共查询到19条相似文献,搜索用时 118 毫秒
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本文主要介绍了基于ARM Cortex-A8的车牌识别系统.该系统采用BeagleBone Black开发板作为主控制器,罗技C170 USB网络摄像头作为图像采集设备,微雪7寸HDMI LCD触摸屏作为显示设备.开发板运行Debian操作系统,使用Qt作为集成开发环境,调用OpenCV以及Tesseract算法库.本文设计的软件进行基于灰度化、高斯滤波、So-bel边缘检测以及OTSU二值化的预处理,采用形态学方法实现车牌定位,利用水平投影和垂直投影方法,结合中国车牌先验知识完成字符分割,最后通过Tesseract OCR引擎完成字符识别.整个系统性能稳定,识别准确率高,适用于大多数车牌识别的场景. 相似文献
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在智能交通环境中,车牌识别是其重要的工作内容,弱光车牌图像识别在嵌入式设备上的实现具有重大挑战.论文结合图像增强算法和图像识别算法,将训练好的算法模型在树莓派开发板上应用实现弱光车牌图像的识别.该模型将U-Net卷积网络作为图像增强处理部分的核心网络,利用LPRNet算法进行车牌图像识别.与HSV、BP和LeNet-5... 相似文献
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基于Linux和YP2440开发板制作嵌入式视频监控系统根文件系统。使用busybox制作/bin,/linuxrc,/sbin,/usr等目录,选用开发板的库文件来作为嵌入式系统的库文件。视频监控系统主要由无线网卡和摄像头等组成。实现服务器视频采集。 相似文献
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面部识别技术具有人脸信息实时持有、无需记忆或携带、非接触方式采集的特点。基于人脸识别的门禁系统以Samsung S3C6410嵌入式开发板为硬件平台,采用普通摄像头作为人脸图像采集设备,7寸LCD液晶显示触摸屏作为输入,由开发板加载的GPIO控制口及电子门锁组成。软件以嵌入式Linux为操作系统,设计并优化人脸识别算法,减少光照对识别的干扰,通过人脸库训练算法和人脸识别算法的软件运行,实现了人脸识别门禁系统的控制功能。本系统适用于近距离人脸识别,实行人员注册登记,具有多次使用的安防功能,具有非接触性、数据易采集、处理器功耗少、节省电能、成本低廉、便于安装、性能稳定的特点。 相似文献
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本文对传统的以通用数字信号处理器(DSP)为核心的车牌识别系统进行了改进,介绍了一种新的基于FPGA车牌识别系统。该系统主要通过摄像头采集汽车车牌图像,经过FPGA核心处理器对图像进行处理,识别出车牌号,并通过LCD显示。经过调试运行,该系统实现了车牌识别的功能,可运用于工程实践。 相似文献
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针对嵌入式环境下车牌识别的问题,本文提出了一种基于多特征和加权模式相似性测度的车牌字符识别方法。首先获取车牌字符的结构、轮廓与笔划等多特征信息,建立车牌字符编码表;然后利用加权模式相似性测度进行特征匹配,完成字符识别。该方法不需要样本和模板,占用资源少,运算效率高,可以满足嵌入式环境下车牌识别对资源和效率的要求。实验表明,该方法鲁棒性好、识别率高。 相似文献
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针对嵌入式环境下车牌识别的问题,本文提出了一种基于多特征和加权模式相似性测度的车牌字符识别方法。首先获取车牌字符的结构、轮廓与笔划等多特征信息,建立车牌字符编码表;然后利用加权模式相似性测度进行特征匹配,完成字符识别。该方法不需要样本和模板,占用资源少,运算效率高,可以满足嵌入式环境下车牌识别对资源和效
效率的要求。实验表明,该方法鲁棒性好、识别率高。 相似文献
效率的要求。实验表明,该方法鲁棒性好、识别率高。 相似文献
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针对如何在复杂背景、拍摄角度和车牌尺度发生变化等少约束条件下实现基于字符组合词包模型的车牌定位算法。本文首先构造包含车牌数字字符和英文字符的数据库;然后利用本算法识别提取车牌字符的SIFT特征,并精准计算识别特征点在字符识别区域的相对位置、物理方向等信息组成视觉识别词汇;最后把本车牌字符的视觉词汇聚合后搭建车牌字符视觉词包数据库。在识别阶段,提取待识别图像SIFT特征与视觉词包中的视觉词汇进行匹配,并聚合所有有效投票位置来实现车牌区域的准确识别定位。仿真结果表明,本文算法对于背景复杂下的车牌区域定位具有较好的效果。 相似文献
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Yo-Ping Huang Chien-Hung Chen Yueh-Tsun Chang Frode Eika Sandnes 《Expert systems with applications》2009,36(5):9260-9267
License plate recognition techniques have been successfully applied to the management of stolen cars, management of parking lots and traffic flow control. This study proposes a license plate based strategy for checking the annual inspection status of motorcycles from images taken along the roadside and at designated inspection stations. Both a UMPC (Ultra Mobile Personal Computer) with a web camera and a desktop PC are used as hardware platforms. The license plate locations in images are identified by means of integrated horizontal and vertical projections that are scanned using a search window. Moreover, a character recovery method is exploited to enhance the success rate. Character recognition is achieved using both a back propagation artificial neural network and feature matching. The identified license plate can then be compared with entries in a database