• Title/Summary/Keyword: 3D imaging

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An Investigation into Three Dimensional Mutable 'Living' Textile Materials and Environments(1) (3D 가상 이미지의 텍스타일 소재로의 적용을 통한 삼차원 변형가능한 'Living Textile'과 환경변화에 관한 연구(1))

  • Kim, Ki-Hoon;Suh, Ji-Sung
    • The Research Journal of the Costume Culture
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    • v.18 no.6
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    • pp.1305-1317
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    • 2010
  • This research aim concerns questioning how we can generate environments suggestive of nature fused with built environments through textiles. Through literature reviews and experiments with available the 3D imaging techniques of Holography, Lenticular and other new technologies, We have researched towards finding the most effective method for 3D imaging techniques for textile applications. This objective is to produce intriguing textile patterns and images in which the objects and colours change as viewpoints change. Experimental work was carried out in collaboration with professional textile researchers, scientists, artists and designers conducting research in this field.

A Novel 3-D Imaging Configuration Exploiting Synthetic Aperture Ladar

  • Guo, Liang;Huang, Yinli;Li, Xiaozhen;Zeng, Xiaodong;Tang, Yu;Xing, Mengdao
    • Current Optics and Photonics
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    • v.1 no.6
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    • pp.598-603
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    • 2017
  • Traditional three-dimensional (3-D) laser imaging systems are based on real aperture imaging technology, whose resolution decreases as the range increases. In this paper, we develop a novel 3-D imaging technique based on the synthetic aperture technology in which the imaging resolution is significantly improved and does not degrade with the increase of the range. We consider an imaging laser radar (ladar) system using the floodlight transmitting mode and multi-beam receiving mode. High 3-D imaging resolutions are achieved by matched filtering the linear frequency modulated (LFM) signals respectively in range, synthetic aperture along-track, and the real aperture across-track. In this paper, a novel 3-D imaging signal model is given first. Because of the motion during the transmission of a sweep, the Doppler shift induced by the continuous motion is taken into account. And then, a proper algorithm for the 3-D imaging geometry is given. Finally, simulation results validate the effectiveness of the proposed technique.

Three-Dimensional Imaging and Display through Integral Photography

  • Navarro, Hector;Dorado, Adrian;Saavedra, Genaro;Corral, Manuel Martinez
    • Journal of information and communication convergence engineering
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    • v.12 no.2
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    • pp.89-96
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    • 2014
  • Here, we present a review of the proposals and advances in the field of three-dimensional (3D) imaging acquisition and display made in the last century. The most popular techniques are based on the concept of stereoscopy. However, stereoscopy does not provide real 3D experience, and produces discomfort due to the conflict between convergence and accommodation. For this reason, we focus this paper on integral imaging, which is a technique that permits the codification of 3D information in an array of 2D images obtained from different perspectives. When this array of elemental images is placed in front of an array of microlenses, the perspectives are integrated producing 3D images with full parallax and free of the convergence-accommodation conflict. In the paper we describe the principles of this technique, together with some new applications of integral imaging.

The CGH in the Electro-holographic system using the Bragg type AOSLM (Bragg type 음향광변조기를 채택한 Electro-holographic system에서의 computer generated Fresnel hologram의 구현)

  • ;;;;Tru Thi Van Anh
    • Proceedings of the Optical Society of Korea Conference
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    • 2002.07a
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    • pp.142-143
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    • 2002
  • KIST에서는 Pulsed Laser를 사용하여 3차원 image를 재생할 수 있는 Electro-Holographic System을 만들어 CGH이미지를 구현하였다. CGH 이미지를 구현하기 위한 SLM (Spatial Light Modulator)으로 TeO$_2$ 결정의 Shear Mode 에서 동작하는 Bragg type의 다채널 AOSLM(Acousto-optic Spatial Light Modulator)이 사용되었다. 이 Bragg type 다채널 AOSLM에서는 광원이 특정 Bragg 각도로 입사하였을 때 다른 고위 차수는 억압되고 +나 -의 첫번째 차수의 회절 빔만이 형성된다. (중략)

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Integral Imaging Monitors with an Enlarged Viewing Angle

