• 제목/요약/키워드: Camera System

검색결과 5,122건 처리시간 0.038초

CCD 카메라를 사용한 저가형 Digital X-Ray 영상취득 시스템 (Low Cost Digital X-Ray Image Capture System Using CCD Camera)

  • 강용철
    • 전기학회논문지P
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    • 제56권1호
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    • pp.19-22
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    • 2007
  • We developed a low cost digital X-Ray image capturing system using a CCD camera, instead of using the high cost image plate and image intensifier. In order to reduce the system volume, we directly made the dark box shorter than the previous model. Using the graphic language, we developed a program in order for post-processing the images captured by the CCD camera. This program improves the image resolving power.

A Flexible Camera Calibration System for Mobile Platform

  • Lu, Bo;Whangbo, Taeg-Keun;Han, Tae-Kyu
    • 한국정보처리학회:학술대회논문집
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    • 한국정보처리학회 2013년도 추계학술발표대회
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    • pp.1457-1460
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    • 2013
  • We propose a flexible camera calibration system for mobile platform to calibrate the camera's intrinsic parameters which based on the geometrical property of the vanishing points determined by two perpendicular groups of parallel lines. The system only requires the camera to observe a rectangle card show at a few(at least four)different orientation. The experimental results of the real images show the proposed calibration system in this paper is easy to use and robust.

영상처리를 이용한 머리의 움직임 추적 시스템 (Head tracking system using image processing)

  • 박경수;임창주;반영환;장필식
    • 대한인간공학회지
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    • 제16권3호
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    • pp.1-10
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    • 1997
  • This paper is concerned with the development and evaluation of the camera calibration method for a real-time head tracking system. Tracking of head movements is important in the design of an eye-controlled human/computer interface and the area of virtual environment. We proposed a video-based head tracking system. A camera was mounted on the subject's head and it took the front view containing eight 3-dimensional reference points(passive retr0-reflecting markers) fixed at the known position(computer monitor). The reference points were captured by image processing board. These points were used to calculate the position (3-dimensional) and orientation of the camera. A suitable camera calibration method for providing accurate extrinsic camera parameters was proposed. The method has three steps. In the first step, the image center was calibrated using the method of varying focal length. In the second step, the focal length and the scale factor were calibrated from the Direct Linear Transformation (DLT) matrix obtained from the known position and orientation of the camera. In the third step, the position and orientation of the camera was calculated from the DLT matrix, using the calibrated intrinsic camera parameters. Experimental results showed that the average error of camera positions (3- dimensional) is about $0.53^{\circ}C$, the angular errors of camera orientations are less than $0.55^{\circ}C$and the data aquisition rate is about 10Hz. The results of this study can be applied to the tracking of head movements related to the eye-controlled human/computer interface and the virtual environment.

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철도차량 IP 카메라 시스템 적용에 대한 고찰 (Consideration for application of IP camera system in Rolling Stock)

  • 최만기;정필화;정호영;박종천
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2010년도 춘계학술대회 논문집
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    • pp.187-195
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    • 2010
  • IP 카메라란 영상을 네트워크를 통하여 전송하는 카메라로 웹 서버, 네트워크 인터페이스 장치 및 CCD(Charge Coupled Device) 모듈을 모두 내장하고 있어 영상을 네트워크를 통하여 실시간으로 전송이 가능하며 네트워크가 구축된 곳 어디서든 카메라의 IP 또는 웹 주소를 통해서 24시간 현장의 영상을 모니터링하고 기록한다. 현재 IP 카메라는 기술의 발전과 함께 날로 진화하여 기존의 아날로그 카메라시장을 점차 대체해가고 있으며, 아직은 초기 단계지만 우수한 확장성과 아날로그 카메라의 노이즈 문제를 극복하기 위해 철도차량에서도 점차 그 영역을 넓혀갈 것으로 기대된다. 하지만 IP 카메라의 상용화를 위해서는 여러 해결되지 않은 문제점들이 내제되어 있어 본 논문에서는 철도차량의 IP 카메라 시스템 구성에 대해 알아보고 철도차량용 IP 카메라 시스템의 개발 및 설계에 도움이 되고자 한다.

