Ultra-Lightweight Face Animation Method for Ultra-Low Bitrate Video Conferencing

Video conferencing systems face the dilemma between smooth streaming and decent visual quality because traditional video compression algorithms fail to produce bitstreams low enough for bandwidth-constrained networks.An ultra-lightweight face-animation-based method that enables better video conferencing experience is proposed in this paper.The proposed method compresses high-quality upperbody videos with ultra-low bitrates and runs efficiently on mobile devices without high-end graphics processing units(GPU).Moreover,a visual quality evaluation algorithm is used to avoid image degradation caused by extreme face poses and/or expressions,and a full resolution image composition algorithm to reduce unnaturalness,which guarantees the user experience.Experiments show that the proposed method is efficient and can generate high-quality videos at ultra-low bitrates.

A Novel Objective Quality Assessment Method for Video Conferencing Coding

Most recently, due to the demand of immersive communication, region-of-interest-based(ROI) high efficiency video coding(HEVC) approaches in conferencing scenarios have become increasingly important. However, there exists no objective metric, specially developed for efficiently evaluating the perceived visual quality of video conferencing coding. Therefore, this paper proposes a novel objective quality assessment method, namely Gaussian mixture model based peak signal-tonoise ratio(GMM-PSNR), for the perceptual video conferencing coding. First, eye tracking experiments, together with a real-time technique of face and facial feature extraction, are introduced. In the experiments, importance of background, face, and facial feature regions is identified, and it is then quantified based on eye fixation points over test videos. Next, assuming that the distribution of the eye fixation points obeys Gaussian mixture model, we utilize expectation-maximization(EM) algorithm to generate an importance weight map for each frame of video conferencing coding, in light of a new term eye fixation points/pixel(efp/p). According to the generated weight map, GMM-PSNR is developed for quality assessment by assigning different weights to the distortion of each pixel in the video frame. Finally, we utilize some experiments to investigate the correlation of the proposed GMM-PSNR and other conventional objective metrics with subjective quality metrics. The experimental results show the effectiveness of GMM-PSNR.

Utilization of HEVC ChaCha20-Based Selective Encryption for Secure Telehealth Video Conferencing

Coronavirus(COVID-19)is a contagious disease that causes exceptional effect on healthcare organizationsworldwide with dangerous impact on medical services within the hospitals.Because of the fast spread of COVID-19,the healthcare facilities could be a big source of disease infection.So,healthcare video consultations should be used to decrease face-to-face communication between clinician and patients.Healthcare video consultations may be beneficial for some COVID-19 conditions and reduce the need for faceto-face contact with a potentially positive patient without symptoms.These conditions are like top clinicians who provide remote consultations to develop treatment methodology and follow-up remotely,patients who consult about COVID-19,and those who have mild symptoms suggestive of the COVID-19 virus.Video consultations are a supplement to,and not a substitute for,telephone consultations.It may also form part of a broader COVID-19 distance care strategy that contains computerized screening,separation of possibly infectious patients within medical services,and computerized video-intensive observing of their intensive care that helps reduce mixing.Nowadays,the spread of the COVID-19 virus helps to expand the use of video healthcare consultations because it helps to exchange experiences and remote medical consultations,save costs and health procedures used to cope with the pandemic of the COVID-19 virus,and monitor the progress of treatment plans,moment by moment from a distance with precision,clarity and ease.From this perspective,this paper introduces a high-efficiency video coding(HEVC)ChaCha20-based selective encryption(SE)scheme for secure healthcare video Consultations.The proposed HEVC ChaCha20-based SE scheme uses the ChaCha20 for encrypting the sign bits of the Discrete Cosine Transform(DCT)and Motion Vector Difference(MVD)in the HEVC entropy phase.The main achievement of HEVC ChaCha20-based SE scheme is encrypting the most sensitive video bits with keeping low delay time,fixed bit rate of the HEVC,and format compliance.Experimental tests guarantee that the proposed HEVC ChaCha20-based SE scheme can ensure the confidentiality of the healthcare video consultations which has become easy to transmit through the internet.

