The visual control of reaching and grasping: Binocular disparity and motion parallax.

The primary visual sources of depth and size information are binocular cues and motion parallax. Here, the authors determine the efficacy of these cues to control prehension by presenting them in isolation from other visual cues. When only binocular cues were available, reaches showed normal scaling of the transport and grasp components with object distance and size. However, when only motion parallax was available, only the transpont component scaled reliably. No additional increase in scaling was found when both cues were available simultaneously. Therefore, although equivalent information is available from binocular and motion parallax information, the latter may be of relatively limited use for the control of the grasp. Binocular disparity appears selectively important for the control of the grasp. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

狭缝光栅自由立体显示器的立体图像串扰度

为了表征狭缝光栅自由立体显示器存在的左右眼视差图像的混叠程度,提出了立体图像串扰度C的概念。根据狭缝光栅自由立体显示器的结构和工作原理,应用几何光学知识,分析得出了立体图像串扰度C的计算公式,并给出了一个具体的狭缝光栅自由立体显示器的计算结果。通过观看实验,证明了所定义的立体图像串扰度C可以定量描述观看者在立体可视区域看到的立体图像的串扰程度。     

双目视差测距望远光学系统设计

双目视差测距望远镜主要应用于对动态目标的测量,特别是飞机飞行距离的测量。双目视差测距望远系统,不对外发射信号,属于被动式测距仪,因此具有被动接收式和非接触式的特点,可测量500~5000m大范围距离。主要探讨了双目视差望远系统的主要光学原理,并利用Zemax光学设计软件对双目视差望远光学系统进行设计与优化,并对本光学系统进行了误差分析。使用CMOS自动调焦技术,提高了双目望远镜的成像质量。双目视差测距望远系统的测距理论误差在0.91%以下,满足测距理论误差小于1%的要求。     

Cross‐talk acceptability in natural still images for different (auto)stereoscopic display technologies

Abstract— One of the most annoying distortions in (auto)stereoscopic displays is probably cross‐talk, visible as double edges, which is mainly caused by an imperfect separation of left‐ and right‐eye images. For different types of three‐dimensional (3‐D) displays, cross‐talk is caused by different origins, which could result in different levels of perceived image distortion. To evaluate the influence of (auto)stereoscopic display technology on cross‐talk perception, optical measurements and subjective assessments were performed with three different types of 3‐D displays. It is shown with natural still images that the 3‐D display technology with the lowest luminance and contrast level tolerates the highest level of cross‐talk, while still maintaining an acceptable image‐quality level.     

全分辨率的低串扰时分复用狭缝光栅3D显示

提出了一种基于后置视差光栅的3D自由立体显示结构设计,用于减少显示中产生的串扰并实现全分辨率3D图像的显示。这种显示结构包含了一个后置视差光栅和一个2D显示面板。后置视差光栅由OLED面板光源制成,可方便地通过开关指定位置的像素,实现光栅透光部分的宽度与位置的调节。2D显示面板中的合成图像受到后置视差光栅的调制,显示出3D图像。叙述了这种设计的原理和相关参数的计算。根据设计的原理和相关参数,开发了一个显示结构的原型。实验指出通过改变光栅透光部分的宽度和位置,可有效降低串扰的产生。时分复用技术的引入也可用于实现全分辨率的3D图像显示。     

基于表面方向的障碍物检测方法

针对障碍物检测问题中特殊的要求和特点,受原有的利用特征点匹配计算视差方法的启发,提出了一种全新的快速匹配检测障碍物的方法--表面方向法,可以描述平面的方向.与计算深度确定障碍物的方法不同,该算法根据物体表面基本与地面垂直这一特性来检测障碍物.     

新型单摄像机镜像双目视觉传感器的研究

通过分析玻璃厚度激光折射测量原理误差,并以双目立体视觉传感器三维测量模型为基础,提出一种自动补偿玻璃板上下表面倾斜的单像机双目视觉传感器模型.变传统的双CCD摄像机结构为单CCD摄像机结构,加装一组对称光学反射镜,镜像出一对虚拟摄像机,可在同一个CCD像面上采集到存在视差的两幅图像,从而消除玻璃板上下表面倾斜角引起的系统误差;建立了标定数学模型,并确定视觉传感器测量模型的标定方法.     

在虚拟现实中快速应用立体显示

提出了立体照相机的概念,通过立体照相机分析了平行立体投影法的视差性质、瞳距大小及视点的视图和投影变换,最后给出了开发立体显示的步骤.实验表明,程序开发者只需遵循给定的步骤开发支持立体显示的虚拟现实程序,不必经过多次的尝试便可以体验良好的立体视觉效果,大大缩短了程序开发时间.     

随机点立体画的生成原理与实现

在立体视觉中,人造三维立体画在用来分析和验证算法的性能方面起着重要的作用.对随机点立体画生成的原理进行了详细的阐述.利用视差理论和双目立体视觉原理,用VC++6.0编程并生成了随机点立体画.     

Autostereoscopic video display with motion parallax

Abstract— A multi-viewer autostereoscopic display that provides motion parallax without encumbering the observer with special equipment is described. The display is built around a single liquid-crystal panel, from which multiple images are projected to a screen where they form the 3-D image. The display can be produced economically because it uses a single display panel and conventional optics. The primary advantage of this technique is its simplicity. Computer-generated images are supplied to the liquid-crystal panel with a single video board. 3-D television can be broadcast by a single unmodified television station (NTSC, PAL, SECAM, HDTV, etc.), and recorded and replayed in 3-D with a VCR. Applications include 3-D video arcade games, avionics, engineering workstations, scientific visualization, video phones, and 3-D television.