• Title/Summary/Keyword: elemental image

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Free-view Pixels of Elemental Image Rearrangement Technique (FPERT)

  • Lee, Jaehoon;Cho, Myungjin;Inoue, Kotaro;Tashiro, Masaharu;Lee, Min-Chul
    • Journal of information and communication convergence engineering
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    • v.17 no.1
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    • pp.60-66
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    • 2019
  • In this paper, we propose a new free-view three-dimensional (3D) computational reconstruction of integral imaging to improve the visual quality of reconstructed 3D images when low-resolution elemental images are used. In a conventional free-view reconstruction, the visual quality of the reconstructed 3D images is insufficient to provide 3D information to applications because of the shift and sum process. In addition, its processing speed is slow. To solve these problems, our proposed method uses a pixel rearrangement technique (PERT) with locally selective elemental images. In general, PERT can reconstruct 3D images with a high visual quality at a fast processing speed. However, PERT cannot provide a free-view reconstruction. Therefore, using our proposed method, free-view reconstructed 3D images with high visual qualities can be generated when low-resolution elemental images are used. To show the feasibility of our proposed method, we applied it to optical experiments.

Research on the Development of an Integral Imaging System Framework and an Improved Viewpoint Vector Rendering Method Utilizing GPU (GPU를 이용한 개선된 뷰포인트 벡터 렌더링 방식의 집적영상시스템 프레임워크에 관한 연구)

  • Lee, Bin-Na-Ra;Park, Kyoung-Shin;Cho, Yong-Joo
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.10 no.10
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    • pp.1767-1772
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    • 2006
  • Computer-generated integral imaging system is an auto-stereoscopic display system that users can see and feel the stereoscopic images when they see the pre-rendered elemental images through a lens array. The process of constructing elemental images using computer graphics is called image mapping. Viewpoint vector rendering (VVR) method is one of the image mapping algorithm specially designed for real-time graphics applications, which would not be affected by the size of the rendered objects or the number of elemental lenses used in the integral imaging system. This paper describes a new VVR framework which improved its rendering performance considerably. It also compares the previous VVR implementation with the new VVR work utilizing GPU and shows that newer implementation shows pretty big improvements over the old method.

Three-Dimensional Visualization Technique of Occluded Objects Using Integral Imaging with Plenoptic Camera

  • Lee, Min-Chul;Inoue, Kotaro;Tashiro, Masaharu;Cho, Myungjin
    • Journal of information and communication convergence engineering
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    • v.15 no.3
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    • pp.193-198
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    • 2017
  • In this study, we propose a three-dimensional (3D) visualization technique of occluded objects using integral imaging with a plenoptic camera. In previous studies, depth map estimation from elemental images was used to remove occlusion. However, the resolution of these depth maps is low. Thus, the occlusion removal accuracy is not efficient. Therefore, we use a plenoptic camera to obtain a high-resolution depth map. Hence, individual depth map for each elemental image can also be generated. Finally, we can regenerate a more accurate depth map for 3D objects with these separate depth maps, allowing us to remove the occlusion layers more efficiently. We perform optical experiments to prove our proposed technique. Moreover, we use MSE and PSNR as a performance metric to evaluate the quality of the reconstructed image. In conclusion, we enhance the visual quality of the reconstructed image after removing the occlusion layers using the plenoptic camera.

Analysis of Off-axis Integral Floating System Using Concave Mirror

  • Kim, Young Min;Jung, Kwang-Mo;Min, Sung-Wook
    • Journal of the Optical Society of Korea
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    • v.16 no.3
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    • pp.270-276
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    • 2012
  • An off-axis integral floating system using a concave mirror is analyzed to resolve the image distortion incurred by the off-axis optical arrangement. The concave mirror can be adopted as the floating device to improve the optical efficiency. The image distortion due to the tilting axis of the concave mirror needs to be analyzed precisely to generate the pre-distortion image. In this paper, we calculate the image deformation in the off-axis structure of the concave mirror using the geometrical optics. Using the calculation results, the compensated elemental image can be generated for the pre-distortion integrated image, which can be projected to the floating 3D image without image distortion. The basic experiments of the off-axis integral floating are presented to prove and verify the proposal.

