http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Heo Daerak,Kim Beomjun,Lim Sungjin,Moon Woonchan,Lee Dongkil,Hahn Joonku 한국정보디스플레이학회 2023 Journal of information display Vol.24 No.1
Tabletop autostereoscopic displays have the advantage of displaying realistic three-dimensional (3D) content. In particular, the Integral imaging (InIm) method is superior in tabletop displays, as it is possible to make the system small using microlens arrays (MLA). Off-the-shelf MLAs have a small field of view (FOV) and are unsuitable for tabletop displays where the half viewing angle is typically around 45 degrees. The MLA for tabletop display also needs to have uniform angular resolution and low crosstalk to display 3D content. In this paper, we designed a new MLA with a multilayer structure and a reversed lens shape. This lens array has a wide viewing angle of −58 degrees to +58 degrees, with uniform angular resolution and low crosstalk of less than 0.2. We implemented a tabletop display using our MLA and verified its properties experimentally. The misallocation error of the elemental image is experimentally measured and compensated for as well.
Inverse conversion algorithm for an all-optical depth coloring camera
Lim, Sungjin,Heo, Daerak,Kim, Mugeon,Choi, Geunseop,Hahn, Joonku OSA OPTICAL SOCIETY OF AMERICA 2017 Applied Optics Vol.56 No.34
<P>Three-dimensional (3D) metrology has received a lot of attention from academic and industrial communities due to its broad applications, such as 3D contents, 3D printing, and autonomous driving. The all-optical depth coloring (AODC) camera has some benefits in computation load since it extracts depth information of an object fully optically. The AODC camera represents the depth of the object as a variation of wavelength, and spectroscopy is generally required to measure the wavelength. However, in the AODC camera, the color vector in RGB color space is convertible inversely into the wavelength after projection on the normalized rgb plane because the detected spectrum through the gating part has a narrow bandwidth as a result of the width of the slit in the projection part. In this paper, we propose an inverse conversion algorithm from RGB color to depth without spectroscopy. Experimental results are presented to confirm its feasibility. Also, some practical limitations are discussed, resulting from the nonlinearity of the response of the image sensor and the widths of the slits in the projection part and the gating part. (C) 2017 Optical Society of America</P>
Development of a scalable tabletop display using projection-based light field technology
Shim Hamong,Lee Dongkil,Park Jongbok,Yoon Seonkyu,Kim Hoemin,Kim Kwangsoo,Heo Daerak,Kim Beomjun,Hahn Joonku,Kim Youngmin,Jang Wongun 한국정보디스플레이학회 2021 Journal of information display Vol.22 No.4
We present a light-field display optical system design, state-of-the-art hardware technology, and computational software that are readily scalable (due to their modular structure) and provide naturally immersive and volumetric display systems. We explain the integration of 72 microprojectors into the tabletop display system. In addition, we used 6 workstations for all images and 18 highperformance graphics processing units. Sophisticated image generation through author tooling and the pixel re-arrangement algorithm in the Unity engine enabled us to produce complete threedimensional images from the radiant rays of two-dimensional pixels using diffuser screens and microlens arrays.