• Title/Summary/Keyword: mirror imaging

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Compact Catadioptric Wide Imaging with Secondary Planar Mirror

  • Ko, Young-Jun;Yi, Soo-Yeong
    • Current Optics and Photonics
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    • v.3 no.4
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    • pp.329-335
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    • 2019
  • Wide FOV imaging systems are important for acquiring rich visual information. A conventional catadioptric imaging system deploys a camera in front of a curved mirror to acquire a wide FOV image. This is a cumbersome setup and causes unnecessary occlusions in the acquired image. In order to reduce both the burden of the camera deployment and the occlusions in the images, this study uses a secondary planar mirror in the catadioptric imaging system. A compact design of the catadioptric imaging system and a condition for the position of the secondary planar mirror to satisfy the central imaging are presented. The image acquisition model of the catadioptric imaging system with a secondary planar mirror is discussed based on the principles of geometric optics in this study. As a backward mapping, the acquired image is restored to a distortion-free image in the experiments.

Optical Design of an Image-space Telecentric Two-mirror System for Wide-field Line Imaging

  • Lee, Jong-Ung;Kim, Youngsoo;Kim, Seo Hyun;Kim, Yeonsoo;Kim, Hyunsook
    • Current Optics and Photonics
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    • v.1 no.4
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    • pp.344-350
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    • 2017
  • We present a new design approach and an example design for an image-space telecentric two-mirror system that has a fast f-number and a wide-field line image. The initial design of the telecentric mirror system is a conventional axially symmetric system, consisting of a flat primary mirror with fourth-order aspheric deformation and an oblate ellipsoidal secondary mirror to correct spherical aberration, coma, and field curvature. Even though in the optimized design the primary mirror is tilted, to avoid ray obstruction by the secondary mirror, the image-space telecentric two-mirror system shows quite good imaging performance, for a line imager.

Realization of a High Speed Optic Scanner for Infrared Thermal Imaging (적외선 체열촬영시스템을 위한 고속 광주사기의 구현)

  • 이수열
    • Journal of Biomedical Engineering Research
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    • v.16 no.1
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    • pp.43-48
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    • 1995
  • A high speed optic scanner capable of 16 frames/sec imaging has been developed for the realization of the infrared thermal Imaging system with a single element infrared sensor. The high speed optic scanner is composed of a rotating polygon mirror for horizontal scanning, a flat mirror mounted on a galvanometer for vertical scanning, and a spherical mirror. It has been experimentally found that the optic scanner is capable of 16 framesllsec imaging with the frame matrix size of 256 x 64.

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Wide Field-of-View Imaging Using a Combined Hyperbolic Mirror

  • Yi, Sooyeong;Ko, Youngjun
    • Current Optics and Photonics
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    • v.1 no.4
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    • pp.336-343
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    • 2017
  • A wide field-of-view (FOV) image contains more visual information than a conventional image. This study proposes a new type of hyperbolic mirror for wide FOV image acquisition. The proposed mirror consists of a hyperbolic cylindrical section and a bowl-shaped hyperbolic omnidirectional section. Using an imaging system with this mirror, it is possible to achieve a $213.8^{\circ}$ horizontal and a $126.94^{\circ}$ vertical maximum FOV. Parameters of each section of the mirror are designed to be continuous at the junction of the two parts, and the resultant image is seamless. The image-acquisition model is obtained using ray-tracing optics. To rectify the geometrical distortion of the original image due to the mirror, an image-restoration algorithm based on conformal projection is presented in this study. The performance of the proposed imaging system with the hyperbolic mirror and its image-restoration algorithm are verified by experiments.

Improvement of Migration Image for Ocean-bottom Seismic Data using Wavefield Separation and Mirror Imaging (파동장 분리와 미러 이미징을 이용한 해저면 탄성파 탐사 자료의 참반사 보정 영상 개선)

  • Lee, Ganghoon;Pyun, Sukjoon
    • Geophysics and Geophysical Exploration
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    • v.21 no.2
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    • pp.112-124
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    • 2018
  • Ocean-bottom seismic survey is a seismic acquisition technique which measures data by installing 4-component receiver on the sea floor. It can produce more improved data in quality than any other acquisition techniques. In the ocean-bottom seismic survey, however, the number of receivers is limited due to high cost. Since only a small number of receivers are used for acquisition, ocean-bottom seismic data may suffer from discontinuities of events over traces, which can result in spatial aliasing. In this paper, we implemented Kirchhoff migration using mirror-imaging algorithm to improve the quality of ocean-bottom seismic image. In order to implement the mirror imaging algorithm, the seismograms should be separated into up-going and down-going wavefields and the down-going wavefield should be used for migration. In this paper, we use the P-Z summation method to separate the wavefield. Numerical examples show that the migration results using mirror imaging algorithm have wider illumination than the conventional migration, especially in the shallow layers.

