High-resolution spectral analysis with arbitrary spectral centers and arbitrary spectral resolutions

Spectral decomposition via banks of narrowband filters is a classic method of analyzing broadband acoustic signals. FFT algorithms and hardware efficiently perform narrowband analysis but are limited to constant bandwidths at fixed spectral center frequencies. We develop a technique for processing FFT outputs to realize banks of narrowband filters for which spectral band centers and spectral bandwidths may be arbitrarily assigned. In particular we present spectral analyzer configurations with spectral centers uniformily spaced on a logarithmic scale and with bandwidths proportional to center frequencies (constant Q filters) or with bandwidths proportional to the square root of center frequencies (root-proportional filters for linear FM line tracking).     

基于ARM11-Linux的视频采集传输系统的研究

研究了一种基于ARM 11的视频采集无线传输系统,实现了主体家庭网关通过摄像头对各个分散房间的有效监控.系统选用ARM 11内核的S3C6410作为系统处理器,CMOS摄像头OV9650作为采集端,在自主设计的硬件平台上搭建Linux软件系统,利用系统内部的V4L2提供的数据结构、应用函数等完成摄像头的采集;在传输系统方面,采用传输速度较快的WIFI-Ad-Hoc模式(端对端传输),依靠TCP/IP协议的传输方式使采集端与家庭网关之间建立连接,成功实现家庭网关对各个分散采集点视频信息的接收.     

Computer video acquisition and analysis system for biological data

The BIAS (Biological Image Analysis System) was developed to: (i) permit accurate entry and image processing of biological data; (ii) minimize the need for specialized hardware; and (iii) aid in the human genome mapping and other projects. The first mouse/cursor key-driven module was designed to be user interactive and readily accessible to many laboratories. It contains the DRSNDS programs which automate the entering of data in a systematic format. The types of data that can be entered utilizing this module are DNA-RNA gels from either a positive or negative Polaroid image, autoradiograms or biotinylated images from Southern, Northern and dot or slot blot hybridization analyses. The image is acquired using a video camera and then digitized for subsequent analysis. During the analysis graphical representations of the intermediate results are provided to assure user confidence. At any point within the program the user may obtain on-line help with the current task. The output displays the mol. wt of each individual component in the appropriate context. The present version of the program produces results comparable with a human interpreter for some data. Band shifting and optical density calculations are in a prototype form to permit evaluation of various techniques. Future work is directed at expanding the system's capabilities to interpret data from other biological analyses including DNA sequencing gels.     

基于FPGA的高清视频采集系统设计

设计了一种基于HDMI接口的全高清(分辨率1 920×1 080)视频采集与显示系统,该系统以Xilinx公司Spartan6系列FPGA作为控制芯片,采用500万像素级别CMOS摄像头OV5640作为前端数据源,能够采集全高清视频信号;为了解决由于高速大容量视频数据缓存容量和速率不足导致的拖影现象,该系统采用了一块Micron公司4 Gbit容量的DDR3 SDRAM作为缓存介质,再结合乒乓操作,能妥善解决高速大容量数据的缓存问题;该系统选用Silion Image公司的SiI9134作为HDMI接口芯片,能有效支持全高清视频信号输出。该系统可应用于军用监控系统、民用多媒体系统以及医学等领域。     

医学视频流采集系统的设计与实现

主要介绍医学视频流采集系统的系统结构、采集技术及视频流与数据库的关联技术。重点探讨了Video for Windows的视频采集方案。由于各视频卡厂商一般都支持VFW标准,该技术具有不依赖于硬件的特点。该系统为国产化PACS提供了一种解决思路。     

基于RTP的嵌入式网络化视频采集压缩系统

在分析视频压缩H.264/AVC标准的基础上,采用DSPTMS320C6416和ARM微控制器,设计并实现了一个灵活、高性能的支持网络化传输的视频压缩平台.详细描述了系统结构原理、各部分硬件设计和编码算法过程.该平台把DSP的强大运算功能与嵌入式微处理器的网络传输和远程控制功能相结合,能满足压缩算法多种多样而且复杂的要求,支持RTP/UDP/IP网络协议互联.在工业以太网环境下应用表明,系统具有优秀的PSNR性能.     

图像匹配系统中的一种视频采集与存储方案

本文主要阐述了实时图像处理系统中的一种视频采集与存储方案,讨论了设计中的难点与要点。视频图像的采集与存储都是由FPGA来进行控制,采用硬件描述语言(Verilog)和自顶向下的设计方法在可编程器件(XC3S400)上实现了具体电路。实践应用中表明这种方案工作稳定可靠,而且具有一定的灵活性。     

基于CAN总线的井下视频信号采集系统设计

深井环境恶劣,要求测井仪器可靠性高、数据处理性能好。介绍了以ADSP-21992芯片为主控芯片的井下视频信号采集系统设计。该系统主控芯片内嵌CAN控制器,与相关元器件组成CAN接口单元,搭载EILog-06测井系统的遥传短节,实现对井下图像数据的采集和传输。给出了系统的硬件设计和软件设计,并用串口摄像头进行了测试验证。     

基于FPGA的视频图像采集与显示系统设计

针对CCD摄像头输出的模拟CVBS信号数据量大和现场可编程门阵列FPGA并行处理能力强的特点,提出了一种CCD摄像头+FPGA+ SDRAM+视频编解码芯片的采集与VGA显示系统设计方案.按照视频信号的处理过程,在FPGA中设计了I2C控制器,ITU656解码器、视频处理器、SDRAM控制器、色度空间转换模块和VGA显示模块,实现了对视频解码芯片的工作配置,视频数据的解析、处理、存储和显示.硬件验证结果符合设计要求.     