  • Dorado, Adria;Saavedra, Genaro;Sola-Pikabea, Jorge;Martinez-Corral, Manuel
    • Journal of information and communication convergence engineering
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    • v.13 no.2
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    • pp.132-138
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    • 2015
  • Enlarging the horizontal viewing angle is an important feature of integral imaging monitors. Thus far, the horizontal viewing angle has been enlarged in different ways, such as by changing the size of the elemental images or by tilting the lens array in the capture and reconstruction stages. However, these methods are limited by the microlenses used in the capture stage and by the fact that the images obtained cannot be easily projected into different displays. In this study, we upgrade our previously reported method, called SPOC 2.0. In particular, our new approach, which can be called SPOC 2.1, enlarges the viewing angle by increasing the density of the elemental images in the horizontal direction and by an appropriate application of our transformation and reshape algorithm. To illustrate our approach, we have calculated some high-viewing angle elemental images and displayed them on an integral imaging monitor.

3-D Image Reconstruction Techniques for Plant and Animal Morphological Analysis - A Review

  • Rahman, Anisur;Mo, Changyeun;Cho, Byoung-Kwan
    • Journal of Biosystems Engineering
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    • v.42 no.4
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    • pp.339-349
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    • 2017
  • Purpose: This review focuses on the major 3-D image reconstruction techniques and their applications in plant and animal morphological analysis. Methods & Results: This paper begins with an overview of major 3-D image reconstruction techniques and their basic principles. Subsequently, their applications in plant and animal morphological analysis are reviewed. A discussion on the limitations and future research direction of 3-D imaging techniques for accurate, fast measurements and modeling of plant and animal morphological analysis follows. Conclusions: Owing to the increasing demand for plant and animal morphological analysis, the application of 3-D imaging techniques will increase in popularity among researchers and the agricultural industry.

Viewing-angle enhanced Integral 3D Imaging along full directions without mechanical movement (기계적 움직임 없이 수직.수평 방향으로 향상된 시야각을 갖는 Integral 3D Imaging)

  • 정성용;박재형;최희진;민성욱;이병호
    • Proceedings of the Optical Society of Korea Conference
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    • 2003.02a
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    • pp.240-241
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    • 2003
  • 여러 3차원 디스플레이 기술 중 integral imaging은 안경 및 기타 보조기구를 착용하지 않은 관측자에게 시야각 내에서 연속적인 시점, 수직수평 패럴랙스, 실시간 full color 동영상의 재생을 지원한다는 장점을 갖고 있어 최근 많은 관심을 받으며 이에 대한 연구가 활발히 진행되고 있다. Integral imaging에 대한 연구는 주로 시야각을 향상시키거나 재생되는 입체 영상의 해상도를 향상시키는 방향으로 이루어지고 있다. (중략)

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Optimization of Backside Etching with High Uniformity for Large Area Transmission-Type Modulator

  • Lee, Soo-Kyung;Na, Byung-Hoon;Ju, Gun-Wu;Choi, Hee-Ju;Lee, Yong-Tak
    • Proceedings of the Korean Vacuum Society Conference
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    • 2012.08a
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    • pp.319-320
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    • 2012
  • Large aperture optical modulator called optical shutter is a key component to realize time-of-flight (TOF) based three dimensional (3D) imaging systems [1-2]. The transmission type electro-absorption modulator (EAM) is a prime candidate for 3D imaging systems due to its advantages such as small size, high modulation performance [3], and ease of forming two dimensional (2D) array over large area [4]. In order to use the EAM for 3D imaging systems, it is crucial to remove GaAs substrate over large area so as to obtain high uniformity modulation performance at 850 nm. In this study, we propose and experimentally demonstrate techniques for backside etching of GaAs substrate over a large area having high uniformity. Various methods such as lapping and polishing, dry etching for anisotropic etching, and wet etching ([20%] C6H8O7 : H2O2 = 5:1) for high selectivity backside etching [5] are employed. A high transmittance of 80% over the large aperture area ($5{\times}5mm^2$) can be obtained with good uniformity through optimized backside etching method. These results reveal that the proposed methods for backside etching can etch the substrate over a large area with high uniformity, and the EAM fabricated by using backside etching method is an excellent candidate as optical shutter for 3D imaging systems.

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