• Title/Summary/Keyword: Compact camera module

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Zoom lens design for compact digital camera using lens modules (렌즈모듈을 이용한 컴팩트 디지털 카메라용 줌 렌즈 설계)

  • Park, Sung-Chan;Lee, Sang-Hun
    • Korean Journal of Optics and Photonics
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    • v.16 no.1
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    • pp.34-42
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    • 2005
  • This paper presents the optimum initial design containing the first and third order properties of the three-group zoom system using lens modules, and the real lens design of the system. The optimum initial design with focal length range of 4.3 mm to 8.6 mm is derived by assigning appropriate first and third order quantities to each module along with the specific constraints required for the system. An initial real lens selected for each group has been designed to match its focal length and the first orders into those of the each lens modules, and then combined to establish an actual zoom system by adjusting the air space between the groups at all zoom positions. The combination of the separately designed groups results in a system which satisfies the first order properties of the zoom system composed of the original lens modules. As a result, by residual aberration correction, we could obtain a zoom system useful in compact digital zoom cameras and mobile phone cameras employing the rear focus method.

Development of Vision Sensor Module for the Measurement of Welding Profile (용접 형상 측정용 시각 센서 모듈 개발)

  • Kim C.H.;Choi T.Y.;Lee J.J.;Suh J.;Park K.T.;Kang H.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.285-286
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    • 2006
  • The essential tasks to operate the welding robot are the acquisition of the position and/or shape of the parent metal. For the seam tracking or the robot automation, many kinds of contact and non-contact sensors are used. Recently, the vision sensor is most popular. In this paper, the development of the system which measures the profile of the welding part is described. The total system will be assembled into a compact module which can be attached to the head of welding robot system. This system uses the line-type structured laser diode and the vision sensor It implemented Direct Linear Transformation (DLT) for the camera calibration as well as radial distortion correction. The three dimensional shape of the parent metal is obtained after simple linear transformation and therefore, the system operates in real time. Some experiments are carried out to evaluate the performance of the developed system.

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A Study of AF Focusing algorithm for camera module (소형 카메라 모듈의 오토 포커싱 알고리즘에 관한 연구)

  • An, Jong-Su;Kim, Young-Gil
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2011.05a
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    • pp.320-323
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    • 2011
  • The compact camera assembled into Smart phone is required to have higher resolution level in non AF state than existing handsets, and it is also requested to have higher degree of accuracy, more consistent repetitiveness, and faster auto focusing speed. Algorithm based on a mechanical position of the existing actuator has been discussed. Therefore, in this thesis I suggest an improved algorithm concerning the problem of unstable resolution level in non AF state and auto focusing speed.

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Differential Interference Contrast Microscopic Module Using a Polarization Grating for Quantitative Phase Imaging (편광 격자 기반 정량적 위상 이미징을 위한 미분 간섭 현미경 모듈 개발)

  • Jin Hee Cho;Ki-Nam Joo
    • Korean Journal of Optics and Photonics
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    • v.34 no.6
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    • pp.261-268
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    • 2023
  • We propose a compact differential interference contrast microscopic module, which enables snapshot measurements for quantitative phase imaging. The proposed module adopts the lateral shearing interferometric principle, which can obtain self-interference without a reference. Due to the absence of the reference, the system is more stable than the typical interferometric systems. It uses a polarization grating to generate two laterally shifted wavefronts based on its birefringence and polarizing beam-splitting characteristics. Furthermore, the use of a polarization camera does not require sequential measurements for the phase extraction. In the experiments, we observe and measure the timely varying changes of various specimens to verify the system performance with the bright field images and phase contrast images. Because the proposed microscopic module also has the merit of being adaptable to typical microscopy instead of using an imaging camera, it can conveniently replace conventional contrast microscopy.

A Fuzzy Search Method for Auto Focusing of CCM Test Handlers (CCM 테스트핸들러의 자동초점조절을 위한 피지탐색 방법)

  • Kwon, Hyuk-Joong;Yoon, Hee-Sang;Park, Tae-Hyoung
    • Proceedings of the KIEE Conference
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    • 2006.10c
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    • pp.123-126
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    • 2006
  • We propose a new-focusing method for test handlers of compact camera module (CCM), The MMD (max-min difference) method is applied to calculate the focus value quickly considering the noisy output of CCM. Also, the fuzzy search method is applied to find the maximum focus value effectively. We design a fuzzy processor to control the lens position by focus values and brightness values, which improves the focusing performance in the sense of speed and processor memory. The proposed method is implemented by program and installed at the CCM test handler machines. The simulation results are presented to verify the usefulness of the proposed method.

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Design of an 8x Four-group Inner-focus Zoom System Using a Focus Tunable Lens

  • Lee, Daye;Park, Sung-Chan
    • Journal of the Optical Society of Korea
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    • v.20 no.2
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    • pp.283-290
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    • 2016
  • This study presents an 8x four-group inner-focus zoom lens with one-moving group for a compact camera by use of a focus tunable lens (FTL). In the initial design stage, we obtained the powers of lens groups by paraxial design based on thin lens theory, and then set up the zoom system composed of four lens modules. Instead of numerically analytic analysis for the zoom locus, we suggest simple analysis for that using lens modules optimized. After replacing four groups with equivalent thick lens modules, the power of the fourth group, which includes a focus tunable lens, is designed to be changed to fix the image plane at all positions. From this design process, we can realize an 8x four-group zoom system having one moving group by employing a focus tunable lens. The final designed zoom lens has focal lengths of 4 mm to 32 mm and apertures of F/3.5 to F/4.5 at wide and tele positions, respectively.

Development of Diagnostic Device for the Tooth Crack Using Transmitted Light (투과 광을 이용한 치아 균열 진단기 개발)

  • Yang, Jeong Su;Seo, Hyo-Gi;Lee, Joon-Seok;Choi, Keum Yeon;Cho, Jin-Hyoung
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.29 no.5
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    • pp.317-320
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    • 2016
  • In order to acquire clear images capable of diagnosing cracked tooth by light transmission, the optical properties of LED light source were examined. Based on the results, the prototype which basically consisted of LED light source, bandpass filter and commercial compact camera module was designed and manufactured. The wavelength and optical power of the LED in the prototype were 850 nm and 7 mW/Sr, respectively. In evaluation of the prototype using microscope, the observation of the crack with width of above $17{\mu}m$ was possible. In addition, image analysis to obtain shape information on the observed tooth cracks was carried out.