Rapid hologram generation through backward ray tracing and adaptive-resolution wavefront recording plane

An advanced method for rapidly computing holograms of large three-dimensional(3D)objects combines backward ray tracing with adaptive resolution wavefront recording plane(WRP)and adaptive angular spectrum propagation.In the initial phase,a WRP with adjustable resolution and sampling interval based on the object’s size is defined to capture detailed information from large 3D objects.The second phase employs an adaptive angular spectrum method(ASM)to efficiently compute the propagation from the large-sized WRP to the small-sized computer-generated hologram(CGH).The computation process is accelerated using CUDA and OptiX.Optical experiments confirm that the algorithm can generate high-quality holograms with shadow and occlusion effects at a resolution of 1024×1024 in 29 ms.

High efficient generation of holographic stereograms based on wavefront recording plane

A computer generated holographic stereogram based on the wavefront recording plane （WRP） is presented. A WRP closed to the parallax image plane is introduced to record the complex amplitude in a small region for each point in the parallax image. By using three times of fast Fourier transform （FFT） to execute the Fresnel dif- fraction calculation between the WRP and the holographic stereogram plane, the object wave contributing to the hologram pattern can be achieved. The computation complexity of the proposed approach is dramatically reduced. The results show that the calculation time can be decreased by more than one order of magnitude.

Review on theory and applications of wavefront recording plane framework in generation and processing of digital holograms

The wavefront recording plane （WRP）, subsequently generalized to be known as the virtual diffraction plane （VDP）, is a recent concept that has been successfully deployed in fast generation and processing of digital holograms. In brief, the WRP and its extension, the VDP, is a hypothetical plane that is located between the hologram and the object scene, and which is at close proximity to the latter. As such, the fringe patterns on the hypothetical plane are carrying the holistic information of the hologram, as well as the local optical properties of the object scene. This important property enables a hologram to be processed with classical image processing techniques that are normally unsuitable for handling holographic information. In this paper we shall review a number of works, that have been developed based on the framework of the WRP and the VDP.

基于点源模型计算全息图快速生成算法的研究进展

计算全息图(CGH)的快速生成技术是全息三维显示系统的关键技术,基于点源模型的计算全息图由于模型简单、操作灵活而成为了计算全息方法中一个重要分支。但是使用点源模型计算全息图计算量庞大,为了达到实时显示的要求,提高全息图计算速度的方法被不断提出。对点源模型快速算法的发展历程进行了综述。从计算全息图的原理出发,根据点源模型快速算法的研究方向,将其分为算法和算法与高性能硬件结合两大类。通过分析各类算法的实现方法和存在的问题,指出了其改进的方向,介绍了高性能硬件对计算全息图的贡献,最后对点源模型快速算法的未来研究方向进行了展望。

基于波前记录平面的计算全息图快速生成算法最新研究进展

在全息三维显示领域,计算全息图的快速生成算法是重要的研究内容。波前记录平面法是一种基于点云加速计算全息图生成的方法,能有效减少计算时间。对波前记录平面计算全息图生成方法及应用的最新进展进行分析讨论,首先介绍波前记录平面方法的原理,然后详细分析波前记录的最新研究方法,从加快计算全息图的生成速度、提高三维重建图像质量及一些特殊应用如曲面全息成像等方面进行总结分析。详细分析各种波前记录平面方法在增加计算速度、提高重建像质量、减少查找表占用内存、增大视场角、去除混叠噪声等方面的改进及应用,并分析该方法在实时、动态、高质量、大视角全息三维显示中的作用。最后分析了各种方法的优劣,对波前记录平面方法的未来发展方向进行展望。