Publications by Year: 2010

2010
Jung, J. - H., Hong, K., Park, J. - H., Chung, I., & Lee, B. (2010). Disparity estimation based on integral imaging in sub-pixel resolution using maximum a priori (MAP) registration. Proc. SPIE. 7797, Optics and Photonics for Information Processing IV. Publisher's Version
Kim, Y., Jung, J. - H., Hong, K., Park, G., & Lee, B. (2010). Accommodation Response in Viewing Integral Imaging. SID Symposium Digest of Technical Papers . Blackwell Publishing Ltd. Publisher's VersionAbstract

Visual discomfort has been the subject of considerable research in relation to stereoscopic and autostereoscopic displays. In this paper, the measurement of accommodation response in viewing integral imaging has been performed. Integral imaging is the three-dimensional display technology proposed by Lippmann which shows full parallax images and does not need any additional equipment. Recently the integral imaging system was rapidly improved thanks to the progress of flat panel displays such as liquid crystal display, however so far, no definitive answer has been given to the visual fatigue related with viewing integral imaging system. The measurement results indicate that the accommodation response was in proportion to the perceived depth in integral imaging just as when the observer views real objects. The accommodation response is concluded not to be fixed on the display panel, but to follow similar response as if the physical objects exist on each depth.

Hong, K., Jung, J. - H., Park, J. - H., & Lee, B. (2010). Accurate Lens Lattice Extraction in Distorted Elemental Image Set. Digital Holography and Three-Dimensional Imaging . Optical Society of America. Publisher's VersionAbstract
We propose an accurate lens lattice extraction in distorted elemental image set. Geometrical distortion in the elemental image set is recovered by using projective information. Experimental results show the lattice structures are extracted accurately.
Chung, I., Jung, J. - H., Hong, J., Hong, K., & Lee, B. (2010). Depth Extraction with Sub-Pixel Resolution in Integral Imaging Based on Genetic Algorithm. Digital Holography and Three-Dimensional Imaging . Optical Society of America. Publisher's VersionAbstract
We propose a new method of depth extraction in integral imaging with sub-pixel resolution. A genetic algorithm is employed to optimize the depth value through iteration with sub-pixel unit shift.
Kim, Y., Hong, K., Jung, J. - H., Hong, J., Lee, Y., Min, S. - W., & Lee, B. (2010). Enhanced Optical Depth Converter Based on Integral Imaging. Digital Holography and Three-Dimensional Imaging . Optical Society of America. Publisher's VersionAbstract
Improved optical depth converter by using a pair of curved lens array and convex mirror array is proposed. The proposed system is capable of orthoscopic/pseudoscopic image conversion with enhanced optical power efficiency.
Jung, J. - H., Kim, Y., Lee, Y., & Lee, B. (2010). Enhancement of Pinhole Type Integral Imaging System Using Color Filters of Liquid Crystal Display Panel. Digital Holography and Three-Dimensional Imaging . Optical Society of America. Publisher's VersionAbstract
In pinhole type integral imaging, the viewing angle and resolution are limited by pinhole interval. For enhancement of viewing angle and resolution, we propose the pinhole type integral imaging using color filters of LCD panel.
Chung, I., Jung, J. - H., Hong, J., Hong, K., & Lee, B. (2010). Reduction of quantization error in depth extraction based on integral imaging using genetic algorithm. 10th International Meeting on Information Display (IMID 2010) . The Society for Information Display.
Jung, J. - H., Kim, Y., Kim, S., & Lee, B. (2010). Stereoscopic view image generation based on the horopter. 16th International Display Workshops (IDW 2010) . The Society for Information Display.
Pham, D. - Q., Kim, N., Kwon, K. - C., Jung, J. - H., Hong, K., Lee, B., & Park, J. - H. (2010). Depth enhancement of integral imaging by using polymer-dispersed liquid-crystal films and a dual-depth configuration. Opt. Lett. , 35, 3135–3137 . OSA. Publisher's VersionAbstract
In spite of their many advantages, limited image depth still remains as an obstacle to three-dimensional displays based on integral imaging. In this Letter, by combining multiple polymer-dispersed liquid-crystal films and a dual-depth configuration, we propose a method to enhance the depth range of the integral imaging display system.
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Hong, K., Hong, J., Jung, J. - H., Park, J. - H., & Lee, B. (2010). Rectification of elemental image set and extraction of lens lattice by projective image transformation in integral imaging. Opt. Express , 18, 12002–12016 . OSA. Publisher's VersionAbstract
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.
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Choi, H. - J., Jung, J. - H., Kim, H., & Lee, B. - H. (2010). Analysis of the Motion Picture Quality of Stereoscopic Three-dimensional Images. J. Opt. Soc. Korea , 14, 383–387 . OSA. Publisher's VersionAbstract
The stereoscopic three-dimensional (3D) display provides a 3D image by inducing binocular disparity for the observers who wear special glasses. With the rapid progress in flat panel display technologies, the stereoscopic 3D display is becoming a new benefit-model of the current display industry, and several kinds of commercial stereoscopic 3D products have been released and are attracting people. Nowadays, the motion picture quality of the 3D image becomes as important as resolution or luminance since most of the commercial 3D products are 3D televisions or 3D monitors which are required to display a clear motion 3D image. In this paper, an analysis and simulation of the motion picture quality of stereoscopic 3D image is proposed, and a comparison of the motion picture performance among the current stereoscopic 3D technologies is also provided.
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Jung, J. - H., Hong, K., Park, G., Chung, I., Park, J. - H., & Lee, B. (2010). Reconstruction of three-dimensional occluded object using optical flow and triangular mesh reconstruction in integral imaging. Opt. Express , 18, 26373–26387 . OSA. Publisher's VersionAbstract
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.
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Jung, J. - H., Hong, K., Park, G., Chung, I., & Lee, B. (2010). 360°-viewable cylindrical integral imaging system using a 3-D/2-D switchable and flexible backlight. J. Soc. Inf. Disp. , 18, 527–534 . Blackwell Publishing Ltd. Publisher's VersionAbstract

Abstract— A 360°-viewable cylindrical three-dimensional (3-D) display system based on integral imaging has been implemented. The proposed system is composed of a cylindrically arranged electroluminescent (EL) pinhole film, an EL film backlight, a barrier structure, and a transmission-type flexible display panel. The cylindrically arranged point-light-source array, which is generated by the EL pinhole film reconstructs 360°-viewable virtual 3-D images at the center of the cylinder. In addition, the proposed system provides 3-D/2-D convertibility using the switching of EL pinhole film from a point light source to a surface light source. In this paper, the principle of operation, analysis of the viewing parameters, and the experimental results are presented.

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