet effective mechanism to detect and reduce channel-caused packet losses by dynamically adjusting the retry limit parameter of the IEEE 802.11 protocol. Since the retry limit is left configurable in the IEEE 802.11 standard, and does not require cross-layer coordination, the proposed scheme can be easily implemented and incrementally deployed. We also propose to use a delay constrained retry limit adaptation algorithm to control transmission delays so that delay constraints required by different application scenarios can be met. Experimental results of applying the proposed scheme to aWebRTC based real-time video communication prototype show significant performance gain compared to the case where retry limit is configured statically. ☐ In addition to the optimization techniques proposed for the IEEE 802.11 protocol, we also propose a cross-layer approach to optimize video teleconferencing, termed early packet loss feedback (EPLF). In EPLF, if a packet loss is due to channel errors, the MAC layer directly feeds back the loss information to the RTP layer with a spoofed RTCP packet that carries a NACK message so that the RTP layer can retransmit the lost RTP packet. Since the whole feedback process takes place in the same device (the video sender), the latency is negligible in relation to the RTT, and hence the term ’early’ in EPLF. Theoretical analysis and prototype-based experimental results show that EPLF almost completely eliminates channelcaused video freezes in the decoded video while improving congestion control. ☐ Furthermore, we also apply the technique of UAV to video teleconferencing to further reduce bandwidth consumption, and build a prototype based on WebRTC and Licode (a video teleconferencing hub platform) to validate the bandwidth savings.
Author: Ce Zhu Publisher: CRC Press ISBN: 143988000X Category : Computers Languages : en Pages : 512
Book Description
Wireless video communications encompass a broad range of issues and opportunities that serve as the catalyst for technical innovations. To disseminate the most recent advances in this challenging yet exciting field, Advanced Video Communications over Wireless Networks provides an in-depth look at the fundamentals, recent technical achievements, challenges, and emerging trends in mobile and wireless video communications. The editors have carefully selected a panel of researchers with expertise in diverse aspects of wireless video communication to cover a wide spectrum of topics, including the underlying theoretical fundamentals associated with wireless video communications, the transmission schemes tailored to mobile and wireless networks, quality metrics, the architectures of practical systems, as well as some novel directions. They address future directions, including Quality-of-Experience in wireless video communications, video communications over future networks, and 3D video communications. The book presents a collection of tutorials, surveys, and original contributions, providing an up-to-date, accessible reference for further development of research and applications in mobile and wireless video communication systems. The range of coverage and depth of expertise make this book the go-to resource for facing current and future challenges in this field.
Author: Madhusanka Liyanage Publisher: John Wiley & Sons ISBN: 1118900278 Category : Technology & Engineering Languages : en Pages : 440
Book Description
This book describes the concept of a Software Defined Mobile Network (SDMN), which will impact the network architecture of current LTE (3GPP) networks. SDN will also open up new opportunities for traffic, resource and mobility management, as well as impose new challenges on network security. Therefore, the book addresses the main affected areas such as traffic, resource and mobility management, virtualized traffics transportation, network management, network security and techno economic concepts. Moreover, a complete introduction to SDN and SDMN concepts. Furthermore, the reader will be introduced to cutting-edge knowledge in areas such as network virtualization, as well as SDN concepts relevant to next generation mobile networks. Finally, by the end of the book the reader will be familiar with the feasibility and opportunities of SDMN concepts, and will be able to evaluate the limits of performance and scalability of these new technologies while applying them to mobile broadb and networks.
Author: Kai Dong Publisher: ISBN: Category : HTTP (Computer network protocol) Languages : en Pages : 105
Book Description
With the development of the Internet and mobile networks, video service in mobile devices has gained growing popularity. Guaranteeing a decent video service quality is, however, still quite challenging in wireless networks, due to the unstable features of radio channels. In this thesis, we investigate simulation and enhancement of video services based on the hypertext transfer protocol (HTTP) with adaptive streaming over wireless networks. Firstly, we implement a video service simulator to explore video quality monitoring and collection of performance metrics during content delivery. Then, we further propose a caching-based bitrate adaptation scheme for the purpose of video service quality enhancement. Instead of focusing on the traditional quality of service (QoS), we use a quality of experience (QoE) model for video performance evaluation. A series of experiments are conducted to assess the performance of our proposed bitrate adaptation scheme and compare it with several existing representative adaptation schemes. Experiments demonstrate that our proposed adaptation scheme outperforms the reference schemes by achieving higher mean opinion scores (MOS) as the QoE measure in a variety of network conditions.
