A5078869531- Advanced Optical Imaging Technologies
- Virtual Reality Applications and Impacts
- Image Enhancement Techniques
- Advanced Vision and Imaging
- Computer Graphics and Visualization Techniques
- Image and Signal Denoising Methods
- Photorefractive and Nonlinear Optics
- Advanced Image Fusion Techniques
- Image and Video Stabilization
- Advanced Image Processing Techniques
- Digital Holography and Microscopy
- Interactive and Immersive Displays
- Color Science and Applications
- Advanced Optical Sensing Technologies
- Visual perception and processing mechanisms
- Tactile and Sensory Interactions
- Risk and Safety Analysis
- Ophthalmology and Visual Impairment Studies
- Marine and Coastal Research
- Evacuation and Crowd Dynamics
- Sparse and Compressive Sensing Techniques
- Atmospheric aerosols and clouds
- Advanced optical system design
- Photoacoustic and Ultrasonic Imaging
- 3D Surveying and Cultural Heritage
Seoul National University
2010-2024
Keimyung University
2024
Yonsei University
2015-2022
Stanford University
2021
Nvidia (United States)
2017-2021
Nvidia (United Kingdom)
2021
Chosun University
2017
Korea University
2015
LG (United States)
2006
Holographic near-eye displays promise unprecedented capabilities for virtual and augmented reality (VR/AR) systems. The image quality achieved by current holographic displays, however, is limited the wave propagation models used to simulate physical optics. We propose a neural network-parameterized plane-to-multiplane model that closes gap between physics simulation. Our automatically trained using camera feedback it outperforms related techniques in 2D plane-to-plane settings large margin....
We present a new optical design for see-through near-eye displays that is simple, compact, varifocal, and provides wide field of view with clear peripheral vision large eyebox. Key to this effort novel rear-projection screen. project an image the screen using off-axis path, which then relayed user's eyes through on-axis partially-reflective magnifying surface. Converting path compact imaging simplifies design. establish fundamental trade-offs between quantitative parameters resolution, view,...
We introduce an approach to implementation of see-through head-mounted displays using hologram lenses, which are categorized by holographic optical elements. The lenses magnify displayed images and superimpose the magnified on real-world simultaneously, allows system configuration be compact. Here, we investigate imaging properties issues spectral analysis light field. Also, astigmatism is analyzed its compensation method proposed verified. conclude describing display results a practical...
We introduce HyperCLOVA X, a family of large language models (LLMs) tailored to the Korean and culture, along with competitive capabilities in English, math, coding. X was trained on balanced mix Korean, code data, followed by instruction-tuning high-quality human-annotated datasets while abiding strict safety guidelines reflecting our commitment responsible AI. The model is evaluated across various benchmarks, including comprehensive reasoning, knowledge, commonsense, factuality, coding,...
We propose a real-time capturing and 3D visualization method based on integral imaging. applied conversion algorithm to conventional imaging pickup system. Gap control with depth plane adjustment is also improve image quality. Implemented system provides images ultra high definition resolution in 20 frames per second, the observer can change planes freely. Simulations experimental results show validity of proposed
In recent years, red, green, blue, and white (RGBW) color filter arrays (CFAs) have been developed to solve the problem of low-light conditions. this paper, we propose a new demosaicing algorithm for RGBW CFAs using Laplacian pyramid. Because channel has high correlation blue channels, is interpolated first each difference channel. After estimate channel, channels are pyramid decomposition estimated Our proposed method restoration works with Canon-RGBW any other periodic CFAs. The...
Increasing resolution and dynamic range of digital color displays is challenging with designs confined by cost power specifications. This necessitates modern to trade-off spatial temporal for reproduction capability. In this work we explore the idea joint hardware algorithm design balance such trade-offs. We introduce a system that uses content-adaptive compressive factorizations reproduce colors. Each target frame factorized into two products high-resolution monochromatic low-resolution...
Image deconvolution is an ill-posed problem that usually requires prior knowledge for regularizing the feasible solutions. In literature, iterative methods estimate intrinsic image, minimizing a cost function regularized by specific information. However, it difficult to directly minimize constrained function, if nondifferentiable regularization (e.g., sparsity constraint) employed. this paper, we propose nonderivative image algorithm solves under-constrained (i.e., non-blind deconvolution)...
An auto-stereoscopic three-dimensional (3D) display, which has a diamond pixel structured pentile display panel and selectively operates in both landscape portrait mode, is composed by using the detachable parallax barrier film.
Recently, a CFA sensor including W channel has been developed. Since the receives brightness information, it broad spectrum band compared to primary colors (Red, Green, Blue) and exhibits high SNR. A camera using obtains only certain type of color information for each pixel, so interpolation method is used restore full resolution image. In this paper, we propose new Sony-RGBW CFA. The proposed edge-adaptive preferentially restores with sampling rate. next step, R, G, B channels are restored...
