一种基于帧图像的动态视觉传感器样本集建模方法

动态视觉传感器（Dynamic Vision Sensor,DVS）利用事件驱动原理实现运动目标的快速提取,具有低延迟、低存储空间和高动态范围等优势.目前研究表明,基于DVS的神经网络在目标检测等领域具有明显的速度优势.但是,这类神经网络在训练时所需要的样本集主要依赖DVS相机产生,缺少高效的样本集生成方法,这制约了这类神经网络的应用与发展.本文根据DVS原理,提出了一种基于帧图像的DVS建模以及样本集建模方法.该方法设定每个像素单元独立工作,经过动态差分和逻辑判断后输出触发的地址-事件数据,这些数据通过编码和归一化生成神经网络训练时所需要的样本集.通过对MNIST和CIFAR-10样本集建模的实验结果表明,该建模方法效果与DVS相机基本一致;与基于帧图像的存储方式相比,该样本集可以明显减少存储空间.该方法所生成样本集已经通过卷积神经网络训练和测试验证.     

虚拟演播室技术及制作流程综述

虚拟演播室技术的产生，解决了传统演播室节目制作中存在的问题和局限，它具有置景费用低、更换布景方便、便于发挥主创人员创意的特点，特别适合中小型的播报类和访谈类节目。本文介绍了虚拟演播室系统的构成及摄象机跟踪、虚拟场景设计与生成、蓝箱、灯光布光等关键技术；以《民营之道》节目为例，简单介绍虚拟演播室的制作流程；并对虚拟演播室技术的发展进行了展望。     

The ORIGAMI Project: Advanced tools for creating and mixing real and virtual content in film and TV production

The goal of the EC-funded IST project ORIGAMI was the development of advanced tools and new production techniques for high-quality and seamless integration of real and virtual content in film and TV productions. In particular, the project focused on pre-production tools for automatic virtual set creation through image-based 3-D modelling of environments and objects. One key goal of the project was to achieve real-time in-studio pre-visualisation of the virtual elements (objects and actors) of the extended set. In this contribution the studio pre-visualisation system that has been developed for the project is illustrated, and its usage within a high-end film and TV production environment is described. Furthermore an overview of the developed solutions for automatic generation of 3-D models of environments, static objects and (moving) actors is given.     

Three-dimensional input device with six degrees of freedom

Commodity priced PCs now come with powerful three-dimensional (3D) graphic capabilities that allow new applications to incorporate 3D interactivity. But, there are few low cost 3D input devices available for the desktop non-immersive virtual reality (VR) applications. Interactive systems that use a 3D world should ideally be complimented with a 3D input device. Such devices have previously been built mainly for immersive virtual reality systems and are not well suited for desktop systems. They are also expensive. Our device is intended to provide a low cost, intuitive full 3D input with six degrees of freedom. As well, it was to be used with the non-dominant hand, freeing the other hand for finer-motor skills to use a conventional mouse or the keyboard. We have built a prototype device that was inspired by the mechanics of the gimbal mount for a gyroscope. We used a field programmable gate array (FPGA) to provide rapid prototyping of the electronics from the sensors to the computer. Initial evaluation shows promise but also some problems together with suggestions for improvements.     

桌面虚拟化模式研究

信息技术(information technology,IT)的发展使得各类IT终端的用户类型越来越多,而通用桌面虚拟化方法已无法满足用户多样性的要求。通过桌面虚拟化技术可确保每个用户可以接入适当的桌面和应用,从而满足用户的需求,而不受单一技术的限制。针对一种或多种工作场景,提出了托管共享桌面、托管虚拟桌面基础结构(virtualdesktop infrastructure,VDI)桌面、流虚拟磁盘(virtual hard disk format,VHD)桌面、物理桌面、本地虚拟机(virtual ma-chine)桌面、按需应用等6种桌面虚拟化模式,并分析了各种桌面模式的优势及适用场景。     

虚拟演播室技术在教育电视中的应用探索

虚拟演播室技术为教育技术工作者把先进的教育思想整合到目前的教育教学实践中开拓了思路,成为教育教学的重要辅助手段。阐述虚拟演播室的原理、类型,并结合虚拟演播室技术的应用,探讨基于虚拟演播室的教学模式在教育教学应用中的优势及其发展趋势。     

