汽车前照灯检测技术探讨

汽车前照灯是在夜间行驶的主要照明装置,远近光形的好坏和照射方向对汽车夜间安全行驶起着重要的作用。因此,为保障机动车运行安全,应对前照灯的有关性能进行严格检验。本文就汽车前照灯远近光检测技术进行了分析。     

汽车前照灯测量误差修正系统的设计与实现

针对被测汽车的停放方位对前照灯水平照射方位角测量结果存在显著影响,提出了基于图像处理技术的汽车前照灯光束水平照射方位角测量误差的修正方法。采用摄像头摄取检测位置汽车停放区域的图像,用OTSU自适应阈值分割算法得到汽车俯视外形轮廓图像,运用逐次逼近法求出汽车摆放偏置角,对检测仪测量结果进行修正,实现测量误差的自动修正。结果表明：该修正方法能有效排除汽车停放方位偏差对测量结果的影响,提高前照灯光束水平照射方位角的检测精度。     

基于计算机图像处理技术的汽车前照灯光束照射方向检测

通过CCD摄像机将前照灯光束在汽车正前方与汽车纵向轴线垂直的 2个预定位置投影测量屏幕上的 2帧投影图像输入计算机 ,根据远、近光投影图像的特点 ,用有限邻域最大值搜索法确定远光投影图像几何中心位置 ,将近光图像转换成二值图像找出投影图像明暗截止线转角位置 ,从而确定前照灯远、近光束照射方向 .基于该方法可实现汽车前照灯远、近光束照射方向的全自动检测 ,从根本上解决目前国内各类汽车前照灯检验仪存在的问题     

基于计算机图像处理技术的汽车前照灯光速照射方向检测

通过CCD摄像机将前照灯光束在汽车正交方与汽车纵向轴线垂直的2个预定位置投影测量屏幕上的2帧投影图像输入计算机,根据远、近光投影图像的特点,用有限领域最大值搜索法确定远光投影图像几何中心位置,将近光图像转换成二值图像找出投影图像明暗截止线转角位置,从而确定前照灯远、近光速照射方向。基于该方法可实现汽车前照灯远、近光束照射方向的全自动检测,从根本上解决目前国内各类汽车前照灯检验仪存在的问题。     

汽车前照灯系统的设计

汽车前照灯系统(AFS)是一种能够自动改变两种以上的光型以适应车辆行驶条件变化的智能前照灯系统。它可以根据道路的状况、天气变化及车辆行驶中的变化,自动对前照灯光束状态进行动态最优化调节,以便实现灯具全过程的智能控制。它的研发对汽车夜晚行车安全起到了很大的作用。     

自动跟踪型汽车前照灯检测仪研究与实现

自动跟踪型汽车前照灯检测仪是集光、机、电技术于一体的专用仪器设备.可自动跟踪光轴,利用图像传感器对灯光图像进行采集,并利用数字图像处理技术对灯光图像进行处理,从而得到多个测量参数,是建立在多学科基础上的综合技术.试图从工程应用的角度出发,利用先进的嵌入式系统,研究如何快速准确地自动跟踪光轴、对灯光图像进行采集、对汽车前照灯的远近光进行自动检测,以及提高精度和抗干扰技术.     

基于小波变换的汽车前照灯图像边缘检测

用改进的基于小波多尺度变换的数字图像边缘检测算法,提取汽车前照灯近光图像的边缘,完成图像的初步预处理,从而为车灯的近光检测奠定基础.采用小波分解算法进行图像增强,针对小波模极大值在不同尺度下传播的特性,检测出图像在两个方向的极大值,之后通过边缘跟踪补偿和平滑细化得到图像的边缘.对比几种经典的边缘检测算子,小波变换的数字图像边缘算法对汽车前照灯近光图像的处理结果较好.     

浅析前照灯光束偏差检测合格存在问题及改进措施

汽车前照灯性能的好坏是影响汽车夜间阴雨天或昏暗天安全行驶的重要因素,随着公路等级提高,特别是高速公路,一级公路日新月异的发展,车辆行驶车速的提高,对汽车前照灯就提出了更高的要求。本文就汽车前照灯光偏差检测合格存在的问题提出了改进措施。     

基于数学形态学的图像边缘检测方法及应用

图像的边缘检测在图像处理中占有重要的地位,本文提出了一种基于数学形态学的边缘检测算法,并把它应用于Miss图像,Blood图像,和汽车的前照灯的光形图像的边缘检测中,实验证明用本文算法进行图像边缘检测,能较好地保持图像的细节特征,同时有效的抑制噪声。     

基于汽车导航电子地图的汽车AFS分析

针对现有的自适应前照灯系统(AFS)算法对弯道前、S型路面或过渡曲线上存在的滞后且不精确的问题,提出一种新的P-AFS算法,该算法可以有效利用汽车导航电子地图信息,通过车速和道路曲率来控制前大灯的偏转角度,再结合灯泡的5 lx等照度包络线确定AFS启动时刻.采用改进的遗传算法对PID参数进行整定,通过Carsim与Simulink建立整个系统的联合仿真模型,对简单道路模型和实际道路模型进行了仿真验证,并与传统的算法结果进行对比.结果表明:该P-AFS算法可以有效解决传统AFS算法的滞后性,并提高控制的精确度.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-