We propose a novel real-time pickup and display of integral imaging system using only lens array high speed charge coupled device (CCD). A simple CCD can capture 3D information the object commercial liquid crystal (LC) panel shows elemental image in real-time. Reconstructed is real orthographic so that observer touch image. Furthermore, our free from pseudoscopic problem by adopting recent pixel mapping algorithm. This algorithm, based on interweaving process, also change depth plane...
We propose a hybrid signed distance field (SDF) method for reconstructing the detailed surface of model as it changes from solid state to liquid state. Previous particle-based fluid simulations suffer noisy problem when particles are distributed irregularly. If smoothing scheme is applied reduce problem, sharp and features can be lost by over-smoothing artifacts. Our constructs SDF combining level-set values parts object. This makes possible represent smooth surfaces an object both mixed in...
In this paper, we propose the see-through parallax barrier type multi-view display with transparent liquid crystal (LCD). The transparency of LCD is realized by detaching backlight unit. number views in proposed system minimized to enlarge aperture size barrier, which determines transparency. For compensating shortness viewpoints, eye tracking method applied provide large and vertical parallax. Through experiments, a prototype autostereoscopic 3D implemented, parameters transmittance,...
We propose a novel calibration method which can be applied to all kinds of panel-type multi-view displays. analyze how the angular, axial, and lateral misalignment affects 3D image quality in display. demonstrate ray optics simulation with 3-view slanted parallax barrier system using pentile display for quantitative calculation. Based on analysis, we new alignment pattern The proposed is sensitive misalignments. high spatial frequency images off help observers calibrate easily. theoretically...
In this paper, we propose a color interpolation algorithm for red-white-blue (RWB) filter array (CFA) that uses double exposed white channel instead of single green (G) channel. The double-exposed RWB CFA pattern, which captures two channels at different exposure times simultaneously, improves the sensitivity and provides solution rapid saturation problem W although spatial resolution is degraded due to lack suitable algorithm. proposed designed optimized pattern. Two are interpolated by...
Introduction: Altered oxidation/reduction, homeostasis, and inflammation appear to be hallmarks of potential cell damage consequent functional disruption. HH711, a traditional Korean herbal medicine consisting Rhus vernicifluae Cortex (RV) as the main ingredient, has been used in Korea treat chronic fatigue, stress, indigestion, common cold.
In this paper, we present a table-top 3D display using integral floating technology to make static-type system. Because the proposed system does not use rotating devices, it has several advantages over conventional displays such as stability and static feature. We analyze viewing characteristics pickup process of by ray optics an experimental setup verify our idea.
In this study, Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP)-based lithium metal battery (LMB) cells are prepared using two different protection layers against metal: a solid polymer electrolyte (SPE) containing polyethylene oxide and bis(fluorosulfonyl)imide (LiTFSI), composite (CPE) filled with 14 wt% 6.4 La Zr 1.4 Ta 0.6 O 12 (LLZTO). The CPE-containing symmetric cell exhibits smaller overvoltage than that of its SPE-containing counterpart, which is maintained for ∼1000 h at 0.1 mA·cm −2 60 °C,...
Summary Well placement optimization problem has large, discrete, and non-smooth solution search space. To address the issues, many techniques have been applied to well optimization. In this research, authors formulate given as a Markov decision process apply Deep Q-Network (DQN). optimization, state is defined pressure oil saturation distribution, location. The action placing production in reservoir, reward net present value for each time segment. Both replay memory prioritized experience...
AI does not embody human intellectual capabilities, but rather aims to perform tasks that humans have been performing using intelligence. Today, it is difficult imagine an judge identical a judge. Only when the results presented by algorithms replace judgment of judges can they be called judges. are discussed in context improving work efficiency and expectations for consistency fairness trials, there various constitutional issues. In particular, whether right fair trial or equality may...
It was shown in this study that the gap control method, a solution for color separation problem integral imaging, could be implemented not only by making lens array closer than focal length but also it farther length. Besides, analysis done comparing two methods through simulation and experimentation. verified is eliminated using criteria reduction of were given analyzing spatial frequency. The results suggest expressible depth range generally superior when real-type method adopted....
Three-dimensional (3D) display has attracted considerable attention in recent years because of development technology. Various methods for realizing 3D have been proposed; among them, multi-view could be practical to implement before aspiring display. The term system based on autostereoscopic the meaning view splitting; images are projected pre-defined positions from same device. Therefore users located at correct can see corresponding images. Although technique studied by many research...
An increasingly important part of usuable near-eye displays to allow use by users who vision correction such as that provided glasses and contact lenses. Recent research indicates over 20% world population is myopic, this percentage increasing [Holden et al. 2016]. Commercial prototypes have offered an additional prescription lens pair or a glasses-compatible design, but both these approaches increase the size weight device. Ideally, user's should be considered from optical design stage for...
In this paper, we propose a multi-frame depth super-resolution (SR) method based on L <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> data fidelity with the total variation regularization (TV-L ) model. The majority of time-of-flight (ToF) sensors exhibit limited spatial resolution compared to RGB and improvement image is an inherently ill-posed problem. To overcome under-determined problem, solution space by term through prior knowledge...