• Title/Summary/Keyword: optical distortion

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The Design of Wide Angle Mobile Camera Corrected Optical Distortion for Peripheral Area (주변부 상의 왜곡을 보정한 모바일 광각 카메라의 광학적 설계)

  • Kim, Se-Jin;Jeong, Hye-Jung;Lim, Hyeon-Seon
    • Journal of Korean Ophthalmic Optics Society
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    • v.18 no.4
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    • pp.503-507
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    • 2013
  • Purpose: This study was to design wide angle mobile camera corrected optical distortion for peripheral area, which were reduced optical distortion and TV distortion by using 4 aspherical lenses. Methods: The optical design was satisfied with ${\pm}1%$ optical distortion in viewing angle of $95^{\circ}$ and total length of optical system was less than 4.5 mm which was considering a thickness of mobile camera. 1/3.2 inch (5M) CCD sensor was used in the optical system and set design condition to satisfy MTF which was over than 20% in 140 lp/mm. Results: Optimized wide angle mobile camera showed ${\pm}1%$ optical distortion in full field of $95^{\circ}$ viewing angle and TV distortion was 0.46% so that distortion of peripheral area was reduce. MTF showed over than 20% in every field. Ray aberration and astigmatism were small amount so that it showed stable performance. Conclusions: Obtain wider and clearer view which is reduced image distortion of surrounding area via optical method in wide angle mobile camera which has wider view angle than current mobile camera. And it was able to fix a demerit when it occurred via software correction. It is able to apply to study of camera which is related to spectacles.

The characteristics of optical CDMA systems using PN codes and FBGs for ultra-fast optical access networks (초고속 광 가입자망 구축을 위한 PN 부호와 FBG를 이용한 광 CDMA의 특성분석)

  • 김봉규;연영희;김병휘;박상조
    • Korean Journal of Optics and Photonics
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    • v.13 no.6
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    • pp.501-505
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    • 2002
  • We have numerically analysed the effects of the light sourer spectral power distortion in an optical CDMA system using PN codes and FBGI for ultra-fast multi-access optical networks. The interference between two CDMA channels decreases with an increase in the code length and the .simultaneous access number is equal to the code length in the region of 0 to 15% spectral power distortion. As a result, the spectral power distortion with optical spectrum is very important in designing the optical CDMA systems.

Fabrication of the focal length and distortion measurement system (초점길이 및 왜곡수차 측정장치 제작)

  • 조현모
    • Proceedings of the Optical Society of Korea Conference
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    • 1990.02a
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    • pp.82-86
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    • 1990
  • A camera type optical bench system equipped with a lens collimator and an image analyzer is fabricated to measure the equivalent focal length and distortion of lenses. This system is automatized by the computer which controls stepping motors. A nodal slide optical bench system equipped with an off axis reflective collimator is fabricated and improved by using rotating arms and air bearing system. distortion measurement on a wide angle lens using the camera method and the nodal slide method is reported. Defocusing error in the distortion measurement with the nodal slide optical bench is analyzed and improved by iteration method to search the correct image point.

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Design of a Low Distortion Head-Mounted Display with Freeform Reflective Mirror Based on Two Ellipsoids Structure

  • Wang, Junhua;Liang, Yuechao;Xu, Min
    • Journal of the Optical Society of Korea
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    • v.20 no.2
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    • pp.234-238
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    • 2016
  • A new method to design a low distortion, even relative illumination, optical see-through head-mounted display (HMD) with a freeform reflective mirror (FFRM) based on the two similar ellipsoids structure is proposed. The HMD we have realized has a simple structure which consists of two similar ellipsoid surfaces, an FFRM, a 7-piece co-axis relay lens, and an OLED. This structure can be applied to offset distortion, reach even relative illumination, and correct the off-axis aberrations. The HMD we finally have realized has a near 3% low distortion, a higher than 80% relative illumination, and a 40°×30° field of view (FOV).

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.

