相位一致性图像及其在目标跟踪中的应用(英文)

针对传统实时相关跟踪方法对照度变化敏感的问题,提出了一种基于相位一致性图像的相关跟踪方法.利用相位一致性函数值在[0,1]区间内且无量纲、对图像的亮度和对比度具有不变性等特点,首先对原始图像进行相位一致性检测,得到相位一致性图像,再利用MAD(Minimum Absolute Difference)等相关跟踪算法在相位一致性图像中对目标进行跟踪运算.对可见光和红外图像的实验表明,在图像的亮度和对比度发生剧烈变化的情况下,算法仍能保持对目标的稳定跟踪.该方法可用于解决传统实时相关跟踪方法普遍存在的因照度变化导致跟踪点漂移甚至跟踪失败的问题.     

Direct simulation Monte Carlo ray tracing model of light scattering by a class of real particles and comparison with PROGRA experimental results

The Direct Simulation Monte Carlo (DSMC) model is presented for three-dimensional single scattering of natural light by suspended, randomly oriented, optically homogeneous and isotropic, rounded and stochastically rough cubic particles. The modelled particles have large size parameter that allows geometric optics approximation to be used. The proposed computational model is simple and flexible. It is tested by comparison with known geometric optics solution for a perfect cube and Lorenz–Mie solution for a sphere, as extreme cases of the class of rounded cubes. Scattering and polarization properties of particles with various geometrical and optical characteristics are examined. The experimental study of real NaCl crystals with new Progra² instrument in microgravity conditions is conducted. The experimental and computed polarization and brightness phase curves are compared.     

Millimeter Wave Passive Detection Simulation System

In this paper, millimeter wave Radiometer Dynamic Simulation system (RDS) is presented as a typical pre-verification system. Before designing hardware circuit, we can utilize RDS system to simulate radiometric working orders by presetting its technical parameters and simulation environment. Thus it can improve radiometric validity and accuracy on target detection and pattern recognition. On the basis of discussing radiation characteristic and mathematical model, a system framework was proposed.     

发光层掺杂对红光OLED性能影响研究

制备高效率、高亮度的红光有机发光二极管是显示器实现全彩色的关键,对高性能的红光有机发光二极管器件研究具有十分重要的意义.本文主要研究了掺杂剂(DCJTB)浓度对红光有机发光二极管性能影响.实验采用真空热蒸镀的方法,选取结构为ITO／2-TNATA(20 nm)/NPB(30 nm)/AlQ(50 nm):(X%)DCJTB／AlQ(30 nm)／LiF(0.8 nm)／Al(100 nm)的红光器件,在高准确度膜厚控制仪的监控下,实现了有机薄膜功能材料的精确蒸镀.研究表明:红光掺杂剂掺杂浓度为(2.5~3.0)%时,在12 V电压下,可以得到发光亮度最高达到8 900 cd/m²,发光效率大于2.8 cd/A,且发光光谱波长为610~618 nm较为理想的红光有机发光二极管器件.     

立体显示器质量测试与性能分析研究

立体显示技术是当今信息显示的前沿和热点方向,其终端显示的图像质量也逐渐引起注意.本文针对立体显示过程中的质量问题,给出了影响立体显示器显示质量的因素,如串扰、可视角、亮度、双眼亮度差、亮度均匀性等指标的测量和评估方法.基于当前最流行的LCD显示屏和PDP显示屏样本进行了测试,比较了不同尺寸和不同制式立体显示屏各种测量值之间的差异.通过分析实验数据,得出了上述测量指标对不同立体显示屏的影响.结果表明:快门式立体电视采用PDP屏幕的串扰度要远远低于采用LCD屏幕的串扰度,拥有更广阔的可视角范围.     

