A computationally scalable fast intra coding scheme for HEVC video encoder

Multimedia Tools and Applications - The High Efficiency Video Coding (HEVC) adopts 35 intra prediction modes to provide a more precise intra prediction. As a result, HEVC intra coding is much more...     

A fast inter-frame encoding scheme using the edge information and the spatiotemporal encoding parameters for HEVC

Multimedia Tools and Applications - High Efficiency Video Coding (HEVC), as a novel video coding standard, has shown a better coding efficiency than all existing standards, such as H.264/AVC. It...     

Design and implementation of a teleconferencing system using improved HEVC coding

Teleconferencing has become an indispensable element in any business system, because it offers the opportunity for collaborators to participate in a virtual group while remaining in divergent regions. Teleconferencing also increases productivity, minimizes travel expenses and saves travel time. This paper presents a reliable Teleconference system that utilizes an improved high-efficiency video codec (HEVC) H.265 technology with congestion control. The improvement is based on CU size decision and entropy coding, which provides an adequate approach to enhance the real-time video/IP technology in terms of improved video quality and increased compression ratio compared to the previous codec (H.264) and original HEVC.     

Segmentation & bitstream encoding of foreground objects in HEVC encoder for edge computing environment

Multimedia Tools and Applications - Segmentation of foreground object is pivotal in identifying the other finer details about objects in a scene. Our work serves to investigate ways to not only...     

嵌入式智能家居监控系统的设计与实现

以S3C2410为核心,以Linux操作系统为平台,运用嵌入式视频服务器设计了嵌入式智能家居监控系统,实现了对家庭监控的智能化管理。同时通过GPRS和Internet实现了对家庭系统的远程控制。     

Design and implementation of a user-support system for scheduling using a smart phone

In recent years, the ability to manage schedules using a mobile device equipped with a touch panel has increased. However, when one wishes to add a new event to the schedule book while taking into account the transit time for an existing event, it is necessary to switch to another application or website. In this study, we design a system that determines automatically whether the new event can be added. If it is impossible to add the event, the system proposes a time range in which events can be added.     

基于ARM的嵌入式无线视频监控系统

介绍了一种基于ARM9高速嵌入式处理器和H.264高效压缩算法的嵌入式3G无线视频监控系统.分析了系统的总体结构、硬件结构,并重点阐述了系统软件的设计与实现.实验结果表明,该系统可以达到25帧/秒CIF图像(320×240),实现了视频流畅传输.     

个性化智能家庭供暖系统的设计与实现

分析了现有供暖系统的特点,结合智能家庭的发展趋势及个性化的应用需求提出了一种具有开放式、可扩展特点的新型智能型家庭供暖系统HeatingCare.进而重点研究了家庭暖气控制单元LHA中的供热控制模型及动态调节算法等核心技术.在分析、解决相关关键技术的基础上,最终在eBox与Windows CE构成的平台上成功实现了该嵌入式系统.     

全球数字广播系统音频编码器的软件实现

全球范围的数字广播系统DRM(Digital Radio Mondiale),是一种针对30MHz以下频段的数字声音广播系统。和传统广播系统相比,DRM数字广播系统在声音质量上是模拟调幅广播无法比拟的。这其中的关键之一在于DRM系统引入了新的信源编解码技术——MPEG-4标准的AAC(Advanced Audio Coding,先进音频编码)。在分析符合DRM标准的AAC音频编码器原理基础上,提出了一种改进的离散余弦变换算法,并在PC上实现了基于该算法的AAC音频编码器。实验表明,该软件编码器能够满足DRM系统实时性要求。     

城市停车场实时车位获取与分配研究

以实时获取空余车位和智慧分配车位为目标,基于射频识别技术和地理信息技术开发智慧停车系统原型。采用模糊决策矩阵,定量化驾驶员从当前位置到停车场的驾驶时间、停车费用、停车场至目的地的步行距离和停车场的空余车位数这4个车位分配影响因素的权重;在考虑空余车位有限和实时交通状况的前提下,提出带有4个条件矩阵的车位分配模型,并利用某市道路网、交通状况、停车场等数据在ArcGIS中进行模型实验,实验结果表明,该智慧停车系统具有一定的可行性和实际意义。     

IBM smart surveillance system (S3): event based video surveillance system with an open and extensible framework

The increasing need for sophisticated surveillance systems and the move to a digital infrastructure has transformed surveillance into a large scale data analysis and management challenge. Smart surveillance systems use automatic image understanding techniques to extract information from the surveillance data. While the majority of the research and commercial systems have focused on the information extraction aspect of the challenge, very few systems have explored the use of extracted information in the search, retrieval, data management and investigation context. The IBM smart surveillance system (S3) is one of the few advanced surveillance systems which provides not only the capability to automatically monitor a scene but also the capability to manage the surveillance data, perform event based retrieval, receive real time event alerts thru standard web infrastructure and extract long term statistical patterns of activity. The IBM S3 is easily customized to fit the requirements of different applications by using an open-standards based architecture for surveillance.     

