Efficient Hogel-Based Hologram Synthesis Method for Holographic Stereogram Printing

With the development of the holographic printer, printing synthetic hologram requires smaller holographic element (hogel) size to improve spatial resolution of the reconstruction. On the contrary, a larger hogel size affords higher angular resolution, but it leads to a lower lateral resolution and there exists a trade-off problem. In this paper, a hologram synthesis method based on three-dimensional (3D) rendering of computer-generated holographic stereogram (HS) is proposed to limit the spatial-angular trade-off problem. The perspectives of the 3D scene are captured by re-centering the camera method and transformed into parallax-related images by a proposed pixel re-arrangement algorithm for holographic printing. Unlike the conventional approaches, the proposed algorithm not only improves the angular resolution of the reconstruction while maintaining the hogel size fixed, but also keeps the spatial resolution without degradation. The effectiveness of the proposed method is verified by numerical simulation and an optical experiment.

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IV. Solar Granulation

Transactions of the International Astronomical Union ◽

10.1017/s0251107x00006209 ◽

1985 ◽

Vol 19 (1) ◽

pp. 103-108

Author(s):

R. Muller

Keyword(s):

Numerical Simulation ◽

Solar Cycle ◽

Spatial Resolution ◽

Three Dimensional ◽

Spectroscopic Properties ◽

The Sun ◽

Solar Granulation ◽

And Shifts ◽

Made In

During the period 1981-1984, major developments have been made in the analysis of the shape and shifts of photospheric lines used as a diagnostic of the convection in the outer layers of the Sun. The first three-dimensional numerical simulation of the solar granulation has been developed, and it, is able to reproduce with some success most of the observed morphological and spectroscopic properties of granulation. It is becoming clear that the properties of the solar granulation are variable over the solar cycle. Many questions remain to be solved; further progress will rely heavily on expected improvements of the spatial resolution of the observations and the availability of larger computers.

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Angular resolution dependency in 2D LA-ICP-MS mapping – the case for low-dispersion laser ablation cells

Journal of Analytical Atomic Spectrometry ◽

10.1039/c6ja00234j ◽

2016 ◽

Vol 31 (10) ◽

pp. 1998-2004 ◽

Cited By ~ 10

Author(s):

Johannes T. van Elteren ◽

Frank Vanhaecke

Keyword(s):

Laser Ablation ◽

Spatial Resolution ◽

Angular Resolution ◽

Lateral Resolution ◽

Line Scan ◽

Ms Imaging ◽

Icp Ms ◽

Low Dispersion

In LA-ICP-MS imaging mostly lateral resolution is considered, but this work will show that linear artifacts with an angular aspect to the line scan direction may have a different spatial resolution, depending on the blur introduced by LA sampling and aerosol washout/transfer.

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EVALUATION OF THE BKS LWD TOOL SPATIAL RESOLUTION BASED ON THE NUMERICAL SIMULATION RESULTS

Interexpo GEO-Siberia ◽

10.33764/2618-981x-2019-2-3-89-94 ◽

2019 ◽

Vol 2 (3) ◽

pp. 89-94

Author(s):

Kirill Danilovskiy ◽

Vyacheslav Glinskikh ◽

Oleg Nechaev

Keyword(s):

Numerical Simulation ◽

Electrical Resistivity ◽

Spatial Resolution ◽

Three Dimensional ◽

High Tech ◽

Arbitrary Distribution ◽

Drilling Tool ◽

Geoelectric Model ◽

Simulation Results ◽

Logging While Drilling

Reservoir microimaging tools are currently one of the most high-tech devices used in wireline logging and logging-while-drilling. Based on a three-dimensional numerical simulation, the spatial resolution of the first Russian lateral scanning logging-while drilling tool was estimated. An algorithm for constructing a geoelectric model with an arbitrary distribution of electrical resistivity in the near-wellbore space is described.

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Fusion Coding of 3D Real and Virtual Scenes Information for Augmented Reality-Based Holographic Stereogram

Frontiers in Physics ◽

10.3389/fphy.2021.736268 ◽

2021 ◽

Vol 9 ◽

Author(s):

Yunpeng Liu ◽

Xingpeng Yan ◽

Xinlei Liu ◽

Xi Wang ◽

Tao Jing ◽

...

Keyword(s):

Augmented Reality ◽

Three Dimensional ◽

Depth Map ◽

Depth Information ◽

Sampling System ◽

The Real ◽

Coding Method ◽

Holographic Stereogram ◽

3D Scene ◽

Instance Segmentation

In this paper, an optical field coding method for the fusion of real and virtual scenes is proposed to implement an augmented reality (AR)-based holographic stereogram. The occlusion relationship between the real and virtual scenes is analyzed, and a fusion strategy based on instance segmentation and depth determination is proposed. A real three-dimensional (3D) scene sampling system is built, and the foreground contour of the sampled perspective image is extracted by the Mask R-CNN instance segmentation algorithm. The virtual 3D scene is rendered by a computer to obtain the virtual sampled images as well as their depth maps. According to the occlusion relation of the fusion scenes, the pseudo-depth map of the real scene is derived, and the fusion coding of 3D real and virtual scenes information is implemented by the depth information comparison. The optical experiment indicates that AR-based holographic stereogram fabricated by our coding method can reconstruct real and virtual fused 3D scenes with correct occlusion and depth cues on full parallax.

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