市级气象高清数字虚拟演播室建设研究

针对目前地市气象影视节目收视率普遍较低、节目质量无法满足人们观赏要求的情况,设计了芜湖市气象高清数字虚拟演播室建设方案。重点论述了演播室蓝箱、声学系统、灯光系统、视音频系统、虚拟演播系统及非编系统建设中需要重点解决的几个问题和难点,保证了芜湖市气象高清数字虚拟演播室技术定位准确、业务衔接顺畅、栏目质量提高明显。芜湖市高清数字虚拟演播室的建成及投入业务使用,开创了在安徽地市级气象影视部门应用的先河,为在地市级气象影视部门中的搭建和运行积累了丰富的经验。     

虚拟演播室布光技术初探

随着广播电视数字化的不断发展,虚拟演播室的应用越来越广泛。虚拟演播室照明不同于传统演播室,对灯光的照度、照明方式有着全新的要求。虚拟演播室系统灯光照明的设计和安排直接决定了电视画面的质量,也就是说灯光照明在节目创作中既有技术性,同时又具有艺术性,需要我们在工作中,不间断地积累、研究、掌握,力争做到在技术中延伸出艺术。主要介绍虚拟演播室的布光技术及相关注意事项。     

一种高效的面向虚拟桌面恶意代码检测机制简

 与传统的恶意代码检测方式相比,面向虚拟桌面的恶意代码检测方法面临着性能方面的挑战,同一物理服务器上多个虚拟桌面同时开展恶意代码检测使得磁盘等硬件成为严重的IO性能瓶颈.本文提出了一种高效的虚拟桌面恶意代码检测方案,基于母本克隆技术的虚拟桌面恶意代码检测机制（MCIDS）,MCIDS根据虚拟桌面系统的特点,通过系统映像网络存储克隆技术以及部署在网络存储系统中的恶意代码引擎减少虚拟桌面系统中的恶意代码检测范围,有效减少恶意代码检测所需的磁盘IO开销;同时MCIDS还克服了传统“Out-of-the-Box”安全检测机制存在的语义差别问题,改善了系统的安全性能.在原型系统上的实验显示该方法在技术上是可行的,与现有方法相比MCIDS具有较好的性能优势.     

虚拟演播室在县级电视台的应用

县级电视台利用虚拟演播室只需要计算机就可以制作出各种与栏目主题相称的场景,并存入计算机中,制作节目时再调出使用,非常方便,使一个演播室被多套栏目利用,大大降低了栏目多样化带来的对空间、时间及财力的要求。     

高校虚拟演播室系统应用研究

当今世界已进入信息时代,各高校都在大力发展自己的信息技术、信息通讯设施和信息产业,虚拟演播室为教育、教学、科研提供了新的途径。介绍虚拟演播室系统的关键技术,提出适应高校需求、面向师生、服务于师生的高校虚拟演播室系统的设计方案,并对虚拟演播室系统在高校中的应用进行探讨。     

Synthesizing Energy-Efficient Embedded Systems with LOPOCOS

In this paper, we introduce the LOPOCOS (Low Power Co-synthesis) system, a prototype CAD tool for system level co-design. LOPOCOS targets the design of energy-efficient embedded systems implemented as heterogeneous distributed architectures. In particular, it is designed to solve the specific problems involved in architectures that include dynamic voltage scalable (DVS) processors. The aim of this paper is to demonstrate how LOPOCOS can support the system designer in identifying energy-efficient hardware/software implementations for the desired embedded systems. Hence, highlighting the necessary optimization steps during design space exploration for DVS enable architectures. The optimization steps carried out in LOPOCOS involve component allocation and task/communication mapping as well as scheduling and dynamic voltage scaling. LOPOCOS has the following key features, which contribute to this energy efficiency. During the voltage scaling valuable power profile information of task execution is taken into account, hence, the accuracy of the energy estimation is improved. A combined optimization for scheduling and communication mapping based on genetic algorithm, optimizes simultaneously execution order and communication mapping towards the utilization of the DVS processors and timing behaviour. Furthermore, a separation of task and communication mapping allows a more effective implementation of both task and communication mapping optimizationsteps. Extensive experiments are conducted to demonstrate the efficiency of LOPOCOS. We report up to 38% higher energy reductions compared to previous co-synthesis techniques for DVS systems. The investigations include a real-life example of an optical flow detection algorithm.     

