scholarly journals Ownership protection for light-field 3D images: HDCT watermarking

2021 ◽  
Author(s):  
xiaowei Li ◽  
Zhiqing Ren ◽  
Tianhao Wang ◽  
Huan Deng
Keyword(s):  
Light Field ◽  
3D Images ◽  
Ownership Protection

scholarly journals Selective volume illumination microscopy offers synchronous volumetric imaging with high contrast

2018 ◽  
Author(s):  
Thai V. Truong ◽  
Daniel B. Holland ◽  
Sara Madaan ◽  
Andrey Andreev ◽  
Josh V. Troll ◽  
...  
Keyword(s):  
Light Field ◽  
Image Data ◽  
Light Sheet ◽  
Beating Heart ◽  
Wide Field ◽  
Axial Resolution ◽  
3D Images ◽  
Volumetric Imaging ◽  
Volume Of Interest ◽  
Image Volume

AbstractLight field microscopy provides an efficient means to collect 3D images in a single acquisition, as its plenoptic detection captures an extended image volume in one snapshot. The ability of light field microscopy to simultaneously capture image data from a volume of interest, such as a functioning brain or a beating heart, is compromised by inadequate contrast and effective resolution, due, in large part, to light scattering by the tissue. Surprisingly, a major contribution to the image degradation is the signal scattered into the volume of interest by the typical wide-field illumination that excites the sample region outside the volume of interest. Here, we minimize this degradation by employing selective volume illumination, using a modified light sheet approach to illuminate preferentially the volume of interest. This minimizes the unavoidable background generated when extraneous regions of the sample are illuminated, dramatically enhancing the contrast and effective resolution of the captured and reconstructed images. Light Field Selective Volume Illumination Microscopy (LF-SVIM, SVIM for short) dramatically improves the performance of light field microscopy, and offers an unprecedented combination of synchronous z-depth coverage, lateral and axial resolution, and imaging speed.

Light field display using wavelength division multiplexing

2020 ◽  
Vol 2020 (2) ◽  
pp. 101-1-101-4
Author(s):  
Masaki Yamauchi ◽  
Tomohiro Yendo
Keyword(s):  
Wavelength Division Multiplexing ◽  
High Speed ◽  
Light Field ◽  
Wavelength Modulation ◽  
3D Display ◽  
Mechanical Motion ◽  
3D Images ◽  
Wavelength Division ◽  
Binary Images ◽  
Time Division

We propose a large screen 3D display which enables multiple viewers to see simultaneously without special glasses. In prior researches, methods of using a projector array or a swinging screen were proposed. However, the former has difficulty in installing and adjusting a large number of projectors and the latter cases occurrence of vibration and noise because of the mechanical motion of the screen. Our proposed display consists of a wavelength modulation projector and a spectroscopic screen. The screen shows images of which color depends on viewing points. The projector projects binary images to the screen in time-division according to wavelength of projection light. The wavelength of the light changes at high-speed with time. Therefore, the system can show 3D images to multiple viewers simultaneously by projecting proper images according to each viewing points. The installation of the display is easy and vibration or noise are not occurred because only one projector is used and the screen has no mechanical motion. We conducted simulation and confirmed that the proposed display can show 3D images to multiple viewers simultaneously.

Efficient Variational Light Field View Synthesis For Making Stereoscopic 3D Images

2015 ◽  
Vol 34 (7) ◽  
pp. 183-191 ◽  
Author(s):  
Lei Zhang ◽  
Yu-Hang Zhang ◽  
Hua Huang
Keyword(s):  
Light Field ◽  
View Synthesis ◽  
3D Images ◽  
Stereoscopic 3D ◽  
Field View

scholarly journals Aktina Vision: Full-parallax three-dimensional display with 100 million light rays

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Hayato Watanabe ◽  
Naoto Okaichi ◽  
Takuya Omura ◽  
Masanori Kano ◽  
Hisayuki Sasaki ◽  
...  
Keyword(s):  
Light Field ◽  
Three Dimensional ◽  
Prototype System ◽  
3D Display ◽  
3D Images ◽  
Image Reproduction ◽  
Light Rays ◽  
Real Objects ◽  
Three Dimensional Display ◽  
First Time

AbstractNatural three-dimensional (3D) images, perceived as real objects in front of the viewer, can be displayed by faithfully reproducing light ray information. However, 3D images with sufficient characteristics for practical use cannot be displayed using conventional technologies because highly accurate reproduction of numerous light rays is required. We propose a novel full-parallax light field 3D display method named ‘Aktina Vision’, which includes a special top-hat diffusing screen with a narrow diffusion angle and an optical system for reproducing high-density light rays. Our prototype system reproduces over 100,000,000 light rays at angle intervals of less than 1° and optimally diffuses light rays with the top-hat diffusing screen. Thus, for the first time, light field 3D image reproduction with a maximum spatial resolution of approximately 330,000 pixels, which is near standard-definition television resolution and three times that of conventional light field display using a lens array, is achieved.

scholarly journals Instantaneous isotropic volumetric imaging of fast biological processes

2018 ◽  
Author(s):  
Nils Wagner ◽  
Nils Norlin ◽  
Jakob Gierten ◽  
Gustavo de Medeiros ◽  
Bálint Balázs ◽  
...  
Keyword(s):  
Blood Flow ◽  
Light Field ◽  
Flow Imaging ◽  
Biological Processes ◽  
Motion Artefacts ◽  
3D Images ◽  
Volumetric Imaging ◽  
Blood Flow Imaging ◽  
Cellular Resolution ◽  
Simultaneous Acquisition

AbstractCapturing highly dynamic biological processes at sub-cellular resolution is a recurring challenge in biology. Here we show that combining selective volume illumination with simultaneous acquisition of orthogonal light-fields yields 3D images with high, isotropic spatial resolution and free of reconstruction artefacts, thereby overcoming current limitations of light-field microscopy implementations. We demonstrate Medaka heart and blood flow imaging with single-cell resolution and free of motion artefacts at volume rates up to 200Hz.