Author: Xiaoling Qiu Publisher: ISBN: 9781124316062 Category : Languages : en Pages :
Book Description
Wireless networks is the fundamental component of next generation communication networks to provide users ubiquitous access. Due to the flexibility provided by wireless networks, users can access the network-based information and services anytime and anywhere. However, some emerging and popular multimedia applications, like Internet Protocol television (IPTV) and Multimedia Gaming, requiring high bandwidth and small delay, pose challenge for the last-mile wireless access network. Consequently, there is significant amount of research and development efforts in enhancing the performance of multimedia applications over wireless networks. This dissertation makes four important contributions towards that end. In Chapter 2, we study the various architectures, protocols and standards to support high quality video streaming over broadband mobile networks. We survey the most popular international video coding and compression standard ISO/IEC Moving Picture Experts Group-4 (MPEG-4) or ITU-T H.264. We also survey the next generation broadband mobile LTE (Long Term Evolution) network architecture and key technologies followed by video streaming delivery architectures and network protocols supporting video streaming over broadband mobile networks. Finally, we discuss possible future direction of video streaming in wireless networks. In Chapter 3, we propose an optimization algorithm to solve the key issue of bitrate switching in next generation HTTP-based adaptive video streaming. Our solution can provide the best possible viewing quality to users without playback interruption, which is reported as the biggest concern of on-line video streaming. The optimization algorithm is based on a specific streaming architecture and it can be easily integrated with other approaches and industry standards. Simulation results show that our optimization algorithm can determine the best video bitrate according to channel condition and buffered streams in local devices to provide viewers the best possible quality with least interruption. In Chapter 4, we propose a novel architecture and mechanism to delivery high quality video to users that use a wireless mesh access network. The novel mechanism consists of 1) a network route selection scheme which provides paths for multiple video streams with the least interference, called Minimum Interference Route Selection (MIROSE) and 2) an optimization algorithm that determines the compression rates depending on the network condition, called Network State Dependent Video Compression Rate (NSDVCR) algorithm. Simulation results show that our approach can provide significant improvement of video quality measured with Peak Signal-to-noise Ratio (PSNR) compared with standard routing protocols and default compression rates. In Chapter 5, we present a novel approach to collect multiple categories of data in a resource-limited wireless sensor network. In an advanced wireless sensor network capable of sensing and collecting multiple kinds of data, it is a challenging problem to efficiently and fairly collect various critical information when network has limited resources. We propose an optimization algorithm for the buffer management in the sensor node to provide higher event throughput, and maintain coverage fidelity when network is congested. Our detailed simulation analysis show that our proposed approach has significant performance improvement with respect to event throughput, fairness and the overall value of the information collected by the wireless sensor network. The dissertation proposes and validates a number of novel mechanisms and optimization algorithms to support the most challenging multimedia application namely, video, which has the dual requirements of high-bandwidth and small-delay, in various wireless networks. We first investigate the problem of providing high-quality video streaming in broadband mobile networks. We then enhance the video quality by 1) changing the video encoding and transmission techniques so as to be suitable for the wireless network; 2) designing a novel network architecture and protocol for video streaming; and 3) jointly altering the video compression and the network transport protocol.
Author: Sebastian Möller Publisher: Springer ISBN: 331902681X Category : Technology & Engineering Languages : en Pages : 431
Book Description
This pioneering book develops definitions and concepts related to Quality of Experience in the context of multimedia- and telecommunications-related applications, systems and services and applies these to various fields of communication and media technologies. The editors bring together numerous key-protagonists of the new discipline “Quality of Experience” and combine the state-of-the-art knowledge in one single volume.
Author: Fortino, Giancarlo Publisher: IGI Global ISBN: 1466617950 Category : Computers Languages : en Pages : 335
Book Description
"This book delivers state-of-the-art research on current and future Internet-based content delivery networking topics, bringing to the forefront novel problems that demand investigation"--
Author: K.R. Rao Publisher: CRC Press ISBN: 1420008226 Category : Technology & Engineering Languages : en Pages : 344
Book Description
With the rapid evolution of multimedia communications, engineers and other professionals are generally forced to hoard a plethora of different texts and journals to maintain a solid grasp on essential ideas and techniques in the field. Wireless Multimedia Communications provides researchers and students with a primary reference to help readers take maximum advantage of current systems and uncover opportunities to propose new and novel protocols, applications, and services. Extract the Essentials of System Design, Analysis, Implementation A complete technical reference, the text condenses the essential topics of core wireless multimedia communication technologies, convergence, QoS, and security that apply to everything from networking to communications systems, signal processing, and security. From extensive existing literature, the authors distill the central tenets and primary methods of analysis, design, and implementation, to reflect the latest technologies and architectural concepts. The book addresses emerging challenges to inform the system standardization process and help engineers combat the high error rates and stringent delay constraints that remain a significant challenge to various applications and services. Keep Pace with Detailed Techniques to Optimize Technology The authors identify causes of information loss in point-to-point signal transmission through wireless channels, and then they discuss techniques to minimize that loss. They use examples that illustrate the differences in implementing various systems, ranging from cellular voice telephony to wireless Internet access. Each chapter has been carefully organized with the latest information to serve dual purposes as an easy-to-reference guide for professionals and as a principal text for senior-level university students.
Author: 
Author: 
Author: Wei Chen
Author: Ce Zhu
Author: Madhusanka Liyanage
Author: Siphiwe Gift Nelwamondo
Author: Kai Dong
Author: Xiaoling Qiu
Author: Sebastian Möller
Author: Fortino, Giancarlo
Author: K.R. Rao