Computer-generated photorealistic hologram using ray-wavefront conversion based on the additive compressive light field approach

Wang, Zi; Zhu, Liming; Zhang, Xu; Dai, Piao; Lv, Guoqiang; Feng, Qibin; Wang, Anting; Ming, Hai

doi:10.1364/ol.383508

Cited by 27 publications

(12 citation statements)

References 19 publications

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“…Zhan et al 9 rendered different images with real depths for each eye to provide approximate focus cue while relieving the discomfort from vergence-accommodation conflict. Wang et al 25 focused on photo-realistic hologram using ray-wavefront conversion.…”

Section: Light Field Displaysmentioning

confidence: 99%

Render‐based factorization for additive light field display

Deng

Yang

2021

Computer Animation & Virtual

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Augmented Reality (AR) and Virtual Reality (VR) applications enable viewers to experience 3D graphics immersively. However, current hardware either fails to provide multiple viewpoints like projectors or cause conflicts between vergence and accommodation like consumable headsets. Prior researchers have designed multi-view displays to solve the problem by enabling view-dependent images and focus cues. Nevertheless, it requires minutes to calculate one frame, which is critical for real-time AR/VR applications. In this paper, we propose a new render-based factorization for additive light field display and further improve the performance by optimizing the initialization of layers. We next compare our work with the state of the art and the results show that our solution has competitive results while the calculation takes less than 20 ms for each frame.

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Section: Light Field Displaysmentioning

confidence: 99%

Render‐based factorization for additive light field display

Deng

Yang

2021

Computer Animation & Virtual

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“…Since the birth of holography more than 60 years ago [1], it has evolved from traditional laser holography to today's Computer-Generated Holograms (CGHs) [2,3]. CGHs don't require special holographic recording materials, but instead use Spatial Light Modulators (SLMs) to load CGHs.…”

Section: Introductionmentioning

confidence: 99%

A Hybrid Iterative Algorithm of Amplitude Weighting and Phase Gradient Descent for Generating Phase-Only Fourier Hologram

Min¹,

Yang²,

Du³

et al. 2022

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Reconstruction of target images from phase-only hologram (POH) has the advantages of high diffraction efficiency and no conjugate terms. The Gerchberg-Saxton (GS) algorithm is a classical algorithm applied to recover the phase, but it most likely stagnantes after a few iterations. This paper proposes a hybrid iterative algorithm of Amplitude Weighting and Phase Gradient Descent (AW-PGD) to generate a higher-quality POH. Firstly, the quadratic phase is used as the initial phase, zero-pads the periphery of the target image, and then multiplies the two to form the complex amplitude as the iterative initial value. During iteration, the amplitude of the reconstructed image is constrained by an adaptive dynamic exponential term in the signal region to improve the reconstruction accuracy, the constraint in the non-signal region is relaxed to reduce the computational effort at the same time; and the phase gradient descent technology is used to increase the iteration step and speed up the convergence. Finally, the target image amplitude is reconstructed based on the generated POH. The numerical simulation results show that the algorithm does not have a significant increase in time cost with better reconstruction quality than the GS, Weighted GS (WGS) and Adaptive Weighted GS (AWGS) algorithm.

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“…Wave-optics-based algorithms mainly contain the point-sourcebased methods [9], polygon-based methods [10] and layer-based methods [11]. However, in these methods, complicated physical phenomena, such as occlusion, shading, reflection, refraction, glossiness, and transparency, are hard to encode into the CGH [12]. These features are essential for photorealistic reconstruction.…”

Section: Introductionmentioning

confidence: 99%

Accelerated Generation of a Pinhole-Type Holographic Stereogram Based on Human Eye Characteristics in Near-Eye Displays

et al. 2022

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In near-eye displays (NEDs), issues such as weight, heat, and power consumption mean that the rendering and computing power is usually insufficient. Due to this limitation, algorithms need to be further improved for the rapid generation of holograms. In this paper, we propose two methods based on the characteristics of the human eye in NEDs to accelerate the generation of the pinhole-type holographic stereogram (HS). In the first method, we consider the relatively fixed position of the human eye in NEDs. The number of visible pixels from each elemental image is very small due to the limited pupil size of an observing eye, and the calculated amount can be dramatically reduced. In the second method, the foveated region rendering method is adopted to further enhance the calculation speed. When the two methods are adopted at the same time, the calculation speed can be increased dozens of times. Simulations demonstrate that the proposed method can obviously enhance the generation speed of a pinhole-type HS.

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Computer-generated photorealistic hologram using ray-wavefront conversion based on the additive compressive light field approach

Cited by 27 publications

References 19 publications

Render‐based factorization for additive light field display

Render‐based factorization for additive light field display

A Hybrid Iterative Algorithm of Amplitude Weighting and Phase Gradient Descent for Generating Phase-Only Fourier Hologram

Accelerated Generation of a Pinhole-Type Holographic Stereogram Based on Human Eye Characteristics in Near-Eye Displays

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