• Title/Summary/Keyword: one camera

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HVCM (Hybrid Voice Coil Motor) Actuator apply performance improvement through the AUTO Focusing Camera Module (HVCM(Hybrid Voice Coil Motor) Actuator적용을 통한 AUTO Focusing Camera Module 성능개선)

  • Kwon, Tae-Kwon;Kim, Young-Kil
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2011.05a
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    • pp.307-309
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    • 2011
  • The recently-released camera modules assembled into high-end handsets generally carry auto focusing function. The resolution size of the camera modules is getting higher, and customers demand more precise and stable auto focusing function. When auto focusing function is getting performed, the camera modules applied to VCM usually have the problems, which are an error of lens focusing position and resolution deviation according to the shift of one's position. For this reason, I propose Hybrid VCM that has an improved structure for a stable work of actuator and higher resolution level.

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On Design of Visual Servoing using an Uncalibrated Camera in 3D Space

  • Morita, Masahiko;Kenji, Kohiyama;Shigeru, Uchikado;Lili, Sun
    • 제어로봇시스템학회:학술대회논문집
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    • 2003.10a
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    • pp.1121-1125
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    • 2003
  • In this paper we deal with visual servoing that can control a robot arm with a camera using information of images only, without estimating 3D position and rotation of the robot arm. Here it is assumed that the robot arm is calibrated and the camera is uncalibrated. We use a pinhole camera model as the camera one. The essential notion can be show, that is, epipolar geometry, epipole, epipolar equation, and epipolar constrain. These play an important role in designing visual servoing. For easy understanding of the proposed method we first show a design in case of the calibrated camera. The design is constructed by 4 steps and the directional motion of the robot arm is fixed only to a constant direction. This means that an estimated epipole denotes the direction, to which the robot arm translates in 3D space, on the image plane.

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Camera Calibration and Pose Estimation for Tasks of a Mobile Manipulator (모바일 머니퓰레이터의 작업을 위한 카메라 보정 및 포즈 추정)

  • Choi, Ji-Hoon;Kim, Hae-Chang;Song, Jae-Bok
    • The Journal of Korea Robotics Society
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    • v.15 no.4
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    • pp.350-356
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    • 2020
  • Workers have been replaced by mobile manipulators for factory automation in recent years. One of the typical tasks for automation is that a mobile manipulator moves to a target location and picks and places an object on the worktable. However, due to the pose estimation error of the mobile platform, the robot cannot reach the exact target position, which prevents the manipulator from being able to accurately pick and place the object on the worktable. In this study, we developed an automatic alignment system using a low-cost camera mounted on the end-effector of a collaborative robot. Camera calibration and pose estimation methods were also proposed for the automatic alignment system. This algorithm uses a markerboard composed of markers to calibrate the camera and then precisely estimate the camera pose. Experimental results demonstrate that the mobile manipulator can perform successful pick and place tasks on various conditions.

Detecting steam leakage by using correction of camera vibrating (카메라 흔들림 보정을 통한 증기 누설 탐지)

  • Choi, Young-Chul;Yoon, Chan-Hoon;Kim, Jin-Seop
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2014.10a
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    • pp.394-398
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    • 2014
  • Steam leakage is one of the major issues for the structural fracture of pipes of nuclear power plants. Therefore a method to inspect a large area of piping systems quickly and accurately is needed. Recently, the research detecting the steam leakage by using camera image is introduced. However, this method has a disadvantage. If a camera oscillates, it cannot detect a steam leakage exactly. In this paper, the technique that reduces the error due to a camera shaking is proposed. To verify the proposed method, we have performed the experiments for the oil leakage experiments. The results show that the technique can calibrate the error due to camera shaking.

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Correction of Error due to Camera Vibrating During Detecting Steam Leakage by Using Image (영상을 이용한 누설탐지에서 카메라 진동 오차 보정)

  • Choi, Young-Chul;Jeon, Hyeong-Seop;Son, Ki-Sung;Park, Jong Won
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.24 no.10
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    • pp.795-801
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    • 2014
  • Steam leakage is one of the major issues for the structural fracture of pipes of nuclear power plants. Therefore a method to inspect a large area of piping systems quickly and accurately is needed. Recently, the research detecting the steam leakage by using camera image is introduced. However, this method has a disadvantage. If a camera oscillates, it cannot detect a steam leakage exactly. In this paper, the technique that reduces the error due to a camera shaking is proposed. To verify the proposed method, we have performed the experiments for the oil leakage experiments. The results show that the technique can calibrate the error due to camera shaking.