Mirror Structure Analysis of High Resolution Optical Imaging Payload (고해상도 광학영상장비 반사경 구조해석)

  • Kwon, Woo-Gun;Kim, Kwang-Ro;Lee, Young-Shin
    • Proceedings of the KSME Conference
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    • pp.462-467
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    • 2003
  • For the Space-borne optical imaging payload system design, light weighting and moderate stiffness of mirror and/or mirror fixation device is very important aspects. The front surface of mirror is regulated by optical performance requirement, but the shape of backplate of mirror is to be optimised while satisfing the required stiffness and weight. According to the results, the best shape of backplate cell is triangular. And also related geometric dimensions and the optimised mounting point of MFD(Mirror Fixation Device) is presented. Finally, natural frequencies and shpaes of mirror structure are analysed.

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Reconstruction of Wide FOV Image from Hyperbolic Cylinder Mirror Camera (실린더형 쌍곡면 반사체 카메라 광각영상 복원)

  • Kim, Soon-Cheol;Yi, Soo-Yeong
    • The Journal of Korea Robotics Society
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    • v.10 no.3
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    • pp.146-153
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    • 2015
  • In order to contain as much information as possible in a single image, a wide FOV(Field-Of-View) imaging system is required. The catadioptric imaging system with hyperbolic cylinder mirror can acquire over 180 degree horizontal FOV realtime panorama image by using a conventional camera. Because the hyperbolic cylinder mirror has a curved surface in horizontal axis, the original image acquired from the imaging system has the geometrical distortion, which requires the image processing algorithm for reconstruction. In this paper, the image reconstruction algorithms for two cases are studied: (1) to obtain an image with uniform angular resolution and (2) to obtain horizontally rectilinear image. The image acquisition model of the hyperbolic cylinder mirror imaging system is analyzed by the geometrical optics and the image reconstruction algorithms are proposed based on the image acquisition model. To show the validity of the proposed algorithms, experiments are carried out and presented in this paper. The experimental results show that the reconstructed images have a uniform angular resolution and a rectilinear form in horizontal axis, which are natural to human.

Integral-floating Display with 360 Degree Horizontal Viewing Angle

  • Erdenebat, Munkh-Uchral;Baasantseren, Ganbat;Kim, Nam;Kwon, Ki-Chul;Byeon, Jina;Yoo, Kwan-Hee;Park, Jae-Hyeung
    • Journal of the Optical Society of Korea
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    • v.16 no.4
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    • pp.365-371
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    • 2012
  • A three-dimensional integral-floating display with 360 degree horizontal viewing angle is proposed. A lens array integrates two-dimensional elemental images projected by a digital micro-mirror device, reconstructing three-dimensional images. The three-dimensional images are then relayed to a mirror via double floating lenses. The mirror rotates in synchronization with the digital micro-mirror device to direct the relayed three-dimensional images to corresponding horizontal directions. By combining integral imaging and the rotating mirror scheme, the proposed method displays full-parallax three-dimensional images with 360 degree horizontal viewing angle.

Optical design of three-mirror telescope system for infra-red and visible imaging (적외선 및 가시광선 결상용 3반사망원경계의 설계)

  • 이종웅;홍경희;권우근
    • Korean Journal of Optics and Photonics
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    • v.7 no.3
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    • pp.183-190
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    • 1996
  • To design three-mirror telescope system (F/8, 120 inch in focal length) for visible and infra-red band imaging, methods for power configuring and correction of the third order aberrations were studied. In the design of the telescope system, a three-mirror system corrected for spherical aberration, coma, and astigmatism was used for infra-red imaging, and the aberrations were corrected by using conic surfaces. For visible imaging, a singlet corrector lens was appended at the front of the focal plane to correct filed curvature. The telescope system has diffraction limited performance for 10 ${\mu}{\textrm}{m}$ in wavelength within 2.4$^{\circ}$ of field-of-view. In the visible band imaging, the rms spot size of the telescope system is less than 25 ${\mu}{\textrm}{m}$ within 3$^{\circ}$ of field-of-view for monochromatic light, and the telescope system satisfies flat field condition for CCD application.

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Wide FOV Panorama Image Acquisition Method (광각 파노라마 영상획득 방법)

  • Kim, Soon-Cheol;Yi, Soo-Yeong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.3
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    • pp.2117-2122
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    • 2015
  • Wide FOV(Field-of-View) is required to contain much more visual information in a single image. The wide FOV imaging system has many industrial applications such as surveillance, security, tele-conference, and mobile robots. In order to obtain a wide FOV panorama image, an imaging system with hyperbolic cylinder mirror is proposed in this paper. Because the horizontal FOV is more important than the vertical FOV in general, a hyperbolic cylinder mirror is designed in this paper, that has a hyperbolic curve in the horizontal surface and is the same as a planar mirror in the vertical axis. Imaging model of the proposed imaging system is presented by ray tracing method and the hyperbolic cylinder mirror is implemented. The imaging performance of wide FOV is verified by experiments in this paper. This imaging system is cost-effective and is possible to acquire a wide panorama image having 210 degree horizontal FOV in real-time without an extra image processing.