共查询到20条相似文献，搜索用时 31 毫秒
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For the realtime classification of moving vehicles in the multi-lane traffic video sequences, a length-based method is proposed. To extract the moving regions of interest, the difference image between the updated background and current frame is obtained by using background subtraction, and then an edge-based shadow removal algorithm is implemented. Moreover, a thresholding segmentation method for the region detection of moving vehicle based on location search is developed. At the estimation stage, a registration line is set up in the detection area, then the vehicle length is estimated with the horizontal projection technique as soon as the vehicle leaves the registration line. Lastly, the vehicle is classified according to its length and the classification threshold. The proposed method is different from traditional methods that require complex camera calibrations. It calculates the pixel-based vehicle length by using uncalibrated traffic video sequences at lower computational cost. Furthermore, only one registration line is set up, which has high flexibility. Experimental results of three traffic video sequences show that the classification accuracies for the large and small vehicles are 97.1% and 96.7% respectively, which demonstrates the effectiveness of the proposed method. 相似文献
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车辆检测是智能交通系统（ITS）的核心。探讨采用自适应算法对背景进行实时更新的方法,能有效削弱恶劣天气和环境变化在画面上产生的各种噪声。实验表明此方法具有很好的实时性,能满足视频车辆检测的要求。还探讨了一种在堵车的复杂环境下背景的实时更新算法,用前景静止物体表面灰度值的变化量,来估算背景的改变量,从理论上解决停车及车辆缓行条件下的背景更新问题,达到扩展背景差法通用性的问题。 相似文献
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文中提出了一种基于小波分析的车牌定位算法．根据图像中车牌的形态特征和横向纹理属性,提取图像高频（LH）小波系数的均值、能量、熵等作为分类特征,同时通过形态学算法对车牌候选域和非车牌域进行聚类,并运用相关的先验知识对车牌候选域进行优化．实验结果表明,文中提出的车牌定位算法是一种切实可行、准确高效的方法,该算法对复杂背景下拍摄的汽车图像具有很好的鲁棒性． 相似文献
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在交通收费和路口监控等车牌识别应用中,纯粹依靠PC机通常难以达到实时性,应用受到了限制.在将DSP引入到车牌识别应用系统后,此问题可得到较好解决.本DIP系统以TIC6201 DSP处理器为核心,配王S从7111A视频解码芯片SAA7111A作为图像输入通道,使用PCI2040实现了DSP以PCI接口方式与PC的通信.在此系统中,DSP运行识别算法,然后将识别结果通过PCI接口传输给PC供PC进行显示和管理.整个系统计算分布合理,实时性强,极大提高了实用性. 相似文献
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陈炳煌 《福建工程学院学报》2020,(1):57-62
针对车辆辅助驾驶系统中遇到的障碍物小的特点和对实时性的高要求,提出一种基于卷积神经网络YOLO图像检测算法优化并增加分类计数的方法。通过对小石子和道路坑洞这2种极易引发车辆事故的典型小型障碍物图像建立数据库,针对数据库利用k-Means+优化k值并配置新的锚定值,对取自车载视频的图像进行检测识别。新增的分类和计数算法可快速、直观地获得检测结果,实现驾驶员快速决策的目标。实验结果表明,该方法可对小石子和道路坑洞等小型障碍物有效地检测识别和分类计数,检测速度也满足系统的实时性要求。 相似文献
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Implementing VLPR systems based on TMS320DM642 总被引：1，自引：0，他引：1
This paper gives a practical schema for using DSP boards to construct Vehicle License Plate Recognition (VLPR) modules that could be embedded in any Intelligent Transportation System (ITS). Using DSP can avoid the heavy investment in dedicated VLPR system and improve the computational power compared to PC software environment. Low cost, high computational power, and high flexibility of DSP provide the License Plate Recognition System (LPRS) an excellent cost-effective solution to execute the major part of the recognition tasks. This paper describes a successful implementation of VLPR system based on Texas Instruments (TI)'s TMS320DM642. The DSP board acquires