• 제목/요약/키워드: camera

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고속 카메라 기술 동향 (Technical Trend of High Speed Camera)

  • 박두진;노영환;김태형;이효근
    • 항공우주산업기술동향
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    • 제6권2호
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    • pp.125-132
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    • 2008
  • 빨리 이동하는 피사체의 움직임을 상세히 분석하기 위해서는 고속 카메라가 필수 불가결하다. 본 논문에서는 고속 필름 카메라와 고속 디지털 카메라의 기본개념, 역사적 배경 및 향후 고속 카메라의 동향을 기술 하고자 한다. 또한 해외 및 국내 고속 카메라의 사용현황과 나로 우주센터에서 사용될 고속 카메라의 운용계획을 기술 하고자 한다.

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Offline Camera Movement Tracking from Video Sequences

  • Dewi, Primastuti;Choi, Yeon-Seok;Cha, Eui-Young
    • 한국정보통신학회:학술대회논문집
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    • 한국해양정보통신학회 2011년도 춘계학술대회
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    • pp.69-72
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    • 2011
  • In this paper, we propose a method to track the movement of camera from the video sequences. This method is useful for video analysis and can be applied as pre-processing step in some application such as video stabilizer and marker-less augmented reality. First, we extract the features in each frame using corner point detection. The features in current frame are then compared with the features in the adjacent frames to calculate the optical flow which represents the relative movement of the camera. The optical flow is then analyzed to obtain camera movement parameter. The final step is camera movement estimation and correction to increase the accuracy. The method performance is verified by generating a 3D map of camera movement and embedding 3D object to the video. The demonstrated examples in this paper show that this method has a high accuracy and rarely produce any jitter.

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이동로봇의 위치 추정을 위한 스케일 불변 특징점 추출 및 거리 측정에 관한 연구 (A Study on Scale-Invariant Features Extraction and Distance Measurement for Localization of Mobile Robot)

  • 정대섭;장문석;유제군;이응혁;심재홍
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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    • pp.625-627
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    • 2005
  • Existent distance measurement that use camera is method that use both Stereo Camera and Monocular Camera, There is shortcoming that method that use Stereo Camera is sensitive in effect of a lot of expenses and environment variables, and method that use Monocular Camera are big computational complexity and error. In this study, reduce expense and error using Monocular Camera and I suggest algorithm that measure distance, Extract features using scale Invariant features Transform(SIFT) for distance measurement, and this measures distance through features matching and geometrical analysis, Proposed method proves measuring distance with wall by geometrical analysis free wall through feature point abstraction and matching.

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새로운 선형의 외형적 카메라 보정 기법 (A New Linear Explicit Camera Calibration Method)

  • 도용태
    • 센서학회지
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    • 제23권1호
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    • pp.66-71
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    • 2014
  • Vision is the most important sensing capability for both men and sensory smart machines, such as intelligent robots. Sensed real 3D world and its 2D camera image can be related mathematically by a process called camera calibration. In this paper, we present a novel linear solution of camera calibration. Unlike most existing linear calibration methods, the proposed technique of this paper can identify camera parameters explicitly. Through the step-by-step procedure of the proposed method, the real physical elements of the perspective projection transformation matrix between 3D points and the corresponding 2D image points can be identified. This explicit solution will be useful for many practical 3D sensing applications including robotics. We verified the proposed method by using various cameras of different conditions.

배경시차 보정을 이용한 스테레오 시각장치의 주시각제어 (Disparity compensation for vergence control of active stereo camera)

  • 박순용;이용범;진성일
    • 전자공학회논문지S
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    • 제34S권9호
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    • pp.67-76
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    • 1997
  • This ppaer describes the development of the stereo camera system(KASS-1) and the control of the vergence of the stereo camera to fix a gaze on a moving object in real-time using a stereo disparity. The motion energy and the stereo disparity of a moving object from the stereo image are used to control the vergence of stereo camera to keep stereo disparity constant. The disparity from the rotating stereo camera is introduced not only from the moving object but also from the background. In this paper, the background disparity error due to the vergence control of the stereo camera is eliminated by compensation algoithm, and the vergence of steereo camera system can be controlled continuously using the disparity of a moving object only.

