Computational Implementation of Asymmetric Integral Imaging by Use of Two Crossed Lenticular Sheets

We propose an asymmetric integral imaging method to adjust the resolution and depth of a three‐dimensional image. Our method is obtained by use of two lenticular sheets with different pitches fabricated under the same F/#. The asymmetric integral imaging is the generalized version of integral imaging, including both conventional integral imaging and one‐dimensional integral imaging. We present experimental results to test and verify the performance of our method computationally.     

基于柱镜光栅的自由立体显示图像融合算法

针对现有的图像融合算法存在频域混叠现象及通用性差的问题,提出一种基于柱镜光栅的自由立体图像融合算法。在低通抗混叠滤波前对视点图像进行非等比例上采样,调整视点图像亚像素映射公式,强化公式的通用性。实验结果表明,该算法在定性的视觉效果及定量的图像质量评估方面都具有一定的优势。     

2‐D/3‐D displays based on switchable lenticulars

Abstract— An attractive concept for 3‐D displays is the one based on LCDs equipped with lenticular lenses. This enables autostereoscopic multiview 3‐D displays without a loss in brightness. A general issue in multiview 3‐D displays is their relatively low spatial resolution because the pixels are divided among the different views. To overcome this problem, we have developed switchable displays, using liquid‐crystal (LC) filled switchable lenticulars. In this way, it is possible to have a high‐brightness 3‐D display capable of fully exploiting the native 2‐D resolution of the underlying LCD. The feasibility of LC‐filled switchable lenticulars was shown in several applications. For applications in which it is advantageous to be able to display 3‐D and 2‐D content simultaneously, a 42‐in. locally switchable prototype having a matrix electrode structure was developed. These displays were realized using cylindrically shaped lenticular lenses in contact with LC. An alternative for these are lenticulars based on gradient‐index (GRIN) LC lenses. Preliminary results for such switchable GRIN lenses are presented as well.     

基于柱镜光栅LCD的裸眼显示技术研究

为了获得更高质量的目标图像,克服现有方法的不足,提出基于柱镜光栅LCD显示设备的光栅参数测量、立体图像合成与分解的改进方法.     

多视角裸眼3D电视的技术实现

研究超高清多视角裸眼3D电视的实现技术,从方案成本、设计简易度、工艺实现、系统架构、产品性能等方面分别对采用光栅式裸眼3D技术和透镜式裸眼3D技术进行探讨,接着再从视觉表现和技术实现上分析了双视角裸眼3D技术和多视角裸眼3D技术的优缺点,认为超高清屏幕将有效解决多视角裸眼3D技术带来的3D画面分辨率降低问题,因此超高清多视角裸眼3D电视将是未来3D电视的发展主流。     

2‐D/3‐D switchable displays

Abstract— In this paper, the design of a lenticular‐based 2‐D/3‐D display for mobile applications is described. This display combines look‐around capability with good 3‐D resolution. In order to allow high‐resolution datagraphic applications, a concept based on actively switched lenses has been developed. A very noticeable problem for such displays is the occurrence of dark bands. Despite slanting the lenticular and defocusing the lens, banding becomes unacceptable when the display is viewed from an angle. As a solution, fractional viewing systems to reduce the banding intensity by almost two orders of magnitude is introduced. The resulting 3‐D display can be viewed from any horizontal direction without banding.     

预变形对FeNiC合金马氏体相变形态影响

研究了母相预变形对Fe-23Ni-0.55C合金马氏体相变表面浮凸形貌、组织形态的影响.结果表明:母相预拉伸变形和压缩变形对Fe-23Ni-0.55C合金马氏体影响有所不同.母相预拉伸变形,其马氏体由透镜状变为细针状,表面浮凸角增大;母相预压缩变形,随变形量的增大,不但其马氏体边缘破碎,而且马氏体中脊发生弯曲、甚至断裂.但是母相预变形并未改变其马氏体相变的惯习面和表面浮凸形貌.惯习面仍为{259}f,表面浮凸形貌均为"N"型.     

3-D自由立体显示的性能表征

三维自由立体显示的图像生成和参数显示与一般的二维显示不同,需要其它的方法来校验光学性能。目前工业上缺少标准化的三维显示测试方法,报道过的测量结果可能不具有可比性,因此需要建立标准化的测试方法,而且这个方法的计量和度量必须适用于任何一种特定的立体显示技术。文中探索了对自由立体显示技术进行表征的一些方法。     

Short focal length tunable liquid crystal lenticular lens array based on fringe field effect

A liquid crystal (LC) lenticular lens array based on fringe field effect is proposed. The gradient refractive index (GRIN) profile can be generated in the LC layer because of the fringe field between the strip‐shaped electrodes and the bottom electrode. The proposed LC lenticular lens array possesses ideal lens‐like phase profile and shortest focal length (1.199 mm) when the driving voltage is 5.4 V. The focal length can be tuned with millisecond response time by changing the driving voltage of the proposed LC lenticular lens array. The rise time τ_rise and decay time τ_decay of the proposed LC lenticular lens array are 162 and 94 ms, respectively.     

一种消除柱透镜光栅自由立体显示图像串扰的方法

提出了一种通过纠正平面显示屏上合成图像子像素亮度值来使得柱透镜光栅自由立体显示器相邻视点间的显示图像串扰消除的方法。针对合成图像分析其串扰的产生原因,并根据合成图像上显示的子像素亮度值、透过光栅观看到的子像素亮度值以及视点间的串扰系数3者之间的关系,推导出消除串扰的计算公式并实验证实了该方法的正确性。