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据了解,当今社会上青少年中患近视眼疾的不少,特别是在中学生中,出于视力不好,对青年们报考各类学校或参军、参加工作都带来了直接影响。这一情况已引起社会各界的重视。本文想就如何保证可靠照明条件的问题,提供一种近似计算的方法。 相似文献
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对感兴圈工作原理的探究黄敏明(南昌铁路机械学校330013)感应因是用来获得高电压的一种仪器,可作为低压放电管、阴极射线管、伦琴射线管、电谐振等实验的高压电源,是物理实验中必不可少的仪器.因此了解感应圈的工作原理和特性将有助于教学.1感应圈的工作原理... 相似文献
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机器视觉由于具有非接触、可视化好、自动化和智能性高等优点,在航空航天、国防、工业现场等重要领域得到广泛的应用,其特征点的检测精度会大大影响视觉测量的精度。在研究视觉测量的光点中心提取技术的过程中,提出二维卷积光重心法,可有效地抑制光点边缘对光点中心位置的影响,大大地提高了光点中心的提取精度,既可以应用于发光特征点的提取,也可以应用于反光特征点的提取。利用该方法提取空间特征点进行三维重构的精度也比其他方法要高,能达到10^-4左右,基本满足工程测量的要求。 相似文献
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Target recognition plays a vital role in video surveillance, land and ocean exploration, in which imaging detection especially night vision is widely used. It is known that imagery detection is affected not only by absorption and scattering properties of atmosphere or water, but also the optical systems including lenses and sensors. In order to enhance the visual quality of the night vision detecting images to a best possible level, applications such as restoration and super-resolution reconstruction can be applied. The presented effort applies a spatial adaptive regularized MAP reconstruction method to a night vision laser diode (LD) imaging detection system. Blind, objective image quality metrics are adopted for determining the iteration time. Experimental results of the target recognition show adequate improvement in the detecting range as well as the detecting quality provided by the proposed approaches. 相似文献
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在基于机器视觉的原棉异纤维检测系统中,选择能满足检测系统的光源和照明方案是提高系统检测率和检出率的关键,使检测对象尽可能多地显现出特征信息。选用单芯片InGaN(蓝)/YAG荧光粉型白光LED作为照明光源,采用理论计算和非成像光学设计的方法对LED阵列的光照度分布进行了研究,并根据原棉异纤维检测系统对光源光照度的具体要求,设计出了LED正方形阵列和三角形阵列两种排列方式,并利用TracePro软件对两种阵列形式进行仿真。通过比较两种阵列形式光照度分布的结果,最终选用高光照度且均匀性好的LED三角形阵列作为原棉异纤维检测系统的照明光源,满足了机器视觉成像的要求。 相似文献
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Though a significant amount of work has been done on detecting obstacles, not much attention has been given to the detection
of drop offs, e.g., sidewalk curbs, downward stairs, and other hazards. In this paper, we propose algorithms for detecting
negative obstacles in an urban setting using stereo vision and two-stage dynamic programming (TSDP) technique. We are developing
computer vision algorithms for sensing important terrain features as an aid to blind navigation, which interpret visual information
obtained from images collected by cameras mounted on camera legs nearly as high as young person. This paper focuses specifically
on a novel computer vision algorithm for detecting negative obstacles (i.e. anything below the level of the ground, such as
holes and drop-offs), which are important and ubiquitous features on and near sidewalks and other walkways. The proposed algorithm
is compared to other algorithms such as belief propagation and random growing correspondence seeds (GCS). According to the
results, the proposed method achieves higher speed, more accurate disparity map and lower RMS errors. The speed of the proposed
algorithm is about 28% higher than the random GCS algorithm. We demonstrate experimental results on typical sidewalk scenes
to show the effectiveness of the proposed method. 相似文献
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着重分析微光夜视仪的心脏元件──微光管的合理匹配,并对其光学系统主要参数设计原则与方法作了扼要论述。最后根据人眼视觉特性,结合光电有关参数,对夜视视见能力作了理论分析。 相似文献
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微光成像系统视距理论公式的修正 总被引:12,自引:2,他引:10
介绍了微光成像系统视距理论的基本概念,在对微光成像系统视距探测方程推导的基础上,分析了各参量间的关系及其对整体性能的影响,从大气透过率和光谱匹配等诸多方面进行修正,建立了更为实用和完善的视距探测方程,并结合车辆驾驶夜视仪进行了视距估算,验证了经修正后的视距公式的实用性,为微光成像系统的优化设计以及寻求实现中远距离观察的最优技术途径提供了理论帮助,这对微光成像系统的改进、提高和发展也具有一定的指导意义。最后提出了一些改进微光成像系统视距性能的途径。 相似文献