一种利用Matlab提取图像中曲线的新方法

为方便、准确地将数字图像中的曲线图转换为可以被计算机识别的、便于随时调用的曲线数据,论文提出一种基于图像处理技术提取图像中曲线数据的新方法,并利用Matlab编写出GUI程序.这种方法通过对图像进行灰度变换、二值变换、形态学运算的细化和重构,将数字图像中的曲线图提取出来,同时将曲线的数据（即曲线上点的坐标）以数组的形式保存为Matlab数据文件.之后即可在Matlab中通过插值法得到曲线上任意一点的值.     

汽车平面显示器计算机视觉检测系统

现代汽车上广泛采用了平面显示器显示一些驾驶信息,对其逻辑显示状态必须进行视觉检测.本研究采取了基于VB和VC图像处理的方法设计测试系统.该系统利用CAN总线通讯模块实现平面显示器的控制,利用摄像头采集图像,并把采集到的图像和标准图片比对.从结果来看,产品的测试正确性在99.8%以上,实践证明此方法实现了对平面显示器的快速自动化检测,是一种行之有效的方法.     

基于车载图像传感器的汽车跑偏自动测试研究

为了满足企业准确判定下线车辆的跑偏量是否符合相关标准要求,设计了一套基于车载图像传感器的汽车行驶跑偏自动测试系统。利用Matlab图像处理平台,对图像进行预处理、车道中心线边缘检测及道路拟合,提取车道线特征点的位置坐标,基于坐标转换和跑偏模型,确定被试车辆在测试区域的行驶跑偏量。实际应用表明,该系统安装调试方便,自动化程度高,测量精度高,实时性强,同时也达到了模块化的要求,方便集成,系统运行平稳,更能满足企业测试要求。     

基于机器视觉的细长产品表面缺陷检测设备研究

为提高对细长产品表面缺陷的检测效率,运用机器视觉技术对细长产品外部轮廓尺寸及表面缺陷状况进行检测.运用机器视觉技术,分析图像传输过程中噪声产生原因及降噪方法;采用canny算法和Simple Blob Dectorte特征点检测方法,提取零件轮廓和色斑轮廓;编写基于机器视觉的表面缺陷检测程序,并通过实验验证了该方法的可行性.采用系统法对表面缺陷检测设备进行整体分析,设计出与检测程序相配套的机械设备.     

基于OpenCV的相机显示研究与实现

生产企业在解决生产自动化的问题后,开始寻求以机器视觉为基础的检测自动化和装配自动化,机器视觉技术早已成为工业界关注的热点之一。针对项目需求搭建嵌入式机器视觉平台,使用了BASLER相机和Odroid-XU4开发板,操作系统为Linux,提出了一种结合Qt和OpenCV工业相机显示实现方法,软件开发平台为Qt Creator。最后对开发程序进行了运行测试,实验结果表明:此方法能较好驱动相机显示图像,此外在Linux下进行设计满足了基于嵌入式操作系统的应用需求。     

可编程逻辑控制器通用开发平台的设计与实现

介绍可编程逻辑控制器（PLC）通用开发平台的设计与实现方法.该平台遵循IEC61131-3标准,基于Windows用VC＋＋设计,用于实现PLC控制系统硬件配置、PLC控制程序设计、梯形图与指令表程序间的相互转换、程序调试、仿真运行、网络通信与实时监测等,是设计实现PLC控制系统必备的通用集成环境与实时监测受控现场状况的工具.本文重点研究了PLC控制系统的组态与控制程序可执行代码的实现方法,提出了基于图和二叉树的梯形图与指令表程序的转换算法.研究表明,该平台对控制系统的组态设计、PLC控制程序编制及控制流程的通用转换算法等特点,特别适用于逻辑关系复杂的自动化监控系统的设计与开发.     

基于DM6437的接插件产品在线检测系统的研究

接插件产品检测是接插件生产的重要环节,传统的检测方法依然采用人工检测.文中根据接插件产品针脚的特点,提出了一种基于DSP的在线检测方法,以数字信号处理器TMS320DM6437为图像处理核心,CCS 3.3为软件开发平台,提出了采用中值滤波、自适应阈值二值化等预处理获取接插件产品的有效图像信息,并根据接插件针脚的缺陷特征,设计了一种高效、实用的直线检测方法.提高检测速度和效率,搭建系统平台.最后,实验分析和比较了应用效果.     

基于O型密封圈尺寸的检测方法

以机械密封中任选的一种O型密封圈为研究对象,使用高清摄像机获取其图像,采用数字图像处理技术对图像进行分析,提取出密封圈的几何特征,即密封圈的内径和外径,再使用有效的图像测量方法检测该0型密封圈的缺陷以及提取其尺寸.文章具体设计讨论了密封圈直径检测的方法,为工业上对密封圈缺陷及直径的实时检测提供了依据.以上图像的处理均在Matlab7.0的环境下实现.     

基于PLC的绕线机自动控制系统

介绍了绕线机自动控制系统的设计过程。设计中采用可编程序控制器实现了线圈圈数检测和脉冲输出频率控制,文本显示器用于参数显示,变频器作为主轴电机控制器,用步进驱动器和步进电机进行线圈线径选择控制,实现了绕线机绕线过程的自动化,提高了生产效率。     

基于机器视觉的封印产品防伪条码在线检测系统

本文介绍了应用机器视觉技术开发的封印产品防伪条码在线检测系统,采用虚拟仪器开发平台LabVIEW完成系统的软件开发,实现了封印产品条码的在线自动化检测及顺序检验.针对检测环境中光照不均对识别率的影响,本文提出了一种基于ROI分割的相机增益智能调节方法,有效提高了在单次检测中不同位置的封印产品条码的识别率.实践证明该系统在识别率、效率和稳定性上均满足大批量生产的要求.     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.