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Hong, Keehoon,Hong, Jisoo,Jung, Jae-Hyun,Park, Jae-Hyeung,Lee, Byoungho The Optical Society 2010 Optics express Vol.18 No.11
<P>We propose a new method for rectifying a geometrical distortion in the elemental image set and extracting an accurate lens lattice lines by projective image transformation. The information of distortion in the acquired elemental image set is found by Hough transform algorithm. With this initial information of distortions, the acquired elemental image set is rectified automatically without the prior knowledge on the characteristics of pickup system by stratified image transformation procedure. Computer-generated elemental image sets with distortion on purpose are used for verifying the proposed rectification method. Experimentally-captured elemental image sets are optically reconstructed before and after the rectification by the proposed method. The experimental results support the validity of the proposed method with high accuracy of image rectification and lattice extraction.</P>
Jung, Jae-Hyun,Kim, Yunhee,Kim, Youngmin,Kim, Joohwan,Hong, Keehoon,Lee, Byoungho Optical Society of America 2009 Applied Optics Vol.48 No.5
<P>We propose a thin and compact integral imaging system using electroluminescent (EL) films as backlight. EL film has the advantage that it can operate continuously even when it is cut or punctured. Using this characteristic, we generate an array of pinholes on EL film to form a point light-source array for reconstructing three-dimensional (3D) images based on integral imaging. The EL pinhole film is attached on another EL film and they are electrically controlled to generate a point light-source array or a surface light source; hence, the system converts between 3D and two-dimensional (2D) modes. Taking advantage of the flexibility of EL films, we also propose a flexible 3D/2D convertible integral imaging system with a wide viewing angle using a curved EL film. We explain the principle of the proposed methods and present experimental results.</P>
Jeon, Bong-Hyun,Jang, Cholsoon,Han, Jinah,Kataru, Raghu P.,Piao, Lianhua,Jung, Keehoon,Cha, Hye Ji,Schwendener, Reto A.,Jang, Kyu Yun,Kim, Kwan-Sik,Alitalo, Kari,Koh, Gou Young American Association for Cancer Research 2008 Cancer Research Vol.68 No.4
<P>Severe ascites is a hallmark of advanced ovarian cancer (OVCA), yet the underlying mechanism that creates an imbalance between peritoneal vascular leakage and lymphatic drainage is unknown. Here, we identified and characterized peritoneal lymphatic vessels in OVCA mice, a model generated by implantation of human OVCA cells into athymic nude mice. The OVCA mice displayed substantial lymphangiogenesis and lymphatic remodeling, massive infiltration of CD11b(+)/LYVE-1(+) macrophages and disseminated carcinomatosis in the mesentery and diaphragm, and progressive chylous ascites formation. Functional assays indicated that the abnormally abundant lymphatic vessels in the diaphragm were not conductive in peritoneal fluid drainage. Moreover, lipid absorbed from the gut leaked out from the aberrant mesenteric lymphatic vessels. Our results indicate that vascular endothelial growth factor (VEGF)-C, VEGF-D, and VEGF-A from CD11b(+) macrophages are responsible for producing OVCA-induced dysfunctional lymphangiogenesis, although other cell types contribute to the increased ascites formation. Accordingly, the combined blockade of VEGF-C/D and VEGF-A signaling with soluble VEGF receptor-3 and VEGF-Trap, respectively, markedly inhibited chylous ascites formation. These findings provide additional therapeutic targets to ameliorate chylous ascites formation in patients with advanced OVCA.</P>
Jung, Jae-Hyun,Hong, Keehoon,Park, Gilbae,Chung, Indeok,Park, Jae-Hyeung,Lee, Byoungho Optical Society of America 2010 Optics express Vol.18 No.25
<P>We proposed a reconstruction method for the occluded region of three-dimensional (3D) object using the depth extraction based on the optical flow and triangular mesh reconstruction in integral imaging. The depth information of sub-images from the acquired elemental image set is extracted using the optical flow with sub-pixel accuracy, which alleviates the depth quantization problem. The extracted depth maps of sub-image array are segmented by the depth threshold from the histogram based segmentation, which is represented as the point clouds. The point clouds are projected to the viewpoint of center sub-image and reconstructed by the triangular mesh reconstruction. The experimental results support the validity of the proposed method with high accuracy of peak signal-to-noise ratio and normalized cross-correlation in 3D image recognition.</P>
Jung, Jae-Hyun,Yeom, Jiwoon,Hong, Jisoo,Hong, Keehoon,Min, Sung-Wook,Lee, Byoungho Optical Society of America 2011 Optics express Vol.19 No.21
<P>In three-dimensional television (3D TV) broadcasting, we find the effect of fundamental depth resolution and the cardboard effect to the perceived depth resolution on multi-view display is important. The observer distance and the specification of multi-view display quantize the expressible depth range, which affect the perception of depth resolution of the observer. In addition, the multi-view 3D TV needs the view synthesis process using depth image-based rendering which induces the cardboard effect from the relation among the stereo pickup, the multi-view synthesis and the multi-view display. In this paper, we analyze the fundamental depth resolution and the cardboard effect from the synthesis process in the multi-view 3D TV broadcasting. After the analysis, the numerical comparison and subjective tests with 20 participants are performed to find the effect of fundamental depth resolution and the cardboard effect to the perceived depth resolution.</P>