The Design and Implementation of Qt-based Cross-platform Video Conferencing Remote Control

In order to overcome the defects of the dedicated video conference remote control, this paper designs and implements a Qt-based cross-platform video conferencing remote control. The remote control not only implements a full range of video conferencing control functions with an easy-to-use visual interface;but also implement cross-platform feature to allow users to use remote control software on their own equipment. It is economic, convenient and stylish for users. This paper mainly describes the design and implementation of remote control system framework and cross-platform features. Finally, the result in the paper shows: This remote control is reliable and easy to use.

Can Video Conferencing Be as Easy as Telephoning?—A Home Healthcare Case Study

In comparison with almost universal adoption of telephony and mobile technologies in modern day healthcare, video conferencing has yet to become a ubiquitous clinical tool. Currently telehealth services are faced with a bewildering range of video conferencing software and hardware choices. This paper provides a case study in the selection of video conferencing services by the Flinders University Telehealth in the Home trial (FTH Trial) to support healthcare in the home. Using pragmatic methods, video conferencing solutions available on the market were assessed for usability, reliability, cost, compatibility, interoperability, performance and privacy considerations. The process of elimination through which the eventual solution was chosen, the selection criteria used for each requirement and the corresponding results are described. The resulting product set, although functional, had restricted ability to directly connect with systems used by healthcare providers elsewhere in the system. This outcome illustrates the impact on one small telehealth provider of the broader struggles between competing video conferencing vendors. At stake is the ability to communicate between healthcare organizations and provide public access to healthcare. Comparison of the current state of the video conferencing market place with the evolution of the telephony system reveals that video conferencing still has a long way to go before it can be considered as easy to use as the telephone. Health organizations that are concerned to improve access and quality of care should seek to influence greater standardization and interoperability though cooperation with one another, the private sector, international organizations and by encouraging governments to play a more active role in this sphere.

Analysis of the Effects of Rainfall Intensity into the Performance of Video Conferencing

Attenuation due to rain is an important limitation in the designing of the microwave communication links operating at frequencies above 10 GHz. Video conferencing performs over high-speed link via high-speed satellite (WINDS satellite) transmission in the Ka-band which is vulnerable to attenuation due to rain. Using the ITU-R proposed models for the prediction of rain attenuation gives a good estimation for the microwave propagation loss caused by rain for the temperate regions, but it underestimates the rain attenuation prediction for the monthly variation of rain rate by averaging annual rain rate for particular region. This study was carried out at the University of Rwanda/Huye Campus. The rain rates were predicted for 0.01 percentage of time from rainfall data measured during two months of July and August using the RD-80 Joss and Waldvogel Disdrometer. From the data collected and analyzed, compared with ITU-R model, we can see that where Rwanda region is situated in region K, what is different from the obtained results because the data are collected during months that coincide with a dry season.

The Use of Video Conferencing for Persons with Chronic Conditions: A Systematic Review

The purpose of this paper is to present a systematic review of studies that used Video Conferencing (VC) intervention for common chronic conditions. Chronic conditions account for the majority of poor health, disability, and death, and for a major portion of health-care expenditures in the United States. Innovative methods and interventions are needed to enhance care and management, improve access to care, improve patient outcomes, narrow health disparities and reduce healthcare costs. Video Conferencing could be particularly relevant in improving health, care management, access and cost in the care of chronic illnesses. A comprehensive literature search process guided by the PRISMA statement led to the inclusion of 27 articles measuring video conferencing, at least one chronic illness, and patient outcomes for adults living in a community setting. While VC has been found to be feasible and effective, a low number of randomized controlled trials limit evidence. In addition, studies in this review were not designed to address the question of whether access to care in rural areas is improved through VC. Hence, more research is needed.

