On adjustment of stereo parameters in multiview synthesis for planar 3D displays

This paper investigates the impacts of stereo parameters in multiview synthesis for planar 3D display and presents a novel parameter adjustment method for reducing visual discomforts and geometric distortions. The proposed method combines the geometry of stereoscopic capturing system with the comfortable viewing rules for the human vision system in three steps. First, an identically sized representation between the virtual space and the display space is established, and the virtual camera parameters are derived based on the stereo geometry. Second, the scale factor between the physical space and the virtual space is computed based on the depth of focus theory to diminish vergence–accommodation conflicts. Last, the capturing and displaying parameters are adjusted according to the comfortable viewing zone and personal preference. Experimental results demonstrated that a reliable basis for multiview image synthesis and a more comfortable stereo perception can be achieved by applying the proposed method.     

Optical characterization of OLED displays

Multispectral viewing angle and imaging characterization have been applied to different organic light‐emitting diode (OLED) displays. Angular dependence of the OLED emission is always complex because of its multilayer structure. Spectral information is also related to the geometry of Fabry–Perot‐like structure of each OLED. High‐resolution viewing angle measurements of different OLED displays are reported and compared. Multispectral viewing angle polarization properties are also reported. Imaging measurements allow to detect wavelength shift on the surface of the displays probably related to thickness non‐uniformities. Local radiance fluctuations from one pixel to the other more related to driving problems due to the dispersion of the electric properties of the driving thin‐film transistors are also detected.     

机床异地设计中基于Web的3D图形协同浏览技术的研究

为提高机床制造企业对市场的响应能力和设计制造能力，共享产品开发的经验和资源，必须采用异地设计制造和协同工作等技术，因此，如何在网络环境下进行图形数据的发布、浏览、共享是工程实践中尤其是协同设计中迫切需要解决的问题本文在对协同浏览关键技术进行分析研究的基础上，设计并开发了异地协同机床设计中基于Web的协同显示组件系统，在该系统中多个协同用户可以同时浏览同一机床组件，进行协同讨论，并进一步进行协同设计工作，理论分析和应用实践证明该组件系统方案是可行的。     

3D遥视系统中视频对象的鼠标点取方法

对3D遥视系统中基于3D鼠标的视频对象点取方法进行了研究.在3D遥视/遥控系统的基本框架中加入了基于3D鼠标的对象操控处理模块,并对包括立体视频对象的视差提取、3D鼠标的叠加显示、对象人工标注、3D对象的鼠标事件处理等关键技术环节在内的核心模块"鼠标操控"的实现原理进行了细致的分析和设计,最后通过实验验证了本方法的正确性.     

Viewing angle switchable blue‐phase liquid crystal display with low voltage and high transmittance

We propose a viewing angle switchable blue‐phase liquid crystal display with low voltage and high transmittance. In this device, in‐plane protrusions are used to lower operating voltage and improve the transmittance. Besides, the top electrode can control viewing angle of the proposed display. When no voltage is applied to the top electrode, the display shows wide viewing angle mode. On the contrary, this display shows narrow viewing angle mode. So, this device exhibits low operating voltage, high transmittance, and good viewing angle controllable characteristics.     

大视角数字全息的研究

提出一种新的数字全息方法实现大视角彩虹全息的制作。根据两步法彩虹全息原理，用计算机制作彩虹全息图的H1，并用镜像折叠的新算法将大幅的全息图折叠成一幅较小的全息图。输出微缩后成为一个高密度的全息图。光学方法制作H2时，必须配以合适的平面镜，使再现的光波按光的可逆原理展开成原状。该种镜像折叠的方法巧妙地把计算机制全息与光学全息相结合，吸取了两者各自的优点，实现了大视角数字全息的制作。理论及实验结果表明该方法既解决了大幅度计算机制全息图的输出问题，又使相同信息量的数据容量大大减少，为计算全息图用于立体显示的研究开辟了一条新的途径。     

三维集成成像中无串扰显示系统的设计与实现

通过对集成成像原理和串扰现象原理的分析,基于显示系统的串扰与观察距离的关系和人眼视觉特性,提出了显示系统的无串扰设计方法。设计实例及实验结果表明,本文的三维集成成像显示系统的无串扰设计方法不仅使在预期的观察位置观看所得的三维集成像不再受串扰现象影响,而且满足人眼视觉分辨特性要求。     

一种曲面药瓶标签校验方法关键技术

针对药瓶标签具有曲面性以及采集设备视角小的问题,提出了一种基于全景拼接技术的药瓶标签校验方法.采用柱面反投影算法将发生畸变的曲面药瓶标签进行校正,使用SIFT尺度不变特征算法对校正后标签图像进行拼接,提取拼接后的标签名等信息,采用基于连通域的字符分割技术进行字符切分,计算分割字符与模板字符的特征矩阵及相似度矩阵,从而识别出药瓶标签.结果表明,该方法能够校正标签两侧的文字压缩,实现图像拼接,得到包含完整药瓶名称的图像,并能够实现字符的准确切分,具有速度快和识别率高的优点.     

舰船目标机载ISAR成像的最优观测角研究

SAR处理对三维转动的舰船成像会产生模糊效应,如果采用适当的ISAR处理方法对舰船成像,则舰船的三维转动不仅不会造成模糊,还会提高ISAR图像的分辨率和信息量.观测到的ISAR图像信息依赖于观测视角,要得到信息量最大的ISAR图像需要对观测视角进行优化设计.文中详细研究了舰船目标的机载ISAR成像特点,导出了ISAR图像信息量与观测视角的定量关系式,给出了求解最优观测视角的方法.仿真结果验证了该方法的有效性.