to check the inspection status of the motorcycle. Experiments yield a recognition rate of 95.7% and 93.9% based on roadside and inspection station test images, respectively. It takes less than 1 s on a UMPC (Celeron 900 MHz with 256 MB memory) and about 293 ms on a PC (Intel Pentium 4 3.0 GHz with 1 GB memory) to correctly recognize a license plate. Challenges associated with recognizing license plates from roadside and designated inspection stations images are also discussed. 相似文献
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胡泽 《计算机与数字工程》2012,40(3):100-101,120
介绍了一种基于TMS320DM6437硬件平台,运用数字图像处理的知识来实现汽车车牌的自动识别功能。对目前使用的车牌预处理、车牌定位技术与字符分割等算法进行了实验分析。 相似文献
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M. S. Sarfraz A. Shahzad Muhammad A. Elahi M. Fraz I. Zafar E. A. Edirisinghe 《Journal of Real-Time Image Processing》2013,8(3):285-295
We propose an efficient real-time automatic license plate recognition (ALPR) framework, particularly designed to work on CCTV video footage obtained from cameras that are not dedicated to the use in ALPR. At present, in license plate detection, tracking and recognition are reasonably well-tackled problems with many successful commercial solutions being available. However, the existing ALPR algorithms are based on the assumption that the input video will be obtained via a dedicated, high-resolution, high-speed camera and is/or supported by a controlled capture environment, with appropriate camera height, focus, exposure/shutter speed and lighting settings. However, typical video forensic applications may require searching for a vehicle having a particular number plate on noisy CCTV video footage obtained via non-dedicated, medium-to-low resolution cameras, working under poor illumination conditions. ALPR in such video content faces severe challenges in license plate localization, tracking and recognition stages. This paper proposes a novel approach for efficient localization of license plates in video sequence and the use of a revised version of an existing technique for tracking and recognition. A special feature of the proposed approach is that it is intelligent enough to automatically adjust for varying camera distances and diverse lighting conditions, a requirement for a video forensic tool that may operate on videos obtained by a diverse set of unspecified, distributed CCTV cameras. 相似文献
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E. N. Vesnin A. E. Mikhailov V. A. Tsarev P. S. Cherkas 《Pattern Recognition and Image Analysis》2012,22(3):406-411
Smart Camera is an adaptive optoelectronic system intended for recognizing automobile numbers. The system consists of a digital camera with an IR illuminator and IR filter combined with a PC-compatible computing module. In real-time mode, the illumination of a license plate of an automobile is analyzed in frames that arrive from the camera, after which the parameters of the camera are changed to reach the optimal illumination of the license plate of an automobile. The built-in computing module analyzes images and produces control decisions. The numbers are also recognized in the smart camera. Video and recognition results are transmitted via the network. 相似文献