Journal of Korea Multimedia Society (한국멀티미디어학회논문지)

Korea Multimedia Society (한국멀티미디어학회)
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Design of Ball and Plate Robot controller using Single Camera

단일 Camera를 이용한 Ball and Plate 로봇 제어장치 설계

  • 박이근 (전남대학교 전자컴퓨터공학과) ;
  • 박주연 (전남대학교 전자컴퓨터공학과) ;
  • 박성모 (전남대학교 전자컴퓨터공학부(전남대학교 정보통신연구소))
  • Received : 2012.07.19
  • Accepted : 2013.01.29
  • Published : 2013.02.28
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Abstract

This paper proposes a design method of ball-plate robot controller using single camera and two motors to balance the ball on plate and reduce steady state control error. To design the ball-plate system, it is necessary to observe state of the ball and maintain balance of the plate. The state of the ball is tracked by using the CAMShift algorithm and position error of the ball is compensated by the Kalman filter. Balance of the plate is controlled by driving two motors and we used DC motors which has smaller measurement error. Due to surface condition of the plate or tracking error of ball's position, there are small errors remained. These errors are accumulated and disturb maintaining balance of the ball. To handle the problem, we propose a controller supplemented with an integrator.

본 논문에서는 단일 카메라와 2개의 모터를 이용하는 볼-플레이트 로봇제어장치를 설계하는 방법과 제어 오차를 줄이는 방법을 제안한다. 볼-플레이트 시스템을 설계하기 위해서는 볼의 상태 파악과 플레이트의 균형 유지가 필요하다. 볼의 상태는 캠시프트 알고리즘을 이용하여 추적하고 칼만필터로 공의 위치 오차를 보정한다. 플레이트 균형은 두 개의 모터를 움직여 제어하는데 측정 오차가 적은 DC모터를 사용하였다. 플레이트의 표면적 상태나 공의 위치 추적오류 등을 인하여 작은 오차가 여전히 남아있다. 이러한 오차는 점점 쌓이게 되며 결국은 볼의 균형유지를 방해하게 된다. 이를 해결하기 위해 적분기를 추가한 제어기를 제안한다.

Keywords

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