山区公路驾驶视觉信息量计算方法研究

为解决山区公路中驾驶视觉信息量难以量化的问题，对驾驶视野图像进行分割，根 据HSV颜色模型，提取视野图像的色调、饱和度、亮度值，再结合车速值，在驾驶视觉心理负荷的基础上，提出山区公路路域环境下的驾驶视觉信息量计算方法.通过实车实验，进行数据采集，并验证计算方法.计算结果表明，在半郁闭型空间行驶时，接收的视觉信息量最大；在郁闭型空间中，接收的信息量最小.计算结果与被试实际感受具有一致性，说明本文提出的驾驶视觉信息量计算方法具有可行性，可为路域环境的合理布设提供一定的技术参考.     

A statistical analysis of consumer perceptions towards automated vehicles and their intended adoption

ABSTRACT

While automated vehicle (AV) development continues to progress rapidly, how the public will accept and adopt automated vehicles remains an open question. Using extensive survey data, we apply cluster analysis to better understand consumer perceptions toward potential benefits and concerns related to AVs with regard to factors influencing their AV adoption likelihood. Four market segments are identified – ‘benefits-dominated,’ ‘concerns-dominated,’ ‘uncertain,’ and ‘well-informed.’ A random parameters multinomial logit model is then estimated to identify factors influencing the probability of respondents belonging to one of these four market segments. Among other influences (such as socio-economic and current travel characteristics), it is found that ‘Millennials’ have a higher probability of belonging to the well-informed market segment, ‘Gen-Xers’ with a lower probability to the uncertain market segment, and ‘Baby Boomers’ with a higher probability to the concerns-dominated market (relative to the ‘Great Generation’). We also study the individuals’ expressed likelihood of AV adoption using separate random parameters ordered probit estimations for each of the four market segments. The substantial and statistically significant differences across each AV consumer market segment underscore the potentially large impact that different consumer demographics may have on AV adoption and the need for targeted marketing to achieve better market-penetration outcomes.     

青藏铁路综合视频监控系统室外摄像机抖动频率特征分析

青藏铁路沿线多处区段常年多风,导致安装在铁塔高处的长焦摄像机产生抖动引起图像模糊,因此使用的长焦摄像机应具有防抖功能。而多个摄像机、镜头等生产厂家,均无法提供其电子防抖性能的具体参数指标,或无法给出光学/机械防抖性能参数指标来源。通过提出采用SURF算法提取匹配图像的特征点,介绍算法原理和算法实现过程,并开展算法验证和试验分析,得出大风天气条件下,青藏铁路沿线室外摄像机主要抖动频率区间为2~10 Hz。研究成果对标定摄像机的防抖性能指标具有重要参考意义。     

Large-scale transit market segmentation with spatial-behavioural features

Transit market segmentation enables transit providers to comprehend the commonalities and heterogeneities among different groups of passengers, so that they can cater for individual transit riders’ mobility needs. The problem has recently been attracting a great interest with the proliferation of automated data collection systems such as Smart Card Automated Fare Collection (AFC), which allow researchers to observe individual travel behaviours over a long time period. However, there is a need for an integrated market segmentation method that incorporating both spatial and behavioural features of individual transit passengers. This algorithm also needs to be efficient for large-scale implementation. This paper proposes a new algorithm named Spatial Affinity Propagation (SAP) based on the classical Affinity Propagation algorithm (AP) to enable large-scale spatial transit market segmentation with spatial-behavioural features. SAP segments transit passengers using spatial geodetic coordinates, where passengers from the same segment are located within immediate walking distance; and using behavioural features mined from AFC data. The comparison with AP and popular algorithms in literature shows that SAP provides nearly as good clustering performance as AP while being 52% more efficient in computation time. This efficient framework would enable transit operators to leverage the availability of AFC data to understand the commonalities and heterogeneities among different groups of passengers.     

钢轨断面图形信息自动获取系统

本文以铁道钢轨断面图形检测为实例,设计了一个光学图象信息采集系统。把强光带直接照射到钢轨轨顶及其两侧,将一对CCD摄象机获取的三维物体的图象信息,经图象预处理后,用线性内插法对光带细化,使其变为二维图象处理,从而不再涉及难度较大的立体象对的图象相关问题。     

微创手术机器人视觉定位系统的研究

根据立体视觉的基本原理，建立摄像机标定模型和立体视觉模型，设计了基于微创手术机器人的视觉定位系统．介绍了相应图像处理软件的设计，实现对目标的准确识别和精确定位．实验证明该方案有较好的定位效果，同时分析了引起误差的原因．     

英汉成语翻译中形象语言的处理

英汉两种语言中都存在着大量的形象语言,而形象语言是语言修辞手段的重要组成部分。本文从英汉成语中形象语言的来源,形象语言在翻译中的处理着手,探讨其内在的文化内涵及如何结合语境、语篇灵活地进行形象语言的翻译。     

一种基于视频虚拟检测线的交通流参数检测方法

实时交通流参数检测在智能交通系统中起着重要的作用。参数检测有多种方式,其中基于图像处理的视频车辆检测方式近年来发展很快,由于它具有检测区域大、系统设置灵活等突出的优点,已成为智能交通系统领域的一个研究热点。车辆的检测基于车道,在每个车道设置两条虚拟检测线来检测交通流参数,虚拟检测线的作用类似于电磁感应线圈。系统通过对视频虚拟检测线的预处理将二维的数字图像转化成一维的检测信号,减小了运算量,降低了运算负荷。提出的基于视频虚拟检测线特征的交通流参数检测系统已经在PC机上用VC 6.0实现,并对不同典型天气条件下的交通流视频进行了实验,实验结果表明该系统具有较高的车流量统计精度。     

基于小波域隐马尔可夫树模型的多光谱遥感影像纹理分割技术研究

遥感图像纹理信息丰富，需要进行有效的纹理特征描述．小波域隐马尔可夫树（HMT）模型提供了一种有效的纹理特征提取方法．简述了HMT模型及分割思想，并在此基础上针对多光谱遥感图像，探索更好的纹理描述方法．通过适当的数学变换，得到多光谱遥感影像在不同角度下的描述：H—S—I分量和最大主成分分量．研究比较各分量特性并应用HMT模型，得到不同分量下纹理分割结果．实验表明，利用多光谱信息可有效地提高分割质量。     

MEDICAL IMAGE SEGMENTATION BASED ON A MODIFIED LEVEL SET ALGORITHM

Imagesegmentationplaysanimportantrolein imageanalysisaswellasinhigh levelimageinter pretationandunderstandingsuchasrobotvision, objectrecognition,andmedicalimaging.Numerous segmentationmethodshavebeendeveloped.How ever,medicalimagesareoftencorruptedbyno…