Digital Video Camera Characterization Considering White Balance (White Balance를 고려한 디지털 비디오 카메라 Characterization)

  • 박종선;김대원;장수욱;김은수;송규익
    • Proceedings of the IEEK Conference
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    • 2002.06d
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    • pp.299-302
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    • 2002
  • Digital video camera can be a useful tool to capture images for use in colorimeter. However, the RGB signals generated by different digital video camera are not equal for the same scene. The digital video camera for use in colorimeter is characterized based on the CIE standard colorimetric observer. One method of deriving a colorimetric characterization matrix between camera RGB output signals and CIE XYZ tristimulus values is Polynomial modeling. In this paper, 3${\times}$3 linear matrix and 3${\times}$l1 polynomial matrix is used to investigate the characterization performance of the professional digital video camera. In experimental results, it is demonstrated that proposed 3${\times}$3 linear matrix has a reasonable degree of accuracy for use in colorimeter.

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A Study on the Estimation of Camera Calibration Parameters using Cooresponding Points Method (점 대응 기법을 이용한 카메라의 교정 파라미터 추정에 관한 연구)

  • Choi, Seong-Gu;Go, Hyun-Min;Rho, Do-Hwan
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.50 no.4
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    • pp.161-167
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    • 2001
  • Camera calibration is very important problem in 3D measurement using vision system. In this paper is proposed the simple method for camera calibration. It is designed that uses the principle of vanishing points and the concept of corresponding points extracted from the parallel line pairs. Conventional methods are necessary for 4 reference points in one frame. But we proposed has need for only 2 reference points to estimate vanishing points. It has to calculate camera parameters, focal length, camera attitude and position. Our experiment shows the validity and the usability from the result that absolute error of attitude and position is in $10^{-2}$.

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Capturing Distance Parameters Using a Laser Sensor in a Stereoscopic 3D Camera Rig System

  • Chung, Wan-Young;Ilham, Julian;Kim, Jong-Jin
    • Journal of Sensor Science and Technology
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    • v.22 no.6
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    • pp.387-392
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    • 2013
  • Camera rigs for shooting 3D video are classified as manual, motorized, or fully automatic. Even in an automatic camera rig, the process of Stereoscopic 3D (S3D) video capture is very complex and time-consuming. One of the key time-consuming operations is capturing the distance parameters, which are near distance, far distance, and convergence distance. Traditionally these distances are measured by tape measure or triangular indirect measurement methods. These two methods consume a long time for every scene in shot. In our study, a compact laser distance sensing system with long range distance sensitivity is developed. The system is small enough to be installed on top of a camera and the measuring accuracy is within 2% even at a range of 50 m. The shooting time of an automatic camera rig equipped with the laser distance sensing system can be reduced significantly to less than a minute.

On Design of Visual Servoing using an Uncalibrated Camera and a Calibrated Robot

  • Uchikado, Shigeru;Morita, Masahiko;Osa, Yasuhiro;Mabuchi, Tesuo;Tanya, Kanya
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.23.2-23
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    • 2001
  • In this paper we deal with visual servoing that can control a robot arm with a camera using information of images only, without estimating 3D position and rotation of the robot arm. Here it is assumed that the robot arm is calibrated and the camera is uncalibrated. We use a pinhole camera model as the camera one. The essential notion can be show, that is, epipolar geometry, epipole, epipolar equation, and epipolar constrain. These play an important role in designing visual servoing. For easy understanding of the proposed method we first show a design in case of the calibrated camera. The design is constructed by 4 steps and the directional motion of the robot arm is fixed only to a constant direction. This means that an estimated epipole denotes the direction, to which the robot arm translates in 3D space, on the image plane.

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A Study on Design of Visual Sensor Using Scanning Beam for Shape Recognition of Weld Joint. (용접접합부의 형상계측을 위한 주사형 시각센서의 설계에 관한 연구)

  • 배강열
    • Journal of Welding and Joining
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    • v.21 no.2
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    • pp.102-110
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    • 2003
  • A visual sensor consisted of polygonal mirror, laser, and CCD camera was proposed to measure the distance to the weld joint for recognizing the joint shape. To scan the laser beam of the sensor onto an object, 8-facet polygonal mirror was used as the rotating mirror. By locating the laser and the camera at axi-symmetrical positions around the mirror, the synchronized-scan condition could be satisfied even when the mirror was set to rotate through one direction continuously, which could remove the inertia effect of the conventional oscillating-mirror methods. The mathematical modelling of the proposed sensor with the optical triangulation method made it possible to derive the relation between the position of an image on the camera and the one of a laser light on the object. Through the geometrical simulation of the proposed sensor with the principal of reflection and virtual image, the optical path of a laser light could be predicted. The position and direction of the CCD camera were determined based on the Scheimpflug's condition to fit the focus of any image reflected from an object within the field of view. The results of modelling and simulation revealed that the proposed visual sensor could be used to recognize the weld joint and its vicinity located within the range of the field of view and the resolution. (Received February 19, 2003)