Optical implementation of unidirectional integral imaging based on pinhole model (핀홀 모델 기반의 1차원 집적 영상 기법의 광학적 구현)

  • Shin, Dong-Hak;Kim, Nam-Woo;Lee, Joon-Jae
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.11 no.2
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    • pp.337-343
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    • 2007
  • Since three-dimensional (3D) images reconstructed in interval imaging technique are related to the resolution of elemental images, there has been a problem that ray information of elemental images increases largely in order to obtain high-resolution 3D images. In this paper, to overcome this problem, a new unidirectional integral imaging based on pinhole model is proposed. Proposed method provides a new type of unidirectional elemental images, which are simply obtained by magnifying single horizontal pixel line of each elemental image to the vertical size of lenslet using ray analysis based on pinhole model and used to display 3D images. In proposed method, reduction effect of the ray information of elemental images can be obtained by scarifying vortical parallax. Feasibility of the proposed scheme is experimentally demonstrated and its results are presented.

Improved Recognition of Far Objects by using DPM method in Curving-Effective Integral Imaging (커브형 집적영상에서 부분적으로 가려진 먼 거리 물체 인식 향상을 위한 DPM 방법)

  • Chung, Han-Gu;Kim, Eun-Soo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.37 no.2A
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    • pp.128-134
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    • 2012
  • In this paper, we propose a novel approach to enhance the recognition performance of a far and partially occluded three-dimensional (3-D) target in computational curving-effective integral imaging (CEII) by using the direct pixel-mapping (DPM) method. With this scheme, the elemental image array (EIA) originally picked up from a far and partially occluded 3-D target can be converted into a new EIA just like the one virtually picked up from a target located close to the lenslet array. Due to this characteristic of DPM, resolution and quality of the reconstructed target image can be highly enhanced, which results in a significant improvement of recognition performance of a far 3-D object. Experimental results reveal that image quality of the reconstructed target image and object recognition performance of the proposed system have been improved by 1.75 dB and 4.56% on the average in PSNR (peak-to-peak signal-to-noise ratio) and NCC (normalized correlation coefficient), respectively, compared to the conventional system.

Enhanced Coding Method by Remapping of Integral Images (집적 영상 재배치를 통한 부호화효율 향상 방법)

  • Kim, Su-Bin;Kang, Hyun-Soo
    • The Journal of the Korea Contents Association
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    • v.15 no.2
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    • pp.1-10
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    • 2015
  • In this paper, we propose an integral image compression method to improve the coding efficiency. As the characteristics of integral images are various according to the distance between a camera and objects, complexity of the objects and background, etc, the coding efficiency can be improved by applying a coding method adaptive to the characteristics. In addition, as the integral images are compressed by the unit of elemental images, the coding efficiency can be improved. by employing a coding method optimized to the coding direction of elemental images. Therefore, the proposed method remaps an integral image with six kinds of mapping rules, and then the conventional 3D-DCT based compression method is applied to the remapped images. Finally, we perform the rate-distortion optimization to choose the best of the mapping rules. Experimental results show that the proposed method yields high gains in image quality and bit-rate.

Computational integral imaging with enhanced depth sensitivity

  • Baasantseren, Ganbat;Park, Jae-Hyeung;Kim, Nam
    • 한국정보디스플레이학회:학술대회논문집
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    • 2008.10a
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    • pp.718-721
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    • 2008
  • Novel computational integral imaging technique with enhanced depth sensitivity is proposed. For each lateral position at a given depth plane, the dissimilarity between corresponding pixels of the elemental images is measured and used as a suppressing factor for that position. Experimental and simulation results show that reconstructed depth image on the incorrect depth plane is effectively suppressed.

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Effect of elemental image conversion on the size, viewing angle, and depth of reconstructed image in the integral Imaging (집적결상에서 기본영상의 변환이 재생상의 크기, 깊이감, 시야각에 미치는 영향)

  • 박세희;장재영;서장일;차성도;신승호
    • Proceedings of the Optical Society of Korea Conference
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    • 2003.07a
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    • pp.268-269
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    • 2003
  • 집적 결상에서 기본영상의 이동 또는 크기 변화 등은 재생광학계의 정렬 오차 또는 재생상 개선을 위한 의도적 변환 때문에 나타난다. 기본 영상의 변환이 재생영상에 미치는 영향에 대한 연구는 집적결상계의 성능 평가에 필수적이다. 본 논문에서는 기본영상의 확대와 축소 변환이 재생영상의 크기와 시야각, 깊이감에 미치는 영향에 대해 연구하였다.

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