VCSW—An RTP/RTCP-Based Video Conferencing System On WAN

This paper chiefly introduces the model of Video Conferencing System, H.323 standard of ITU- T and RTP/RTCP protocol, and realizes a WAN- Oriented Video Conferencing System—VCSW (Video Conferencing System on WAN). In VCSW, RTP/RTCP pro- tocol is used for transporting media data and video conference on WAN can be established, so VCSW has abroad application scope. This paper stresses analyzing RTP/RTCP protocol, realizes it and modifies some details of it according to our device condition: re- duces some fields of RTP and RTCP header, removes some information managed by RTP/RTCP. Consequently in testing of lab, good effect is achieved.

Videoconference Interpreting in Criminal Proceedings

With the increase of bi-and multilingual proceedings,videoconference interpreting(VCI)has become common practice in many areas of national and cross-border criminal proceedings.However,the use of VCI has been impeded by some limits,such as no clear guidelines,lack of training,emotional issues,equipment limits,interaction impacts and inability to represent.Various measures thereby do need to be taken to improve VCI in guidelines,training,three-way interaction,technical support,and location of the defendant solicitor.Though basic practical problems can be addressed quickly,the combined complexities of it with both technological and linguistic-cultural mediation require further research.

视频会议环境下面向语义通信的高鲁棒视频重建方法

在传统的视频会议场景中,如果用户网络带宽不足,就会出现严重的时延,卡顿现象,从而导致用户体验较差。与此同时,随着深度学习等技术的发展,目前已经出现了效果逼真的视频重建方法。现有的基于深度学习的视频重建方法可以很好地解决传统视频会议技术的带宽不足问题,其基于语义通信有广阔的应用前景,然而,当前视频重建方法在面部大幅扭动情况下重建效果差。针对这一挑战,提出了一种视频会议环境下面向语义通信的高鲁棒视频重建方法。首先,改进了现有的视频重建算法,引入来自于原始视频的压缩语义特征构建了新的面向语义的视频重建模型,其次,针对视频会议场景,提升了重建分辨率并设计了完整的视频重建方法。最后,实验和仿真结果表明,所提方法相比于传统视频会议方案降低了约三分之二的带宽,同时所提方法的重建效果,相比于当前基于深度学习的视频重建效果更具有鲁棒性,验证了所提视频重建方法的性能优势。

国家图书馆视频会议系统设计与实现

随着信息化、网络化的快速发展,视频会议以其效率高、操作简便、资源节约及利于扩展等优势,成为线上首选的沟通、交流方式。文章结合国家图书馆的初代视频会议系统特点,分析了新建视频会议系统所面临的挑战,提出了国家图书馆与文旅部视频会议系统、国家图书馆内部视频会议系统的设计思路与实现方式,并阐述了2套系统的应用场景。

IP视频会议系统中音视频同步的研究

随着自动化和信息化的迅猛发展,IP视频会议系统在现代社会中扮演着至关重要的角色。计算机网络的广泛应用也带来了日益复杂和多样化的网络安全威胁,这些威胁可能导致音视频在传输过程中出现中断。视频会议系统可以让来自世界各地的用户轻松地进行远距离交流,让所有参与者都可以通过屏幕切换来实现即时沟通。视频会议不仅可以播放音视频,还可以分享会议文件和静态影像。目前,视频会议已经成为企业内部以及企业之间进行有关沟通的关键基础。人们也开始加强对视频会议系统的研发和创新。基于此,文章重点研究IP视频会议系统中音视频同步技术以及实际应用。

量子保密通信技术在大型活动中的应用探索

随着互联网、物联网、5G等技术的快速发展,近年来信息安全问题频发并呈现出愈加复杂的趋势。在大型活动中必须对数据加以有效保护,保障数据不会由于偶然或者恶意的原因遭受到未经授权的访问、泄露、破坏、修改、审阅、检查、记录或销毁,并保障信息系统和业务的持续运行。量子保密通信是信息理论安全的量子密钥分发技术和安全的密码算法等结合形成的加密通信安全解决方案。