Analysis of Correction Displacements of the Projected Distortion Image (투사된 영상에 대한 화면 변위 보정에 관한 연구)

  • Chi, Yongseok
    • Journal of the Semiconductor & Display Technology
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    • v.20 no.3
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    • pp.18-21
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    • 2021
  • This paper analyzes the distortion correction of the in the micro DMD(digital micro mirror device) projector system using 0.25 or less optical throwing distance ratio. The distortion of projected image occurs depending on the performance of the optical lens, the installation location of the projection system, and the tilt of the screen. This study analyzed the physical tilt values influencing of the distortion of projected image, removed the tilt distortion of throwing distance ratio optical lens, and adjusted the distortion image by the simulation of calibration displacements. The results of this study demonstrated within 5% TV distortion reference. Moreover, the correction method reduced the pin-distortion correction of projection system.

Functional Relation Between Signal Distortion and a Figure of Merit for Nonlinear Process in Dispersion-managed Optical Transmission

  • Kim, Sungman
    • Journal of the Optical Society of Korea
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    • v.16 no.2
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    • pp.95-100
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    • 2012
  • We show that the minimum EOP (eye-opening penalty) obtained by tunable dispersion compensation is a function of a figure of merit for a nonlinear process, $I_0L_{eff}$, where $I_0$ is the optical intensity and $L_{eff}$ is the effective length of the interaction region. Using this rule, we do not need to conduct nonlinear simulations in all the cases of signal power and transmission length to obtain the signal distortion in dispersion-managed optical transmission. Instead, we need to conduct a simulation in only one case of a signal power and find the functional relation, and then we can obtain the values of the signal distortion in other cases using the discovered functional relation. This technique can reduce the number of nonlinear simulations to less than 10%.

Direct Measurement of Distortion of Optical System of Lithography (노광 광학계의 왜곡수차 측정에 관한 연구)

  • Joo, WonDon;Lee, JiHoon;Chae, SungMin;Kim, HyeJung;Jung, Mee Suk
    • Korean Journal of Optics and Photonics
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    • v.23 no.3
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    • pp.97-102
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    • 2012
  • In general, one of the methods used to measure distortion is to use the full image of the regular pattern. However, because of low accuracy, this method is mainly used for an optical system such as a camera.. In order to measure distortion with high accuracy less than 1um, one can use the method of measuring the exact position of a mask image. In this case, a high accuracy stage with a laser encoder is required. In this paper, we investigate measurement of the distortion of high accuracy with a simple manual stage. The main idea is that we split and measure the mask image with the overlapping area by using CCD or CMOS, and then we get an exact position of the mask image by integrating the adjacent split images. We use the Canny Edge Detection method to get the position information of the mask image and we researched the process to exactly calculate distortion by using coordinate transformations and a least square method.

Waveform distortion of the stimulated Brillouin scattering in a single mode optical fiber with Q-switched Nd:YAG laser

  • Lee, Sang-Hun;Cho, Jin-Hang;Kim, Chil-Min
    • Proceedings of the Optical Society of Korea Conference
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    • 2008.02a
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    • pp.335-336
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    • 2008
  • We observe the distortion of the back scattered Stokes pulse and the complementary distortion of the transmitted pulse by the stimulated Brillouin scattering when a Q-switched Nd:YAG laser pulse injected into a single mode optical fiber. We determine the constant required energy for the SBS by comparing their temporal shapes.

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A Study on Image Distortion Correction for Gobo Lighting Optical System (고보 조명 광학계의 이미지 왜곡 보정에 관한 연구)

  • Gyu-Ha Kim;Ji-Hwan Lee;Chang-Hun Lee;Mee-Suk Jung
    • Korean Journal of Optics and Photonics
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    • v.34 no.2
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    • pp.61-65
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    • 2023
  • This paper studies a method of applying pre-distortion to the image mask of the gobo illumination optical system to correct an irradiated image and irradiate a clear image. In the case of the gobo illumination optical system, since it is generally irradiated with a tilt, distortion in the upper and lower directions occurs severely in the image. To solve this problem, the correction coordinates of the image were derived using a proportional equation, and the distortion was corrected by applying them to the image mask. As a result, it was confirmed that the distortion was reduced by 64.5% compared to the case of using the existing image mask.