智能卡COS的快速烧写技术研究与实现

对智能卡COS现有USB、串口读写器的烧写技术进行了研究与分析,提出了一种以ARM处理器为母片硬件平台,通过智能卡接口对其他智能卡COS进行快速烧写的片拷贝方法。该方法具有硬件设计简单、烧写速度快,稳定性、安全性高等优点,且易于扩展为批量智能卡COS烧写器平台。目前该技术已在贴片智能卡生产厂商得以全面应用,大大提高了COS的烧写效率,具有较好的应用前景。     

智能校园安防系统的设计与实现

针对目前校园安防中存在的不足,基于智能视频分析和IPSAN存储构架,设计了一种智能校园安防系统。该系统包括前端设备、信号传输和监控室三部分,主要可以实现预警功能、监视功能、录像功能、联网服务功能、周界防范报警联动等功能;文中重点阐述了智能分析子系统中跨线检测、区域入侵检测和异常事件检测功能的实现方法。实际应用表明,该系统运行稳定,功能完整,可应用于高校校园的安全监控等。     

一种智能家庭嵌入式系统的设计与实现*

针对电力线载波技术是实现家庭与个人信息化“最后10米”问题最有效手段之一,提出了一种基于电力线载波通信的家庭智能化解决方案;借助电力线的公共性,采用载波通信处理芯片,设计智能家庭嵌入式软件系统,实现对智能家庭管理的灵活性和便捷性。     

Fast coding unit (CU) determination algorithm for high-efficiency video coding (HEVC) in smart surveillance application

High-efficiency video coding (HEVC) is a successor to the H.264/AVC standard as the newest video-coding standard using a quad-tree structure with the three block types of a coding unit (CU), a prediction unit (PU), and a transform unit (TU). This has become popular to apply to smart surveillance systems, because very high-quality image is needed to analyze and extract more precise features. On standard, the HEVC encoder uses all possible depth levels for determination of the lowest rate-distortion (RD) cost block. The HEVC encoder is more complex than the H.264/AVC standard. An efficient CU determination algorithm is proposed using spatial and temporal information in which 13 neighboring coding tree units (CTUs) are defined. Four CTUs are temporally located in the current CTU and the other nine neighboring CTUs are spatially situated in the current CTU. Based on the analysis of conditional probability values for SKIP and Merge modes, an optimal threshold value was determined for judging SKIP or Merge mode according to the CTU condition and an adaptive weighting factor. When SKIP or Merge modes were detected early, other mode searches were omitted. The proposed algorithm achieved approximately 35 % time saving with random-access configuration and 29 % time reduction with low-delay configuration while maintaining comparable rate-distortion performance, compared with HM 12.0 reference software.     

Measurement and compensation of errors in absolute encoder using dual absolute encoder system

The dual absolute encoder (DAE) system is a measurement system for a motion control system that comprises two absolute encoders and one reduction mechanism. In terms of accuracy and measuring range, DAE is superior to ordinary dual encoder systems, which comprise one incremental encoder, one absolute encoder, and a reduction mechanism. In this study, we focus on the error measurement and compensation using DAE system. There have been many studies to measure and compensate for the errors in measuring systems. However, this typically demands high precision equipment to measure the errors, and attaching and detaching the equipment affects the errors. We measured the errors in the absolute encoder by using the DAE systems solely. The measured errors are modeled using harmonic functions and compensated for by using the modeled errors. The experimental results reveal that the maximum errors and mean absolute errors decrease by one-seventh and one-twelfth, respectively, after error compensation. As a result, we can compensate the errors in the encoders with the encoder system, itself. Additionally, the modeled errors in a DAE system are observed to remain constant even when changing the reduction ratios between two absolute encoders. Once the errors are measured and modeled in the DAE system, the modeled errors can be applied to a DAE system with a different reduction ratio for error compensation.

     

Scalable architecture for an automated surveillance system using edge computing

Over the past few years, the Internet of Things has gone from theoretical concept to our everyday living experience. The explosive growth of sensor streams also leads to a new paradigm of edge computing. In the surveillance system, edge-based automation is crucial to get fast response for fast data analytics among connected devices. In this paper, we propose an automated surveillance system to improve robustness and intelligence. Our scalable architecture is an alternative way of reducing the server resource and wireless network limitation.     

智能卡芯片操作系统的研究与实现

为了充分利用智能卡芯片有限的资源,开发出高效的、易扩充的芯片操作系统(COS),研究了智能卡COS设计和实现方法.介绍了智能卡COS的体系结构,设计了结构模型,从COS的主守护流程、通信管理、文件系统、安全管理和命令解释5个方面论述了智能卡COS的设计与实现.采用中断调度方式节省了系统开销,采用静态存储管理方式节约了存储空间.通过测试验证了COS符合国际标准和行业标准,该系统能正确应用在终端和相应网络环境中,具有良好的兼容性和稳定性.     

视频监控存储系统的设计与实现

针对文件系统存储视频数据时存储效率低和检索性能差的问题,提出一种基于裸盘设备的视频数据专用存储方案,实现了视频数据的高效存储和秒级检索。针对多路视频流的并发写入控制,采用单线程非阻塞I/O复用技术和"乒乓缓冲"机制,避免多路视频流并发写入时的阻塞问题;针对视频监控系统媒体转发服务器的时钟漂移问题,采用基于两级索引的回馈定位技术,提高系统对服务器钟差的容错能力。系统测试结果表明,相对于文件存储,"时间索引+数据块"存储方式的视频检索效率不受数据规模大小影响,多路并发写入时,单线程非阻塞I/O复用和"乒乓缓冲"机制能有效避免阻塞现象的发生。     

Control structures for data-parallel SIMD languages: semantics and implementation

We define a simple language which encapsulates the main concepts of SIMD data-parallel programming, and we give its operational semantics. This language includes a unique data-parallel control structure called multitype conditioning and escape. We show that it suffices to express all data-parallel extensions of usual scalar control structures of C, as found in C^*, MPL, POMPC, etc. Moreover, we give a formal correctness proof for two different implementations of this new statement, respectively by a single context stack, and by a set of counters. Thus, this simple language appears as an interesting basis to study data-parallel SIMD programming methodology.