Key frame extraction based on visual attention model

Key frame extraction is an important technique in video summarization, browsing, searching and understanding. In this paper, we propose a novel approach to extract the most attractive key frames by using a saliency-based visual attention model that bridges the gap between semantic interpretation of the video and low-level features. First, dynamic and static conspicuity maps are constructed based on motion, color and texture features. Then, by introducing suppression factor and motion priority schemes, the conspicuity maps are fused into a saliency map that includes only true attention regions to produce attention curve. Finally, after time-constraint cluster algorithm grouping frames with similar content, the frames with maximum saliency value are selected as key-frames. Experimental results demonstrate the effectiveness of our approach for video summarization by retrieving the meaningful key frames.     

MATLAB与Visual C++6.0混合编程的实现

针对MATLAB与VisualC^ 软件的各自编程优势，提出了一种将MATLAB中编译的，m函数文件生成可脱离MATLAB环境的动态连接库，然后在VC环境下开发应用程序界面并调用动态连接库，实现通过编译器将二者有效结合起来。     

PIC单片机与PC机串行通信的实现

PIC系列单片机作为一款外设丰富性能优良的单片机,被广泛应用于各种控制系统。在微机测控系统中,用作上位机的PC机系统与用作下位机的单片机之间经常要进行信息交换。为此提出了一种基于Visual C++的PIC18F452单片机与PC机之间串行通信的实现方法,给出了硬件电路图和通信源程序,调试实验表明,硬件设计与软件开发达到了预期的功能要求。该方法为PIC单片机与PC机间串行通信的应用提供了良好的参考。     

LED显示屏虚拟像素原理及应用

本文运用分时解析法解释了LED显示屏虚拟像素的基本原理，提出了虚拟像素的实现方法，同时分析了虚拟像素的应用要点。     

基于视觉感知的高效视频编码标准帧内量化矩阵优化方法

该文使用一种基于离散余弦变换(DCT)的调制传递函数(MTF)改进高效视频编码标准(HEVC)帧内量化矩阵,并在计算过程中采用一种新的空间频率计算方法。HEVC整数DCT变换是在DCT变换的基础上经过伸缩扩展以及微调后得到的,与DCT变换有所区别,因此针对这种差别进一步优化校正量化矩阵。仿真过程中设计一种基于结构相似性(SSIM)的Bjontegaard比特率差值(BDBR)方法来测试量化矩阵的编码性能,结果表明在相同的视频质量下,该文设计的量化矩阵能进一步降低码率。该方法在编码过程中只需要简单地改变量化矩阵,没有影响编码模型的算法结构,也不会增加编码的复杂度。     

Discriminative two-level feature selection for realistic human action recognition

Constructing the bag-of-features model from Space–time interest points (STIPs) has been successfully utilized for human action recognition. However, how to eliminate a large number of irrelevant STIPs for representing a specific action in realistic scenarios as well as how to select discriminative codewords for effective bag-of-features model still need to be further investigated. In this paper, we propose to select more representative codewords based on our pruned interest points algorithm so as to reduce computational cost as well as improve recognition performance. By taking human perception into account, attention based saliency map is employed to choose salient interest points which fall into salient regions, since visual saliency can provide strong evidence for the location of acting subjects. After salient interest points are identified, each human action is represented with the bag-of-features model. In order to obtain more discriminative codewords, an unsupervised codeword selection algorithm is utilized. Finally, the Support Vector Machine (SVM) method is employed to perform human action recognition. Comprehensive experimental results on the widely used and challenging Hollywood-2 Human Action (HOHA-2) dataset and YouTube dataset demonstrate that our proposed method is computationally efficient while achieving improved performance in recognizing realistic human actions.     

基于Visual C++和OpenGL的红外目标景象仿真研究

对红外目标的红外辐射特性进行了分析计算,提出了在Visual C++6.0环境下利用OpenGLAPI对空间目标红外辐射特性进行仿真的方法.针对假定目标给出了该目标在不同观察方向上的辐射强度并据此生成灰度图像,并利用上海技术物理研究所自行研制的128×128像素电阻阵列红外景象转换器进行了仿真实验,取得了实验结果.对红外目标的红外辐射特性仿真进行研究,为红外景象模拟提供基础.     

智能型继电保护综合测试装置的研制

采用单片机和传感器技术开发了智能型继电保护测试装置。介绍了装置的构成及工作原理,设计了一种新的控制调幅、调频、调相的数字合成电路。PC机控制软件采用VB 6.0编写,界面友好美观,可完全实现各软件模块功能。理论与实验表明:该装置是一个能自动模拟各种电压暂态波形以检验被检装置的整体动作性能的测试装置,也能准确地测试发电机的温度、转速、油耗等非电气参数。     

Visual C 中的MFC DAO编程

DAO（DataAccessObject）,是MicrosoftJet的编程界面,它提供了一个用代码来创建和操纵数据库的框架。随着社会对数据库应用需求的日益升温,DAO越来越显示出其重要性和实用性。本文介绍了用VisualC＋＋的MFC类库编写DAO程序的基本原理和方法。     

TVS-2000红外热像仪图像信息的快速处理研究

针对ＴＶＳ－２０００红外热像仪原机配置的信息处理软件不能实现实时采集、显示、处理等缺陷，研究开发了热图像数据的快速采集、存储及处理软件技术。通过ＧＰＩＢ接口在ＰＣ机与红外热像仪之间进行通信，实现了温度数据的快速连续采集；将采集存储的温度数据在计算机屏幕上显示出来，并对其进行多种处理，以利于用户获取最关心的信息。这些分析包括静态分析和动态分析。其中静态分析可以得到热图像上任意点的温度值，任意区域内的温度分布直方图，任意水平、垂直线上的温度分布剖面及其最高、最低、平均温度值；动态分析可得到任意点在给定时间段内的温度变化走势。文中介绍的新配置系统及实现的功能和软件设计方法，对于配有ＧＰＩＢ接口的智能仪器具有普遍应用价值