基于视频解码芯片与CPLD的实时图像采集系统

一种基于视频解码芯片与CPLD的实时图像采集系统,采用视频解码芯片SAA7114H进行A/D转换,在CPLD芯片XC95216的逻辑控制下通过乒乓缓存技术进行数据存储。     

Linux平台高速雷达视频采集与显示

本文分析了Linux平台基于PCI总线的雷达视频采集和显示的软硬件方案,包括采集卡的设计,Linux驱动设计和显示技术的介绍。详细讨论了方案实现的难点和细节。     

本质安全型低照度视频采集激光辅助光源设计

针对现有低照度视频采集辅助光源存在功耗高、体积大、照射距离近、隐蔽性差等问题,提出了一种本质安全型低照度视频采集激光辅助光源设计方案。选用光源波长为940nm的半导体激光二极管,利用多模光纤、匀光片和透镜使半导体激光二极管输出光束形状规则、光照强度均匀;本质安全型驱动电路采用恒流驱动方式,具有过压、防反接和防静电保护;通过散热装置降低半导体激光二极管工作温度,使激光辅助光源能长时间稳定工作。测试结果表明,该激光辅助光源照射距离可达20m,功耗小于3 W,持续工作温度低于50℃。     

基于FPGA的高清视频采集与显示系统设计

介绍了一种基于FPGA的视频采集与显示系统的设计.系统以FPGA为核心,配合高分辨率CCD图像传感器、ADC模数转换、视频编码器等,实现了高清视频实时采集与显示.详细阐述了色彩插值与色彩空间转换算法和BURST传输的FPGA硬件实现.测试表明,该系统运行良好,能够满足高清视频实时监控要求.     

基于视频检测的高速公路交通信息采集系统设计

基于视频检测技术设计了一种实时的高速公路交通信息采集系统。系统利用图像处理技术对交通视频进行实时分析,能有效地获取车流量、车速、道路占有率等基本交通信息。现场测试结果表明,该系统具有很好的实时性和可靠性。     

基于Linux+ARM的多格式视频图像采集系统的设计

设计了基于S3C2440微处理器的视频图像采集系统,详细分析了该系统的启动过程。在一块裸板上搭建起整个视频图像采集系统。结合V4L2技术完成了支持YUV、MJPEG图像格式的USB摄像头和支持RGB图像格式的CMOS摄像头的多格式视频图像采集系统。测试结果表明,该系统可以在LCD显示屏上动态显示多格式摄像头所采集到的视频图像,且视频图像具有清晰度高、流畅性好、稳定性强等特点,具有进一步推广使用的广阔前景。     

Personalized retrieval of sports video based on multi-modal analysis and user preference acquisition

In this paper, we present a novel framework on personalized retrieval of sports video, which includes two research tasks: semantic annotation and user preference acquisition. For semantic annotation, web-casting texts which are corresponding to sports videos are firstly captured from the webpages using data region segmentation and labeling. Incorporating the text, we detect events in the sports video and generate video event clips. These video clips are annotated by the semantics extracted from web-casting texts and indexed in a sports video database. Based on the annotation, these video clips can be retrieved from different semantic attributes according to the user preference. For user preference acquisition, we utilize click-through data as a feedback from the user. Relevance feedback is applied on text annotation and visual features to infer the intention and interested points of the user. A user preference model is learned to re-rank the initial results. Experiments are conducted on broadcast soccer and basketball videos and show an encouraging performance of the proposed method.

基于FPGA的实时视频图像采集处理系统设计

针对目前数字图像采集处理技术的实时性、大容量、小型化等特点,设计了一种基于FPGA的实时视频图像采集处理电路系统。采用FPGA作为整个系统的控制和图像数据处理中心。DDR2 SDRAM为高速储存模块核心器件,CMOS 7670为视频图像采集器件。并通过Quratus Ⅱ和Modelsim等软件对系统的边缘检测算法、控制过程、各个模块等进行硬件工程设计和仿真,实现了视频图像从采集、存储到处理、显示的整个过程。实验表明,视频图像采集处理的动态画面流畅、清晰、实时性好。     

Civil engineering supervision video retrieval method optimization based on spectral clustering and R-tree

Neural Computing and Applications - The civil engineering supervision video provides the effective method to improve the quality of civil engineering supervision, but its usual retrieval by...     

Geo-data acquisition through mobile GIS and digital video: an urban disaster management perspective

For the management of urban disaster risk, periodic updating of building and lifeline geo- databases is crucial, particularly in developing countries where urbanisation rates are very high. However, collecting information on the characteristics of buildings and lifelines through full ground surveys can be very costly and time-consuming. Research into more cost-effective surveying alternatives should be therefore high on the agenda.This paper explores the use of an off-the-shelf low-cost and rapid method of data collection for the development of a building inventory based on the combination of remote sensing (RS), global positioning systems (GPS), digital video (DV) and geographic information systems (GIS). The method developed consists of a sequence of stages, the first stage involves the use of RS and GIS for stratification and mission planning purposes. The second stage consists of using GPS and DV for the creation of spatially referenced images and the third stage involves the use of GIS for display and analysis. The methodology developed was tested on the Costa Rican city of Cartago and its advantages and disadvantages identified.     

基于LabWindows/CⅥ的傅里叶变换光谱测量的数据采集系统

介绍一种基于LabWindows/CVI的光谱测量数据采集系统,利用LabWindows/CVI的编程优势,提高了编程效率与光谱仪数据分析的处理能力.给出了傅里叶变换光谱测量方法的设计原理、硬件系统构成以及LabWindows/CVI软件数据采集系统,包括实现干涉图数据采集、实时显示、数据分析处理和光谱分辨率的精确计算等功能.实验结果证明该系统满足设计需求.