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We propose an integral imaging system that uses three lens arrays,including two convex lens arrays and a concave lens array.Compared with the conventional integral imaging system,the proposed system can remarkably enhance the viewing angle.The maximum viewing angle can be enlarged to 48°,which is 4.8times wider than that of the conventional system.The principle of the proposed system is elucidated,and the experimental results are presented in this letter. 相似文献
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2020年Liu和Yang提出了求解Hilbert空间中拟单调且Lipschitz连续的变分不等式问题的投影算法,简称LYA。本文在欧氏空间中提出了一种新的求解拟单调变分不等式的压缩投影算法,简称NPCA。新算法削弱了LYA中映射的Lipschitz连续性。在映射连续、拟单调且对偶变分不等式解集非空的条件下得到了NPCA所生成点列的聚点是解的结论。当变分不等式的解集还满足一定条件时,得到了NPCA的全局收敛性。数值实验结果表明NPCA所需的迭代步数少于LYA的迭代步数,NPCA在高维拟单调例子中所需的计算机耗时也更少。 相似文献
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We propose a one-dimensional integral imaging (1DII) display that consists of a display panel and a gradient-aperture parallax barrier. The gradient-aperture parallax barrier is symmetrical, and its slit widths gradually increase from both sides to the middle. The leftmost and rightmost slits are used to fix the viewing angle, whereas the other slits are used to increase the optical efficiency. A prototype of the proposed 1DII display is developed. Its optical efficiency is higher than that of the conventional display, but the viewing angles are the same. 相似文献
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随着显示技术的发展,3D显示给人们提供沉浸式体验和更加逼真的立体视觉享受。为了提高成像质量,准直背光集成成像系统可以收敛像素光线的发散角度,有效减小中心深度平面后体素的扩散趋势,进而减小重构体素尺寸,提高系统分辨率。然而,由于准直背光系统像素光线的传播路径与传统散射背光系统存在偏移,导致采样光线的像素映射错误,进而产生体素漂移和混叠,影响成像质量。因此,结合逆向光线追踪技术,提出一种精准的片源生成方法。该方法建立准直背光系统的光线传播几何,重新确定采样光线起点和方向,逆向跟踪每一条光线,使每根光线信息正确映射到对应像素。实验结果表明,该方法可以有效矫正光线偏移,解决体素飘逸和混叠问题,进而提高系统的成像分辨率。 相似文献
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Security is one of the key issues in communications, but it has not attracted much attention in the field of underwater wireless optical communication(UWOC). This Letter proposes a UWOC encryption scheme with orthogonal frequency division multiplexing(OFDM) modulation, based on the three-layer chaotic encryption and chaotic discrete Fourier transform(DFT) precoding. The three-layer chaotic encryption processes are bit stream diffusion, in-phase/quadrature encryption,and time-frequency scrambling... 相似文献
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江文豪邓欢冀清霖饶凤斌李强李大海 《光学与光电技术》2021,19(4):24-29
为了提升全息光学元件集成成像3D显示的离屏距离,提出了一种采用计算全息波前设计,对集成成像显示时的每个像素发散角进行精细的调控,来实现增大3D显示的离屏距离的方法。通过对设计波前进行计算机仿真得到了66.0 mm的连续3D景深,基于空间光调制器的光学重建实验实现了140.0 mm的集成成像离屏距离和75.0 mm的连续景深3D显示。该方法可以为基于全息光学元件的集成成像3D显示提供一种很好的离屏、3D分辨率增强和景深增强解决方案。 相似文献