• Journal of information and communication convergence engineering
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• 제11권2호
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• pp.132-138
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• 2013

In this paper, an accelerated generation algorithm to effectively generate an elemental image array in computational integral imaging system is proposed. In the proposed method, the depth information of 3D object is extracted from the images picked up by a stereo camera or depth camera. Then, the elemental image array can be generated by using the proposed accelerated generation algorithm with the depth information of 3D object. The resultant 3D image generated by the proposed accelerated generation algorithm was compared with that the conventional direct algorithm for verifying the efficiency of the proposed method. From the experimental results, the accuracy of elemental image generated by the proposed method could be confirmed.

• 한국통신학회논문지
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• 제33권12C호
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• pp.1068-1074
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• 2008

본 논문에서는 컴퓨터적으로 생성하는 집적영상 시스템에서 룩업테이블(Look-up Table)을 사용해서 요소영상 배열을 효과적으로 생성하는 알고리즘을 제안한다. 이 알고리즘은 물체의 점이 픽업 면에 투영되는 위치를 찾기 위해서 x와 y의 투영 점에 대해서 서로 독립적인 룩업테이블을 작성하고 이를 사용해서 요소영상 배열을 생성하는 계산 속도를 개선하였다. 제안된 알고리즘과 기존 알고리즘들의 계산 시간을 실험을 통해서 비교한 결과 제안 된 알고리즘이 더 효율적임을 증명하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권5호
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• pp.2273-2286
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• 2018

This paper describes transformations between elemental image arrays and a RGBD image for three-dimensional integral imaging and transmitting systems. Two transformations are introduced and analyzed in the proposed method. Normally, a RGBD image is utilized in efficient 3D data transmission although 3D imaging and display is restricted. Thus, a pixel-to-pixel mapping is required to obtain an elemental image array from a RGBD image. However, transformations and their analysis have little attention in computational integral imaging and transmission. Thus, in this paper, we introduce two different mapping methods that are called as the forward and backward mapping methods. Also, two mappings are analyzed and compared in terms of complexity and visual quality. In addition, a special condition, named as the hole-free condition in this paper, is proposed to understand the methods analytically. To verify our analysis, we carry out experiments for test images and the results indicate that the proposed methods and their analysis work in terms of the computational cost and visual quality.

• Journal of the Optical Society of Korea
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• 제18권6호
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• pp.706-713
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• 2014

An enhanced 360-degree integral-floating three-dimensional display system using a hexagonal lens array and a hidden point removal operator is proposed. Only the visible points of the chosen three-dimensional point cloud model are detected by the hidden point removal operator for each rotating step of the anamorphic optics system, and elemental image arrays are generated for the detected visible points from the corresponding viewpoint. Each elemental image of the elemental image array is generated by a hexagonal grid, due to being captured through a hexagonal lens array. The hidden point removal operator eliminates the overlap problem of points in front and behind, and the hexagonal lens array captures the elemental image arrays with more accurate approximation, so in the end the quality of the displayed image is improved. In an experiment, an anamorphic-optics-system-based 360-degree integral-floating display with improved image quality is demonstrated.

• 한국통신학회논문지
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• 제33권11C호
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• pp.898-904
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• 2008

본 논문에서는 컴퓨터적으로 생성하는 집적영상 시스템에서 요소영상 배열을 생성하기 위한 새로운 fast 알고리즘을 제안한다. 이 알고리즘은 깊이 정보를 사용해서 요소영상 배열을 생성하며, 경계 영역 개념을 도입하여 경계영역 내에 있는 복셀에 대해서만 연산을 수행하여 알고리즘의 계산 속도를 개선하였다. 제안된 알고리즘과 기존 알고리즘의 계산 시간을 이론적 및 실험적으로 비교한 결과 제안된 알고리즘이 더 효율적임을 증명하였다.

• Journal of the Optical Society of Korea
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• 제20권3호
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• pp.363-367
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• 2016

In this paper, we present a resolution-enhanced computational integral imaging reconstruction method by using boundary folding mirrors. In the proposed method, to improve the resolution of the computationally reconstructed 3D images, the direct and reflected light information of the 3D objects through a lenslet array with boundary folding mirrors is recorded as a combined elemental image array. Then, the ray tracing method is employed to synthesize the regular elemental image array by using a combined elemental image array. From the experimental results, we can verify that the proposed method can improve the visual quality of the computationally reconstructed 3D images.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.I
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• pp.41-45
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• 2005

A new algorithm of the image mapping which is a technique of the elemental image generation is proposed. The proposed method is based on the characteristics of the lens array such as the number, the size and the focal length of the elemental lens. The 3D image generated by 3D graphic API such as OpenGL can be directly adopted without the complex adaptation. Since the image mapping using the proposed method can enhance the speed of the elemental image generation, the computer- generated integral imaging system can be applied to virtual reality system.

• 한국정보통신학회논문지
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• 제15권5호
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• pp.1164-1170
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• 2011

본 논문에서는 컴퓨터 집적 영상에서의 정교한 요소 영상 추출 및 전처리 기술에 대해 제안한다. 전처리 기술은 영상 복원 과정 전에 영상의 왜곡 및 잡음을 제거하는 기술이다. 픽업 과정에서 발생된 왜곡 및 잡음은 주로 회전 왜곡으로, 복원된 영상의 화질을 저하시킨다. 이 문제점을 극복하기 위해서 요소 영상 추출 및 전처리 방법을 제안하고, 이를 통하여 왜곡 및 잡음이 영상 복원 과정에 미치는 영향에 대해서 설명하였다. 광학 및 컴퓨터 실험을 통하여 교정 전, 후의 복원 영상의 특성을 비교하였다.

• ETRI Journal
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• 제27권6호
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• pp.708-712
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• 2005

We propose a computational reconstruction technique in large-depth integral imaging where the elemental images have information of three-dimensional objects through real and virtual image fields. In the proposed technique, we reconstruct full volume information from the elemental images through both real and virtual image fields. Here, we use uniform mappings of elemental images with the size of the lenslet regardless of the distance between the lenslet array and reconstruction image plane. To show the feasibility of the proposed reconstruction technique, we perform preliminary experiments and present experimental results.

• 한국멀티미디어학회논문지
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• 제19권3호
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• pp.548-556
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• 2016

Integral imaging is an auto-stereoscopic display method that can produce 3D image of a finite viewing window through an array of micro elemental lenses. Integral imaging requires the pickup part of each elemental images acquisition and display part of reconstruction of the images. The successful reconstructed image depends on various parameters such as distance between lens arrays and display device, focal length of lenses, and a number of the array. In this paper, we present reconstruction emulator for display of Integral imaging in order to adjust parameters for 3D contents reconstruction and to observe the result from different configuration. Especially, we provide the user interface for the emulator to control the distance easily. We have confirmed through various experiments that the emulator adjusted the distance and could check error in the process of creating elemental images.