河南省地震局云视频会议系统建设与应用

河南省地震局硬件视频会议系统建设于2015年前后,使用期间极大地提高了办公效率,节约了办公经费。但是随着设备使用年限的增加以及视频会议技术的不断发展,宝利通设备故障频发,软硬件配置也严重滞后,已无法满足当下的工作需求。因此,依托河南省地震局现有IP网络,建设了云视频会议系统,实现了MCU云化部署。该系统基于H.323、SIP协议的技术标准,保证了视频会议终端和MCU互联互通,根据GB28181标准为视频监控和视频会议互联互通提供技术依据,最终实现不同视频会议软、硬终端及监控系统的完全融合,满足国家、省、市多级会议会商、视频会议、视频培训及应急处置的需要。

专业化视频会议架构建设与新技术研究

随着科技的不断发展,各系统单位对专业化视频会议的技术需求日益提升。在架构建设较为统一的背景下,专业化视频会议的场景设计正变得愈加多样化,同时,智能平台、网络适应、人工智能(Artificial Intelligence,AI)等新技术的应用也愈加广泛。在保障保密的前提下,管理、安全及智能化方面的创新已成为专业视频会议系统的新特征。基于此,概述视频会议的定义及其规模,阐述专业化视频会议系统的应用场景和系统架构,探讨专业化视频会议系统的新技术及其未来发展方向。

高可靠性视频会议系统的设计与实现

针对传统模拟音视频会议系统普遍存在的声音效果差、不具备分级视频功能和通信连续性差的缺点,结合某政企单位视频会议系统升级项目,介绍基于多层网络架构的高可靠性视频会议系统的组网方案和建设实践,以供相关从业人员参考。

基于5G的移动互联网视频会议系统设计

文中针对现有的互联网会议系统的缺陷,采用C/S与B/S的混合结构构建视频通信系统,并利用Eclipse整合式开发工具进行测试与调整,设计与实现了一个基于安卓系统的视频会议系统,并对其进行了优化调整,同时对现有版本的功能模块作出了相应更新。针对客户特定业务场景,还加入了无人机视频巡视功能,通过手机5G网络与传统会议管理系统对接,可以有效地提高客户使用体验感,并在一定程度上增加他们的主动投入程度,促进更有效的对话环境,使原本枯燥的线上讨论过程转变得生动活泼。

基于云计算的可视化远程医疗视频会议系统

现有视频会议系统自适应能力较差,在低带宽条件下存在视频图像模糊、卡顿等问题,导致其医疗诊断质量不佳。为解决这一问题,文章引入了云计算技术,开展了可视化远程医疗视频会议系统的设计研究。该系统的硬件部分主要由电视会议终端、多点控制单元和传输网络3部分组成。文章通过精心选择VOD服务器和流媒体服务器,完成了硬件部分的设计,并以此为基础,完成了软件部分设计,采用基于云计算的集中混合会议模式,并结合远程医疗视频诊断与结果的可视化技术,确保了系统的高效运行。实验结果表明,新的视频会议系统能够在较差的带宽条件下依然保持视频图像的清晰度和流畅性,具有更高的自适应能力,可为医疗咨询与诊断服务提供更有力的技术支持。

智能会议室视频会议系统设计及技术研究

智能会议室视频会议系统是一种利用现代技术,实现远程协作的高效工具。文章首先介绍了智能会议室中视频会议系统的构成,其次从设计原理和具体实施两个角度进一步阐述了智能会议室中视频会议系统设计,最后对视频会议系统在智能会议室中的关键技术和应用进行了研究,旨在为该领域的发展提供参考。

基于SIP的铁路云视频会议系统优化方案研究

针对当前铁路云视频会议系统内外网音视频信息传输性能存在不足、国铁集团各级单位常态化应用模式下视频会议需求持续增加等问题,结合系统使用特点,采用比H.323协议更具优势的会话初始协议(SIP)优化音视频信息传输技术,通过搭建最小功能单元测试系统对各项功能进行测试,验证了系统会议功能得以丰富和完善,传输时延等关键性能得以提升。同时,对比分析集中式、二级平台(同构/异构)、分布式和背靠背等部署模式的优缺点,提出基于SIP的系统总体架构部署方案,为未来系统实现扩容升级提供有利的技术支撑。