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동적 스테레오 카메라 모델링 (An active stereo camera modeling)

  • 도경민;이쾌희
    • 제어로봇시스템학회논문지
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    • 제3권3호
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    • pp.297-304
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    • 1997
  • In stereo vision, camera modeling is very important because the accuracy of the three dimensional locations depends considerably on it. In the existing stereo camera models, two camera planes are located in the same plane or on the optical axis. These camera models cannot be used in the active vision system where it is necessary to obtain two stereo images simultaneously. In this paper, we propose four kinds of stereo camera models for active stereo vision system where focal lengths of the two cameras are different and each camera is able to rotate independently. A single closed form solution is obtained for all models. The influence of the stereo camera model to the field of view, occlusion, and search area used for matching is shown in this paper. And errors due to inaccurate focal length are analyzed and simulation results are shown. It is expected that the three dimensional locations of objects are determined in real time by applying proposed stereo camera models to the active stereo vision system, such as a mobile robot.

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컬러 정보를 이용한 무인항공기에서 실시간 이동 객체의 카메라 추적 (The Camera Tracking of Real-Time Moving Object on UAV Using the Color Information)

  • 홍승범
    • 한국항공운항학회지
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    • 제18권2호
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    • pp.16-22
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    • 2010
  • This paper proposes the real-time moving object tracking system UAV using color information. Case of object tracking, it have studied to recognizing the moving object or moving multiple objects on the fixed camera. And it has recognized the object in the complex background environment. But, this paper implements the moving object tracking system using the pan/tilt function of the camera after the object's region extraction. To do this tracking system, firstly, it detects the moving object of RGB/HSI color model and obtains the object coordination in acquired image using the compact boundary box. Secondly, the camera origin coordination aligns to object's top&left coordination in compact boundary box. And it tracks the moving object using the pan/tilt function of camera. It is implemented by the Labview 8.6 and NI Vision Builder AI of National Instrument co. It shows the good performance of camera trace in laboratory environment.

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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A method for image processing by use of inertial data of camera

  • Kaba, K.;Kashiwagi, H.
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1998년도 제13차 학술회의논문집
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    • pp.221-225
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    • 1998
  • This paper is to present a method for recognizing an image of a tracking object by processing the image from a camera, whose attitude is controlled in inertial space with inertial co-ordinate system. In order to recognize an object, a pseudo-random M-array is attached on the object and it is observed by the camera which is controlled on inertial coordinate basis by inertial stabilization unit. When the attitude of the camera is changed, the observed image of M-array is transformed by use of affine transformation to the image in inertial coordinate system. Taking the cross-correlation function between the affine-transformed image and the original image, we can recognize the object. As parameters of the attitude of the camera, we used the azimuth angle of camera, which is de-fected by gyroscope of an inertial sensor, and elevation an91e of camera which is calculated from the gravitational acceleration detected by servo accelerometer.

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Design and Implementation of Control Program for EO/IR Camera mounted on Multi-Purpose Unmanned Helicopter

  • Ahn, MyeongGi;Seong, KilYoung;Lee, JongHun;Kim, JaeKyung
    • 항공우주시스템공학회지
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    • 제15권6호
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    • pp.72-77
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    • 2021
  • This paper proposes a design and development plan for a control program for the MX-10 EO/IR camera. This camera is a piece of mission equipment mounted on the multi-purpose unmanned helicopter (MPUH) system. Operators must be able to control the necessary functions of the camera to perform their assigned tasks. To achieve this, the function to control the camera was analyzed, and a control program was developed. In addition, the control program was linked to a joystick for convenient operation of the camera by the operator.

한 대의 USB port 카메라와 자바를 이용한 3차원 정보 추출 (3-D Position Analysis of an Object using a Monocular USB port Camera through JAVA)

  • 지창호;이동엽;이만형
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2001년도 춘계학술대회 논문집
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    • pp.606-609
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    • 2001
  • This paper's purpose is to obtain 3-Dimension information by using a monocular camera. This system embodies to obtain the height of object by using trigonometry method between a reference point of circumstance and an object. It is possible to build up system regardless of operating system, and then set it up. An comfortable USB port camera is used everywhere without the capture board. The internet can be used by using the applet and JMF everywhere. We regard the camera as a fixed. And we have developed a Real-Time JPEG/RTP Network Camera system using UDP/IP on Ethernet.

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