Publications by Year: 2012

2012
Chen, N., Hong, K., Yeom, J., Jung, J. - H., & Lee, B. (2012). Experiment verification of hologram generation using intensity images. Proc. SPIE. 8559, Information Optics and Optical Data Storage II. Publisher's Version
Jung, J. - H., Hong, K., & Lee, B. (2012). Effect of Viewing Region Satisfying Super Multi-View Condition in Integral Imaging. SID Symposium Digest of Technical Papers . Blackwell Publishing Ltd. Publisher's VersionAbstract

We analyze viewing region satisfying super multi-view condition in integral imaging and evaluate the accommodation response when the observer is located inside and outside of the super multi-view region in integral imaging. To reveal the relation between the super multi-view condition and accommodation response of integral imaging, we perform the numerical analysis with super multi-view condition in integral imaging and present the experimental results of accommodation response using autorefractometer.

Park, S. -gi, Jung, J. - H., Kim, Y., & Lee, B. (2012). Depth-fused Display with Enhanced Viewing Region. Digital Holography and Three-Dimensional Imaging . Optical Society of America. Publisher's VersionAbstract
We propose a viewing region enhanced depth-fused display(DFD) system. Combination of multi-view rear image and transparent front image reduces the mismatching problem of conventional DFD system. We demonstrate the feasibility with experiment.
Jung, J. - H. (2012). Study on improvement of three-dimensional displays based on multi-view display and pinhole-type integral imaging. School of Electrical Engineering, Seoul National University.Abstract
This dissertation presents studies on improvement of three-dimensional (3D) displays based on multi-view display and pinhole-type integral imaging. Among various types of 3D displays, integral imaging and multi-view display such as parallax barrier and lenticular 3D display are almost commercialized autostereoscopic 3D display. For commercialization, autostereoscopic 3D display has three issues that are limitation of display technology, human factors related on human visual system and optical information processing technology. In this dissertation, the author will address the studies about the improvement methods for multi-view display and pinhole-type integral imaging in three issues. In the issue of display technology, the improvement methods of pinhole-type integral imaging using electroluminescent (EL) film and color filters on display panel are proposed to enhance the viewing angle, resolution, ray density and two-dimensional (2D)/3D convertibility. For large expressible depth range and 2D/3D convertibility in pinhole-type integral imaging, pinhole-type integral imaging is modified by new light source conversion layer based on EL film. The EL film has the advantage that it can operate continuously even when it is cut or punctured. Using this characteristic, the author generates an array of pinholes on an EL film to form a point light source array for reconstructing 3D images based on integral imaging. Taking advantage of the flexibility of EL films, a 2D/3D convertible integral imaging system with a wide viewing angle using a curved EL film is proposed which is extended to 360-degree viewable cylindrical 3D display system. For enhancement of ray density, resolution and expressible depth range in pinhole-type integral imaging, the system using color filter pinhole array on liquid crystal display panel with projection scheme is proposed. A color filter structure on liquid crystal display panel acts as pinhole array in integral imaging with separation of color channel. The use of color filter pinhole array and projection scheme can enlarge the region of one-elemental image and improve the resolution and ray density remarkably. In addition to the improvement of pinhole-type integral imaging, analysis and convergence of multi-view display and one-dimensional (1D) integral imaging are presented for improvement of characteristics in autostereoscopic display. For the convergence of two different autostereoscopic 3D display, multi-view display and integral imaging, light field analysis of spatio-angular distribution and its frequency domain analysis are performed. From the analysis, the convergence type of autostereoscopic 3D display based on multi-view display and 1D integral imaging is proposed by using time-multiplexing and sub-pixel multiplexing technique. On another issue in autostereoscopic 3D display, the depth resolution and accommodation response of human factors in multi-view display and integral imaging are researched. To find the effect of fundamental depth resolution and cardboard effect to the perceived depth resolution in multi-view display, the fundamental depth resolution and the cardboard effect from the synthesis process in the multi-view 3D TV broadcasting are analyzed and a subjective test is performed. In addition, the analysis and measurement of accommodation response of integral imaging with satisfying super multi-view display is performed to reveal the relation between the accommodation response of integral imaging and super multi-view condition. On the other issue of autostereoscopic 3D display, the optical information processing from elemental image and multi-view images in depth extraction and computational pickup method without pseudoscopic problem is presented. A more accurate depth extraction algorithm using optical flow from sub-images of elemental image is proposed and its applications are also presented in this dissertation.
Park, S. -gi, Jung, J. - H., Kim, J., Park, J. - H., & Lee, B. (2012). Analysis and improvement of the depth resolution in depth-fused display. The Second Japan-Korea Workshop on Digital Holography and Information Photonics . Optical Society of Japan.
Kim, J., Hong, J., Jung, J. - H., Hong, J. - Y., Moon, J., & Lee, B. (2012). Analysis of depth resolution in multi-view display. 12th International Meeting on Information Display (IMID 2012) . The Society for Information Display.
Park, S. -gi, Jung, J. - H., & Lee, B. (2012). Depth expansion of depth-fused display based on integral imaging method. 12th International Meeting on Information Display (IMID 2012) . The Society for Information Display.
Hong, J., Jung, J. - H., Hong, K., Kim, Y., & Lee, B. (2012). Method and system for imaging display. Korean Patent . KR Patent No. 10-1118745.
Jung, J. - H., Kim, J., Park, S. -gi, Choi, S., Nam, D., & Lee, B. (2012). Accommodation response of super multi-view display using directional light in monocular condition. 19th The International Display Workshop . Kyoto, Japan.
Kim, Y., Kim, J., Hong, K., Yang, H. K., Jung, J. - H., Choi, H., Min, S. - W., et al. (2012). Accommodative Response of Integral Imaging in Near Distance. J. Disp. Technol. , 8 70-78. Publisher's VersionAbstract

