Fast 3D Content Update for Wide-Angle Holographic Near-Eye Display

Kukołowicz, Rafał; Chlipała, Maksymilian; Martínez-Carranza, Juan; Idicula, Moncy Sajeev; Kozacki, Tomasz

doi:10.3390/app12010293

Cited by 5 publications

(1 citation statement)

References 41 publications

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“…Therefore, efficient computing of holograms is essential for video-rate 3D displays. Many studies have reported efficient methods that fall into three main routes: point-based [2][3][4], layer-based [5][6][7], polygon-based methods [8][9][10][11][12][13][14]. Notably, the line-based method reported in recent years employs a new computational idea that calculates only the contour lines of the object [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

High-speed rendering pipeline for polygon-based holograms

Wang¹,

Ito²,

Shimobaba³

2023

Photon. Res.

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As an important three-dimensional (3D) display technology, computer-generated holograms (CGHs) have been facing challenges of computational efficiency and realism. The polygon-based method, as the mainstream CGH algorithm, has been widely studied and improved over the past 20 years. However, few comprehensive and high-speed methods have been proposed. In this study, we propose an analytical spectrum method based on the principle of spectral energy concentration, which can achieve a speedup of nearly 30 times and generate high-resolution (8K) holograms with low memory requirements. Based on the Phong illumination model and the sub-triangles method, we propose a shading rendering algorithm to achieve a very smooth and realistic reconstruction with only a small increase in computational effort. Benefiting from the idea of triangular subdivision and octree structures, the proposed original occlusion culling scheme can closely crop the overlapping areas with almost no additional overhead, thus rendering a 3D parallax sense. With this, we built a comprehensive high-speed rendering pipeline of polygon-based holograms capable of computing any complex 3D object. Numerical and optical reconstructions confirmed the generalizability of the pipeline.

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Section: Introductionmentioning

confidence: 99%

High-speed rendering pipeline for polygon-based holograms

Wang¹,

Ito²,

Shimobaba³

2023

Photon. Res.

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Off-axis propagation algorithm for partial reconstruction of wide-angle computer-generated holograms

Martínez-Carranza¹,

Kozacki²

2022

Opt. Express

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A method for reconstruction of partial off-axis areas of arbitrary size for wide-angle viewing computer generated holograms is presented. Proposed method employs paraxial spherical phase factors and modified propagation kernels. This significantly reduces the numerical space–bandwidth product needed for off-axis wave field calculations, which makes it an efficient propagation method. As a result, propagated wavefields of high-off axis and large size output windows can be obtained. To that end, a phase-space analysis for obtaining the proper condition for implementing spatial-frequency zero-padding for accurate wavefield propagation is carried out. Hence, suppression of aliased components and high spatial resolution is possible. Nevertheless, proposed algorithm faces a computer memory bottleneck when reconstructing very large off-axis areas due to too extensive zero-padding needed. To solve this problem, a memory optimized tiling implementation is introduced. Utility of the developed propagation tools are proven by partial reconstructions from a high-resolution hologram. The size of the reconstructions areas ranges from 100 × 100 mm2 up to 550 × 550 mm2.

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LED near-eye holographic display with a large non-paraxial hologram generation

Kozacki¹,

Chlipała²,

Martínez-Carranza³

et al. 2022

Opt. Express

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In this paper, two solutions are proposed to improve the quality of a large image that is reconstructed in front of the observer in a near-eye holographic display. One of the proposed techniques, to the best of our knowledge, is the first wide-angle solution that successfully uses a non-coherent LED source. It is shown that the resulting image when employing these types of sources has less speckle noise but a resolution comparable to that obtained with coherent light. These results are explained by the developed theory, which also shows that the coherence effect is angle varying. Furthermore, for the used pupil forming display architecture, it is necessary to compute a large virtual nonparaxial hologram. We demonstrate that for this hologram there exists a small support region that has a frequency range capable of encoding information generated by a single point of the object. This small support region is beneficial since it enables to propose a wide-angle rigorous CGH computational method, which allows processing very dense cloud of points that represents three-dimensional objects. This is our second proposed key development. To determine the corresponding support region, the concept of local wavefront spatial curvature is introduced, which is proportional to the tangent line to the local spatial frequency of the spherical wavefront. The proposed analytical solution shows that the size of this area strongly depends on the transverse and longitudinal coordinate of the corresponding object point.

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Fast 3D Content Update for Wide-Angle Holographic Near-Eye Display

Cited by 5 publications

References 41 publications

High-speed rendering pipeline for polygon-based holograms

High-speed rendering pipeline for polygon-based holograms

Off-axis propagation algorithm for partial reconstruction of wide-angle computer-generated holograms

LED near-eye holographic display with a large non-paraxial hologram generation

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