Measurements in 3D images

1991 ◽  
Vol 49 ◽  
pp. 408-409
Author(s):  
John C. Russ
Keyword(s):  
Three Dimensional ◽  
Image Plane ◽  
X Rays ◽  
Traditional Use ◽  
3D Images ◽  
Confocal Scanning Laser Microscope ◽  
Hard Materials ◽  
Depth Direction ◽  
Confocal Scanning ◽  
Confocal Scanning Laser

Three-dimensional (3D) images consisting of arrays of voxels can now be routinely obtained from several different types of microscopes. These include both the transmission and emission modes of the confocal scanning laser microscope (but not its most common reflection mode), the secondary ion mass spectrometer, and computed tomography using electrons, X-rays or other signals. Compared to the traditional use of serial sectioning (which includes sequential polishing of hard materials), these newer techniques eliminate difficulties of alignment of slices, and maintain uniform resolution in the depth direction. However, the resolution in the z-direction may be different from that within each image plane, which makes the voxels non-cubic and creates some difficulties for subsequent analysis.

The Impact of Light Polarisation on Light Field of Scenes with Multiple Reflections

2020 ◽  
pp. 108-115 ◽  
Author(s):  
Vladimir P. Budak ◽  
Anton V. Grimaylo
Keyword(s):  
Mathematical Model ◽  
Light Field ◽  
Global Illumination ◽  
Multiple Reflections ◽  
Software Environment ◽  
The Monte Carlo Method ◽  
Mueller Matrices ◽  
Volume Integration ◽  
The Impact

The article describes the role of polarisation in calculation of multiple reflections. A mathematical model of multiple reflections based on the Stokes vector for beam description and Mueller matrices for description of surface properties is presented. On the basis of this model, the global illumination equation is generalised for the polarisation case and is resolved into volume integration. This allows us to obtain an expression for the Monte Carlo method local estimates and to use them for evaluation of light distribution in the scene with consideration of polarisation. The obtained mathematical model was implemented in the software environment using the example of a scene with its surfaces having both diffuse and regular components of reflection. The results presented in the article show that the calculation difference may reach 30 % when polarisation is taken into consideration as compared to standard modelling.

Modulation of the light field related to valve optical properties of raphid diatoms: implications for niche differentiation in the microphytobenthos

2018 ◽  
Vol 588 ◽  
pp. 29-42 ◽  
Author(s):  
JW Goessling ◽  
S Frankenbach ◽  
L Ribeiro ◽  
J Serôdio ◽  
M Kühl
Keyword(s):  
Optical Properties ◽  
Light Field ◽  
Niche Differentiation

Reconstruction of Smoke based on Light Field Consistency

2016 ◽  
Vol 136 (12) ◽  
pp. 522-531
Author(s):  
Yuta Ideguchi ◽  
Yuki Uranishi ◽  
Shunsuke Yoshimoto ◽  
Yoshihiro Kuroda ◽  
Masataka Imura ◽  
...  
Keyword(s):  
Light Field

Developments in 3D Echocardiography

2009 ◽  
Vol 5 (2) ◽  
pp. 10 ◽  
Author(s):  
Jose Luis Zamorano ◽  
Keyword(s):  
3D Echocardiography ◽  
Resonance Imaging ◽  
Clinical Tool ◽  
3D Images ◽  
Processing Power ◽  
2D Echocardiography ◽  
Automated Quantification ◽  
Heart Cycle ◽  
Functional Mechanisms ◽  
Full Volume

3D echocardiography (3DE) will gain increasing acceptance as a routine clinical tool as the technology evolves due to advances in technology and computer processing power. Images obtained from 3DE provide more accurate assessment of complex cardiac anatomy and sophisticated functional mechanisms compared with conventional 2D echocardiography (2DE), and are comparable to those achieved with magnetic resonance imaging. Many of the limitations associated with the early iterations of 3DE prevented their widespread clinical application. However, recent significant improvements in transducer and post-processing software technologies have addressed many of these issues. Furthermore, the most recent advances in the ability to image the entire heart in realtime and fully automated quantification have poised 3DE to become more ubiquitous in clinical routine. Realtime 3DE (RT3DE) systems offer further improvements in the diagnostic and treatment planning capabilities of cardiac ultrasound. Innovations such as the ability to acquire non-stitched, realtime, full-volume 3D images of the heart in a single heart cycle promise to overcome some of the current limitations of current RT3DE systems, which acquire images over four to seven cardiac cycles, with the need for gating and the potential for stitch artefacts.

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