主动式全息显示的全息图快速生成

全息图的生成速度影响了全息三维显示的实用化, 大尺寸、大场景全息图的生成尤为困难, 为了解决此问题, 将人眼跟踪技术和指向光技术用于全息显示, 形成主动式全息显示是一种解决动态全息显示的途径。针对主动式全息显示的需要, 提出一种基于二步全息算法及空间冗余光波去除的并行全息图生成方案。首先根据二步全息算法计算行列贡献分量, 结合空间冗余光波去除原理确定子全息图范围, 合理设计基于 GPU的 CUDA并行计算方案, 以实现大尺寸、大场景全息图的快速生成。实验表明这种方法有效可行, 二步算法的引入使计算速度在并行计算的基础上再提高 10倍左右, 空间冗余光波的去除有效克服大场景与空间采样间隔之间的矛盾。

Abstract

In holographic three-dimensional display, the generation speed of the hologram affected its practical application. Particularly, it is difficult to generate hologram of the large size and large scene fast. In order to solve the problem, the pupil tracking and directional backlight were applied to holographic display. The formation of active holographic display is a way to solve the dynamic holographic display problem. For the need of active holographic display, a parallel hologram generation scheme based on two-step hologram algorithm and spatial redundancy lightwave removal algorithm was proposed. Firstly, rank contribution components were calculated by the two-step algorithm. Secondly, the scope of the sub-hologram was determined by the spatial redundancy lightwave removal algorithm. Finally, a reasonable CUDA parallel computing program was designed to generate hologram of the large size and large scene fast. The experimental results indicated that the algorithm was effective and feasible. With the two-step algorithm, the computing speed was accelerated about ten times on the basis of parallel computing technology. The contradiction between the large scene and spatial sampling interval was also overcome effectively by the spatial redundancy lightwave removal algorithm.

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