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시변 순차영상을 이용한 On-line 카메라 교정 (On-line Camera Calbration Using the Time-Varying Image Sequence)

  • 김범진;이호순;최성구;노도환
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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    • pp.440-440
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    • 2000
  • In general, camera calibration is consisted of Indoor and Outdoor system. In case of Indoor system, it was optimized experimental condition. However, Outdoor system is different camera parameters for each image that is compared to equaled position. That is, it imply that camera parameters are varied by an environment with light or impulse noise, etc. So we make use of Image sequence because that they provide the more information for each image. In addition to, we use Corresponding line because it has less error than Corresponding point. Corresponding line has also the more information. In this paper, we suggest on-line camera calibration method using the time-varying Image sequence and Corresponding line. So we calculate camera parameters with intrinsic and extrinsic parameters in On-line system.

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카메라를 이용한 진동 측정 시 주요인자 분석 (Parameter Studies for Measuring Vibration by Using Camera)

  • 전형섭;최영철;박진호;박종원
    • 한국소음진동공학회논문집
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    • 제20권11호
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    • pp.1033-1037
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    • 2010
  • Accelerometer and laser vibrometers are widely used to measure vibration of structures like a building or piping. Recently, the research measuring vibration by using camera image is introduced. This method can measure multi-points simultaneously. Also, it is possible to measure in the long distance. When we measure the vibration using a camera, the parameter analysis is needed. Therefore, this paper took the experiment for the camera lens selection. An error by the camera images characteristic was theoretically analyzed and we verified through an experiment. And the accuracy of the method measuring the vibration displacement by using the camera images was analyzed.

신경회로망을 이용한 카메라 교정과 2차원 거리 측정에 관한 연구 (Neural Network Based Camera Calibration and 2-D Range Finding)

  • 정우태;고국원;조형석
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1994년도 추계학술대회 논문집
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    • pp.510-514
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    • 1994
  • This paper deals with an application of neural network to camera calibration with wide angle lens and 2-D range finding. Wide angle lens has an advantage of having wide view angles for mobile environment recognition ans robot eye in hand system. But, it has severe radial distortion. Multilayer neural network is used for the calibration of the camera considering lens distortion, and is trained it by error back-propagation method. MLP can map between camera image plane and plane the made by structured light. In experiments, Calibration of camers was executed with calibration chart which was printed by using laser printer with 300 d.p.i. resolution. High distortion lens, COSMICAR 4.2mm, was used to see whether the neural network could effectively calibrate camera distortion. 2-D range of several objects well be measured with laser range finding system composed of camera, frame grabber and laser structured light. The performance of 3-D range finding system was evaluated through experiments and analysis of the results.

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중부하용 가변속 카메라 회전대 개발에 대한 연구 (A study on the development of variable speed camera for heavy duty)

  • 김주한;성하경
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2006년도 춘계학술대회 논문집
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    • pp.299-300
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    • 2006
  • The camera and reduction mechanism that are equipment outdoors camera for general CCTV are miniaturization trend gradually. The foreign countries began to sell variableness speed type camera drivels that do DC voltage by motive power recently. But, Domestic is state that enterprise which has technology connected with this does not exist. We need optimum control program design, an internal organs technology, actuator interface and a driver design technology that have position control special quality of high accuracy as a necessary technology for CCTV camera drivers. Also, we need detailed mechanism design and a manufacture technology of camera drivers that behave variable speed essentially.

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배전 선로의 열화 진단을 위한 복합 카메라 보정기법 (A Composite Camera Calibration Technique for Thermal Deterioration Diagnosis of Power Distribution Line)

  • 정하형;박진하;유준
    • 제어로봇시스템학회논문지
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    • 제22권6호
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    • pp.463-469
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    • 2016
  • This paper presents a composite camera calibration method to determine thermal degradation of power distribution equipment by combining an infrared (IR) camera and a color camera. A calibration jig was first constructed to match the properties of the two cameras. Our calibration and visualization techniques allow for the display of two images, one from the color camera and the other from the IR camera with different field of views (FOVs), on the screen at the same time. To confirm its validity, several case studies have been developed to analyze thermal deterioration limits of indoor and outdoor power distribution facilities.