一种新的车牌字符分割预处理方法

字符分割是车牌识别中关键的一步。但在实际处理中,预处理的不足常常给字符分割带来很大难度,甚至导致分割的失败。在对车牌字符分割前的预处理方法进行了研究之后,提出了新的预处理方法,该方法包括反色判断、局部二值化、倾斜校正、车牌精确定位以及顶帽算法滤波等步骤。     

车牌照识别系统设计

车牌自动识别系统可以分为图像采集、图像预处理、车牌定位、车牌预处理、字符分割、字符识别几大部分.每个模块即相互关联的,又有其自身的特点和技术.车牌定位是车牌识别的基础,本文采用水平和垂直的车牌定位算法;车牌字符的分割是进行单个字符识别的前提,本文采用一种垂直投影的字符分割方法;字符识别采用了BP神经元网络的方法.     

车牌识别系统中字符分割技术研究

车牌识别LPR是智能交通中关键技术之一.字符分割是车牌识别的基础.但是,现实应用中,复杂背景、字符断裂或字符粘连等因素容易导致车牌字符分割失败.本文提出了一种新的字符分割方法--基于全局约束的字符分割算法,有效的解决了这些复杂的问题.本算法已在软件平台上成功实现,并使用大量从各种不同环境下采集的具有代表性的车辆图像作为算法测试数据源对算法进行测试,结果证明这种车牌字符分割算法的准确率得到了很大的提高.     

基于几何特征的车牌识别系统关键技术研究

车辆牌照是机动车身份识别的唯一标志,在目前的交通管理、智能监测等领域发挥着无可替代的作用。研究首先用数学形态学的方法对获取的车牌图片进行预处理,其次利用车牌区域矩形结构与面积值固定的几何特征实现车牌准确定位,最后再根据车牌内字符间间隔大,不会出现字符粘连且每个字符长度固定可设定阈值的几何特征得到车牌字符的精确分割。设计在Matlab实验仿真平台上完成,实现了车牌识别系统的三个关键环节。与之前的研究相比,实验结果表明所用的数学方法突出车牌定位的准确性和字符分割的精确性。     

基于车牌识别的图像预处理研究

车牌识别包括车牌图像的预处理、车牌定位、字符分割和字符识别等重要的部分。其中车牌图像预处理的优劣直接决定着车牌定位识别准确性的高低。该文列举了图像预处理的优化方法和步骤,针对全局阈值的二值化算法进行了改进。实验的仿真结果很好地验证了改进算法的性能。     

一种车牌识别系统的设计与实现

提出一种基于Android系统的车牌识别系统,通过车牌识别预处理、车牌定位、字符分割与识别对车牌识别算法进行深入研究后提出具有较好容错性、鲁棒性的车牌识别算法,通过参考相关系统设计,利用VC++进行设计。     

不定长车牌字符分割算法

车牌号码识别包括牌照定位,字符分割,字符识别三个主要过程。字符分割是在牌照定位后把字符从牌照中分割出来的过程,然后送到字符识别系统识别。本文提出的字符分割算法在传统的垂直投影法字符分割的基础上进行了改进,对于字符个数不定、车牌字符之间有大间隔的车牌也取得了理想的字符分割效果。     

一种基于汉字结构特征的车牌照字符分割方法

提出了一种基于汉字结构特征的车牌照字符分割方法.该方法首先找到汉字的主体部件,然后根据汉字上下、左右、包围结构找到组成汉字的其它部件,并结合汉字识别结果对分割得到的汉字进行确定.最后,根据车牌字符串的结构特征找到其它字符.特殊车牌图像,要对字符和字符、字符和边界粘连的情况进行分裂,对部分字符进行合并.而且本方法还可以对定位出现车牌字符丢失情况进行重新定位,找到丢掉的字符.对大量车牌图像字符的分割,试验结果证明,该方法能够达到准确分割出车牌图像中字符的目的.     

基于图像处理的车牌识别系统的研究与实现

主要对车牌识别系统进行了功能性的研究和实现。车牌识别系统是制约道路交通智能化的重要因素,主要包括图像采集、图像预处理与图像识别3部分。首先通过照相设备采集照片,然后对采集的图片进行预处理,包括灰度化、二值化、梯度锐化、降噪、分割图片、归一化等,再对分割出的字符用模板匹配法进行识别。     

MATLAB在汽车牌照图像处理识别系统中的应用

汽车牌照识别系统是交通管理领域和数宇图像处理领域里的热点问题。本文介绍了MATLAB在汽车牌照图像处理识别系统中的应用。该系统实现了汽车牌照的字符分割。分割准确率高、速度快。整个处理过程分为预处理、边缘提取、车牌定位、字符分割、字符识别五大模块,通过调用MATLAB函数来实现每一个部分处理过程,最后识别出汽车牌照。     

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...     

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。     

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.     

Fractional order nonsingular terminal sliding mode control for flexible spacecraft attitude tracking

This paper investigates a fractional terminal sliding mode control for flexible spacecraft attitude tracking in the presence of inertia uncertainties and extern...     

奥氏体不锈钢表面双辉等离子渗锆的动力学

利用双辉等离子渗金属技术在0Cr18Ni9Ti奥氏体不锈钢表面制备了一层均匀、致密、呈良好冶金结合的渗锆合金层,并对1 060℃下的渗锆动力学进行了研究。结果表明:随着距锆合金层表面距离的增加,锆元素的含量呈梯度递减,扩散系数逐渐减小,而扩散激活能逐步增大;在1 060℃采用双辉等离子技术渗锆时,渗锆合金层表层的空位密度为2.945×(1012~1013)cm-2,与相同温度下采用常规渗金属工艺相比,提高了1~2个数量级。     

气化炉三维扫描测量与数据处理

以德士古气化炉耐火砖的内壁蚀损检测设备为基础,对采集到的点云数据做了进一步处理.通过对数据的筛选和剔除,实现了数据点的平滑降噪细化和精简.然后利用点云对整、网格划分和分色显示等方法,最终完成了内壁腐蚀情况的三维建模.重点讨论了点云数据的预处理及后处理的方法,并根据内壁耐火砖的腐蚀阈值,提出了一种气化炉内壁腐蚀区域的识别与分割方法.对耐火砖的腐蚀分析、气化炉的生产与维修提供了可靠依据,并在工程应用中获得了一致认可.