Modeap: Moving Desktop Application to Mobile Cloud Service

Thanks to the availability of various mobile applications, lots of users shift from desktop environments, e.g., PCs and laptops, to mobile devices, e.g., smartphones and tablets. However, there are still some desktop applications without counterparts on mobile devices, such as some integrated development environments (e.g., eclipse) and automatic industry control systems. In this paper, we propose Modeap, a platform-independent mobile cloud service that can push all desktop applications developed for various operating systems from cloud servers to mobile devices. Modeap follows a design principle of complete detachment and regeneration of desktop user interface, i.e., the essential graphical primitives of the original desktop applications will be intercepted and then translated into standard web-based graphical primitives such that the interactions between users and remote cloud applications become possible via mobile web browsers. In this way, all desktop applications built upon the same set of graphical primitives can be used on mobile devices in great flexibility without installing any new software. We have developed a proof-of-concept prototype that provides Windows applications from cloud server to mobile web browsers. The results of extensive experiments show that the proposed framework can achieve our design goals with low latency and bandwidth consumption.     

Live RGB-D camera tracking for television production studios

In this work, a real-time image-based camera tracker is designed for live television production studios. The major concern is to decrease camera tracking expenses by an affordable vision-based approach. First, a dense keyframe model of the static studio scene is generated using image-based dense tracking and bundle adjustment. Online camera tracking is then defined as registration problem between the current RGB-D measurement and the nearest keyframe. With accurate keyframe poses, our camera tracking becomes virtually driftless. The static model is also used to avoid moving actors in the scene. Processing dense RGB-D measurements requires special attention when aiming for real-time performance at 30 Hz. We derive a real-time tracker from our cost function for a low-end GPU. The system requires merely a RGB-D sensor, laptop and a low-end GPU. Camera tracking properties are compared with KinectFusion. Our solution demonstrates robust and driftless real-time camera tracking in a television production studio environment.     

教育虚拟演播室技术

虚拟演播室是在高速图形计算机和视频色键基础上发展起来的演播室技术.在虚拟演播室系统中,现场视频可以实时地与计算机产生的三维图形完美无缺地集成在一起,是对传统的教育电视演播室技术的一次重大变革.本文讨论了虚拟演播室系统的原理、技术途径以及系统评价等问题.     

ORAD虚拟演播室场景播出控制工具Maestro探讨

虚拟演播室虚拟图文直播系统在整个虚拟演播室节目制作中对演播室的最终播出起着举足轻重的作用,作者结合虚拟演播室的实践经验,对ORAD虚拟演播室图文直播系统中的Maestro的特点、运行Maestro所需要的软硬件设备、Maestro的应用及播出进行了探讨。     

云桌面在高校中的应用

云桌面融合了企业级服务器与虚拟化平台产品的功能和优势,能够将用户的桌面环境以虚拟机的形式托管到数据中心内的高性能服务器上.管理员可以实现对所有云桌面资源进行可视化的便捷管理,快速地批量部署云桌面满足大量用户的需求等操作.用户可以通过PC、瘦客户机等多种终端使用自己的云桌面,方便地完成日常办公、教学、管理等任务.     

数字化三维虚拟演播室系统方案设计

数字化三维虚拟演播室系统将摄像机现场拍摄人物活动图像和三维虚拟物体图像制作进行数字化的实时完美结合.首先介绍了数字化三维虚拟演播室的特点,然后叙述了三维虚拟演播室系统项目需求,最后从设计原则、系统结构设计、系统设备、系统显著特点等方面阐述新余台数字化三维虚拟演播室系统的设计方案.     

影视传媒类高校虚拟演播技术应用研究

随着虚拟技术的快速发展,虚拟演播技术特别是虚拟演播室技术在影视行业的应用越来越广泛,但虚拟演播室技术的教学模式及虚拟技术人才的培养还相对滞后。结合虚拟演播技术应用于影视传媒类专业教学及人才培养的特点,就虚拟演播室的构建、专业教学中的技术要点及虚拟技术人才培养进行了探讨。     

桌面虚拟化及其安全技术研究

桌面虚拟化(Desktop Virtualization)是将用户桌面与用户机器相分离,使得用户可以随时随地以任何设备对个人桌面进行访问的技术。它是虚拟化技术在应用层面的一个分支,其他分支还包括服务器虚拟化、存储虚拟化、网络虚拟化等。文中对应用最为广泛的桌面虚拟化交付技术——虚拟桌面基础设施的原理、优势、尚待解决的问题、安全需求等方面进行了研究与探讨。