Fabrication of dual brightness enhancement structures on light guide plates using UV roll-to-plate imprinting lithography

We proposed a roll-to-plate UV imprinting lithography (RPIL) process for fabricating dual brightness enhancement structures on light guide plates (LGPs). The refractive indices of the UV resin for layers imprinted on the LGP were investigated through computer-aid optical analysis and experiments. The refractive indices of the resins ranged from 1.49 to 1.69, and flat films such as polyethylene terephthalate (PET) films used by the media layer have better on-axis luminous intensity enhancement rate rates. Using the proposed process, several vertical prismatic structures on the LGP achieved a formability rate of 97% respectively, and the luminous intensity enhancement rate exceeded 2.1, which is almost the same as that of 3M's dual-prism film. This study demonstrates the potential of our proposed process for fabricating multi-layer of microstructures on the LGP.     

霾光谱特性分析与卫星遥感识别算法

近年来,我国频繁发生的灰霾污染事件和常态性的高细颗粒物浓度(PM_2.5),已经引起了全世界范围的广泛关注。卫星遥感能够对大气污染进行快速准确地监测。然而在大气遥感领域具有代表性的中分辨率成像光谱仪(NASA/MODIS),其云监测和暗像元反演算法通常把灰霾当做薄云、雾或地表亮目标处理,无法反演霾天的气溶胶光学厚度(aerosol optical depth, AOD)。笔者研究了云、雾、霾、地表覆盖等不同像元在可见光、近红外以及红外通道的光谱特性。基于MODIS数据,参考相关的云监测和气溶胶反演算法,选取多个对灰霾敏感的光谱通道,计算表观反射率和亮度温度。针对不同波段,分别探讨了霾与薄云、低层云、雾、浓密植被和地表亮目标等像元之间的光谱差异,统计灰霾分布的阈值区间,并设计基于MODIS卫星遥感数据的灰霾识别自动处理流程。通过对2008年华北平原春夏两个重霾事件进行测试,该算法的霾分布监测结果与卫星真彩图具有较好的一致性。基于北京和香河AERONET站点观测的高AOD数据,验证了本算法的霾识别率接近80%,在一定程度能够弥补MODIS标准气溶胶算法用于灰霾天的不足。最后,分析了灰霾识别过程中的主要误差来源,并提出了基于霾纹理特征,以及其他辅助数据支撑的改进方法。     

草原枯萎植物的热红外偏振特性研究

为了探究草原枯萎植物的热红外偏振特性,根据热红外偏振的探测机理,利用热红外辐射计对草原枯萎植物样品进行室内测量,发现其热红外偏振辐射亮度、亮温都有随探测角的增大而增大、随方位角和偏振态的增大先增大后减小的趋势,需要特别说明的是虎尾草在180°方位角的亮温是先减小后增大,实验所反映的热红外偏振特性与物质的粗糙程度、探测方向、物质的内部结构及其发射能力有关,该研究为定量研究奠定了基础。     

Global brightness and local contrast adaptive enhancement for low illumination color image

An adaptive enhancement algorithm is proposed in the paper for low illumination color image which is low brightness and low contrast. The algorithm is realized through three steps: the global brightness adaptive adjustment, locally adaptive contrast enhancement and color restore. Experiments show that the brightness and local contrast of low illumination color image can be effectively enhanced. The details, especially in the dark region of enhanced image are more prominent and the enhanced image is more vivid than some other methods for low illumination color image enhancement.     

基于环境光检测的场景融合系统

基于深度相机和人眼检测模型实时返回观察者眼睛的位置坐标,利用坐标转换模型计算合理的显示区域,通过颜色传感器的颜色分量数据估计环境色温和亮度;根据提前标定的显示参数映射表调整显示状态,使其最接近环境光的色彩表现。搭建了场景融合实验系统,系统分为位置监测相机、图像采集相机、颜色传感器、显示设备、处理器五部分.分别在色温为6354 K,照度为160 lx的室内场景和色温为6197 K,照度为848 lx的室外场景下进行融合实验.实验结果表明,场景融合方案能够为不同位置的观察者调整显示画面,并根据环境光信息改变显示参数,融合效果优良,单次执行仅需283 ms.