Objective evaluation results using optometric device to measure accommodative responses in viewing a real object and integral imaging are presented. From the empirical results between the real object and an integrated three-dimensional (3D) image, we find that over 73% of participants keep eyes on the real integrated 3D image instead of a display panel. The results also show the participants do not recognize a mismatch between the accommodative response and the convergence of the eye, which used to be believed as one of the major factors to cause visual fatigue in viewing near-distance integral imaging. Seventy-one normal adult subjects (23   38 years old) participated in the experiment, and accommodative response measurement results of the real integrated image show a statistically significant concordance with real objects.

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Kim, Y., Hong, K., Yeom, J., Hong, J., Jung, J. - H., Lee, Y. W., Park, J. - H., et al. (2012). A frontal projection-type three-dimensional display. Opt. Express , 20, 20130–20138 . OSA. Publisher's VersionAbstract

In a typical auto-stereoscopic three-dimensional display, the parallax barrier or lenticular lens is located in front of the display device. However, in a projection-type auto-stereoscopic display, such optical components make it difficult to display elemental images on the screen or to reconstruct a three-dimensional image, even though a projection-type display has many advantages. Therefore, it is necessary to use a rear projection technique in a projection-type auto-stereoscopic display, despite the fact that this is an inefficient use of space. We propose here a frontal projection-type auto-stereoscopic display by using a polarizer and a quarter-wave retarding film. Since the proposed method uses a frontal projection scheme and passive polarizing components, it has the advantage of being both space saving and cost effective. This is the first report that describes a frontal projection-type auto-stereoscopic display based on a parallax barrier and integral imaging by using a projector. Experimental results that support the proposed method are provided.

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Jung, J. - H., Park, S. -gi, Kim, Y., & Lee, B. (2012). Integral imaging using a color filter pinhole array on a display panel. Opt. Express , 20, 18744–18756 . OSA. Publisher's VersionAbstract
We propose methods of enhancing pinhole-type integral imaging ray density, resolution, and expressible depth range using a color filter pinhole array on a liquid crystal display panel with a projection scheme. A color filter structure on a liquid crystal display panel acts as pinhole array in integral imaging with separation of color channels. In conventional pinhole-type integral imaging, the resolution, viewing angle, and ray density are limited by the pinhole interval, the width and thickness of the pinhole structure, and the gap between the display panel and the pinhole array. To overcome the limitation of the pinhole interval, we use a color filter pinhole array on a display panel and a projection-type integral imaging scheme. The use of a color filter pinhole array and the projection scheme can enlarge the region of one elemental image and improve the resolution and ray density remarkably. This paper presents the experimental results of the proposed method and a comparison with conventional methods.
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Kim, J., Jung, J. - H., Hong, J., Yeom, J., & Lee, B. (2012). Elemental Image Generation Method with the Correction of Mismatch Error by Sub-pixel Sampling between Lens and Pixel in Integral Imaging. J. Opt. Soc. Korea , 16, 29–35 . OSA. Publisher's VersionAbstract

We propose a subpixel scale elemental image generation method to correct the errors created by finite display pixel size in integral imaging. In this paper, two errors are mainly discussed: pickup-and-display mismatch error and mismatch error between pixel pitch and lens pitch. The proposed method considers the relative positions between lenses and pixels in subpixel scale. Our proposed pickup method calculates the position parameters, generates an elemental image with pixels completely inside the lens, and generates an elemental image with border pixels using a weighted sum method. Appropriate experiments are presented to verify the validity of the proposed method.

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