• 제목/요약/키워드: lenslet model

검색결과 7건 처리시간 0.024초

Improved Viewing Quality of 3-D Images in Computational Integral Imaging Reconstruction Based on Lenslet Array Model

  • Shin, Dong-Hak;Lee, Byoung-Ho;Kim, Eun-Soo
    • ETRI Journal
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    • 제28권4호
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    • pp.521-524
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    • 2006
  • In this letter, we propose a novel computational integral imaging reconstruction technique based on a lenslet array model. The proposed technique provides improvement of viewing images by extracting multiple pixels from elemental images according to ray tracing based on the lenslet array model. To show the feasibility of the proposed technique, we analyze it according to ray optics and present the experimental results.

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렌즈배열 모델을 적용한 3차원 집적영상 기술에서의 컴퓨터적 시점 재생 방법 (Computational view-point reconstruction method in three-dimensional integral imaging using lenslet array model)

  • 신동학;권영만;김은수
    • 한국정보통신학회논문지
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    • 제10권10호
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    • pp.1848-1853
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    • 2006
  • 본 논문에서는 3차원 집적 영상 기술에서 렌즈배열 모델을 적용하여 컴퓨터적으로 해상도가 개선된 3차원 영상을 재생하는 방법을 제안하고, 그 성능을 분석한다. 기존의 보고된 컴퓨터 적 시점 재생 방법은 핀홀 배열 모델에 기초하지만, 제안하는 방법은 렌즈 배열 모델을 적용하기 때문에 동일한 요소영상에서 다수의 픽셀을 추출하여 높은 해상도를 얻을 수 있다. 제안한 방법의 유용함을 보이기 위해 기초적인 실험을 수행하고 그 결과를 보고한다.

렌즈릿 모델에 기초한 컴퓨터 변환을 통한 Orthoscopic 집적 영상 디스플레이 (Orthoscopic Integral Imaging Display by Use of Computational Method Based on Lenslet Model)

  • 신동학;홍석민;이병국
    • 한국정보통신학회:학술대회논문집
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    • 한국정보통신학회 2012년도 추계학술대회
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    • pp.1015-1018
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    • 2012
  • 본 논문에서는 집적 영상 기술에서 오쏘스코픽 3D 영상을 복원할 수 있는 렌즈 모델에 기초한 컴퓨터 깊이 반전 방법을 제안한다. 제안하는 방법은 임의의 거리에 대해서 깊이 반전된 요소 영상을 생성할 수 있으며, 깊이 반전에 필요한 추가적인 과정이 없다. 렌즈 모델에 기초한 깊이 반전 방법의 유용함을 보이기 위한 기초적인 실험을 수행하고 그 결과를 보고한다.

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Spatial Frequency Coverage and Image Reconstruction for Photonic Integrated Interferometric Imaging System

  • Zhang, Wang;Ma, Hongliu;Huang, Kang
    • Current Optics and Photonics
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    • 제5권6호
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    • pp.606-616
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    • 2021
  • A photonic integrated interferometric imaging system possesses the characteristics of small-scale, low weight, low power consumption, and better image quality. It has potential application for replacing conventional large space telescopes. In this paper, the principle of photonic integrated interferometric imaging is investigated. A novel lenslet array arrangement and lenslet pairing approach are proposed, which are helpful in improving spatial frequency coverage. For the novel lenslet array arrangement, two short interference arms were evenly distributed between two adjacent long interference arms. Each lenslet in the array would be paired twice through the novel lenslet pairing approach. Moreover, the image reconstruction model for optical interferometric imaging based on compressed sensing was established. Image simulation results show that the peak signal to noise ratio (PSNR) of the reconstructed image based on compressive sensing is about 10 dB higher than that of the direct restored image. Meanwhile, the normalized mean square error (NMSE) of the direct restored image is approximately 0.38 higher than that of the reconstructed image. Structural similarity index measure (SSIM) of the reconstructed image based on compressed sensing is about 0.33 higher than that of the direct restored image. The increased spatial frequency coverage and image reconstruction approach jointly contribute to better image quality of the photonic integrated interferometric imaging system.

3D Integral Imaging Display using Axially Recorded Multiple Images

  • Cho, Myungjin;Shin, Donghak
    • Journal of the Optical Society of Korea
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    • 제17권5호
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    • pp.410-414
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    • 2013
  • In this paper, we propose a 3D display method combining a pickup process using axially recorded multiple images and an integral imaging display process. First, we extract the color and depth information of 3D objects for displaying 3D images from axially recorded multiple 2D images. Next, using the extracted depth map and color images, elemental images are computationally synthesized based on a ray mapping model between 3D space and an elemental image plane. Finally, we display 3D images optically by an integral imaging system with a lenslet array. To show the usefulness of the proposed system, we carry out optical experiments for 3D objects and present the experimental results.

Fast Noise Reduction Approach in Multifocal Multiphoton Microscopy Based on Monte-Carlo Simulation

  • Kim, Dongmok;Shin, Younghoon;Kwon, Hyuk-Sang
    • Current Optics and Photonics
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    • 제5권4호
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    • pp.421-430
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    • 2021
  • The multifocal multiphoton microscopy (MMM) enables high-speed imaging by the concurrent scanning and detection of multiple foci generated by lenslet array or diffractive optical element. The MMM system mainly suffers from crosstalk generated by scattered emission photons that form ghost images among adjacent channels. The ghost image which is a duplicate of the image acquired in sub-images significantly degrades overall image quality. To eliminate the ghost image, the photon reassignment method was established using maximum likelihood estimation. However, this post-processing method generally takes a longer time than image acquisition. In this regard, we propose a novel strategy for rapid noise reduction in the MMM system based upon Monte-Carlo (MC) simulation. Ballistic signal, scattering signal, and scattering noise of each channel are quantified in terms of photon distribution launched in tissue model based on MC simulation. From the analysis of photon distribution, we successfully eliminated the ghost images in the MMM sub-images. If the priori MC simulation under a certain optical condition is established at once, our simple, but robust post-processing technique will continuously provide the noise-reduced images, while significantly reducing the computational cost.

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

  • 신동학;김남우;이준재
    • 한국정보통신학회논문지
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    • 제11권2호
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    • pp.337-343
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    • 2007
  • 집적 영상 기술에서 재생되는 3차원 영상은 요소 영상의 해상도에 비례하기 때문에 고해상도의 3차원 영상을 얻기 위해서 요소 영상의 정보량이 급격히 증가하는 문제가 있다. 본 논문에서는 이 문제점을 해결하기 위해서 핀홀 모델 기반의 새로운 1차원 집적 영상 기법을 제안한다. 제안하는 기법에서 새로운 형태의 1차원 요소 영상을 제공하며, 이 요소 영상은 기존의 2차원 요소 영상에서 핀홀 모델을 적용하여 각각의 요소 영상에 대해서 수평 픽셀 라인을 선택하고 확대하여 만들고 지며, 이를 3차원 영상의 재생에 사용하였다. 제안하는 기법은 수직시차를 제거함으로써 요소영상의 정보량을 상당히 감소시킬 수 있다. 제안하는 방법 유용함을 보이기 위해서 광학적 실험을 수행하고, 그 결과를 보고한다.