video (which could be output to a monitor for surveillance) from a camera, captures images from the video, locates and recognizes the license plates in images, and then sends the recognized results and related images after compression to a host PC through the network. Finally, the overall software is optimized according to the features of DM642 chip. Experiments showed that the DSP VLPR system performs well on the local license plates, and that the processing speed and accuracy can meet the requirement of practical applications. 相似文献
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设计开发了一种新型KTV视频合成机顶盒系统。该系统采用全新的DSP技术,对音视频进行采集、合成,利用抠像技术进行人像采集,使视频、音频、动态背景、动态前景、人物等有机地结合。该研究给出了基于高性能DSP双路视频处理器的KTV机顶盒软硬件实现方案,研制了基于DSP视频处理器的视频实时叠加算法、实时抠像处理算法和异型窗口变形算法,并给出了该系统的使用效果示例。 相似文献
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视频监控系统中大量部署的摄像头为监控系统的运维工作带来巨大挑战。提出了一种基于嵌入式DSP处理器的智能视频质量诊断方案,通过对图像的分析能够自动检测视频信号丢失、图像亮度异常、图像模糊等故障并发出报警信号。 相似文献
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实时背景更新是数字视频监控中进行运动目标检测的关键技术,与基于PC的监控系统不同,嵌入式系统资源有限,难以执行复杂算法。为此提出一种帧间差分和背景减除法相结合的新方法,通过引入备份帧,有效实现了监控系统的自适应背景更新,并在嵌入式处理器DM6437上实现。实验结果表明该方法可以自动检测物体进出所引起的背景变化并进行背景更新,更新速度快,能够满足实时监控系统目标检测的需要。 相似文献
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Implementing VLPR systems based on TMS320DM6421 总被引：2，自引：0，他引：2
ZHU Le-qing ZHANG San-yuan YE Xiu-zi 《浙江大学学报(A卷英文版)》2007,8(12):2005-2016
This paper gives a practical schema for using DSP boards to construct Vehicle License Plate Recognition （VLPR） modules that could be embedded in any Intelligent Transportation System （ITS）. Using DSP can avoid the heavy investment in dedicated VLPR system and improve the computational power compared to PC software environment. Low cost, high computational power, and high flexibility of DSP provide the License Plate Recognition System （LPRS） an excellent cost-effective solution to execute the major part of the recognition tasks. This paper describes a successful implementation of VLPR system based on Texas Instruments （TI）＇s TMS320DM642. The DSP board acquires video （which could be output to a monitor for surveillance） from a camera, captures images from the video, locates and recognizes the license plates in images, and then sends the recognized results and related images after compression to a host PC through the network. Finally, the overall software is optimized according to the features of DM642 chip. Experiments showed that the DSP VLPR system performs well on the local license plates, and that the processing speed and accuracy can meet the requirement of practical applications. 相似文献
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Sobel算法在图像处理时能对边界线进行提取,突出图像的边缘。该算法不仅能够提取目标和背景的边界线,还能把两者分开,突出图像的边缘,把有用信息提取出来。把Sobel算法应用于图像处理中,并与其他算法进行对比,进行软件仿真,通过在DSP芯片上实现,可以得出Sobel算法在边缘检测方面的优势。 相似文献
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近年来,随着DSP技术的快速发展,数字视频处理技术得到了越来越广泛的应用。边缘检测是是数字视频处理中的一项关键技术,而且是进行对象检测和识别的基础。首先分析了当前发展比较成熟的几种边缘检测算法,然后针对基于DSP的数字视频处理系统的特点选用Canny边缘检测算法,并在基于DM642的数字视频处理系统上实现,给出了仿真的结果。 相似文献
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在视频序列图像中,视频图像分割的主要目的是要在视频序列中分割出运动实体,背景差法能够在实时性要求很高的情况下从一段视频中将当前帧图像跟背景图像作差,然后提取出运动目标,而对差图像进行二值化是关键,自适应阈值方法通过对差图像的直方图进行分析寻找直方图上的一个点,该点到直方图最高点与最低点之间的线段的距离最大,为求该点,本文提出了一种快速算法,以该点对应的灰度值作为阈值,这样运动目标就能够被精确地提取出来. 相似文献