基于ADI DSP的高速公路背景建模技术研究与实现

【作者】 孟晓琳；

【导师】 黎英；

【作者基本信息】 昆明理工大学 ， 测试计量技术及应用， 2011， 硕士

【摘要】 视频检测系统可以实时地收集交通信息数据,以其安装维护便捷、检测面积广等独有优势,逐渐成为了车辆检测领域的主流技术之一。目前,视频车检有几种经典算法,其中背景差法是检测运动目标的有效方法之一。该方法是通过视频当前帧与背景帧进行差分进而得到运动前景,其检测质量主要取决于背景模型的性能。本文以视频检测系统中的背景建模部分为研究对象,对高速公路背景建模和硬件实现方面进行了研究,在BF 548 DSP评估板上开发了背景建模系统的原型。在背景建模方面,首先将典型背景建模算法进行对比,并对高速公路视频像素点的灰度特征进行分析总结。然后,以码本方法作为背景建模算法的基础,并对其加以改进。最后,对感兴趣区域进行设置,完成了基于概率统计的背景建模及其更新算法。实验表明,在较少的内核资源使用前提下,该算法拥有较好的背景提取效果,为视频检测系统的后续工作提供了有力的保障。在硬件实现方面,本文首先分析了当前主流视频检测系统的硬件实现方法。其次,根据背景建模软件算法及其今后拓展的需求,选用BF 548 DSP评估板作为系统的硬件开发平台。然后,将计算机视觉库OpenCV的部分程序移植到BF 548 DSP平台上,并根据Blackfin系列处理器的特点对程序进行优化。最后,在BF 548 DSP评估板上实现了背景建模以及与上位机通信功能。实验结果表明,本文的背景建模系统在满足一定条件下能够准确、实时地对视频进行背景建模,基本达到预期效果。更多还原

【Abstract】 Video detection system can collect traffic information data on real-time. Because it has some unique advantages such as easy installation and maintenance and the area of testing is wide, video detection system has become to mainstream technique of the field of vehicle detection. At present, there are several classical algorithms for video detection system. Among them, the background subtraction method is an effective way to detect moving targets. This method get moving foreground through the current frame minus the background frame. The quality of test performance depends on background modeling.The background modeling of the video detection system is used as study object in this paper. Background modeling of highway and its hardware was studied. The prototype of background modeling system was developed on the BF548 DSP evaluation board.In terms of the background modeling, typical algorithms of background modeling and characteristics of highway were analyzed and summarized. Then, the codebook modeling was used as the basis of the background modeling algorithm and improved. Finally, probability and statistics background modeling and updating algorithms is completed with setting the region of interest. Experiments show that the algorithm could extract background well on using resources of kernel less. That provided a strong guarantee for follow-up the work of video detection system.In terms of hardware implementation, mainstream hardware implementation of video detection system is analyzed first. Based on the needs of software algorithm of background modeling and future expansion, the BF 548 evaluation board was selected to achieve the algorithm. Then, the parts of the OpenCV were ported to the BF 548 DSP platform. The programs were optimized based on the characteristics of Blackfin family of processors. Finally, achieve to run background modeling algorithm and communication with the host computer on the BF 548 DSP evaluation board. The experimental results show that the background modeling system can accurately get the background in real time under certain conditions. Those achieve the desired effect.更多还原