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박수우(Su-Woo Park),송병섭(Byung-Seop Song),도용태(Yongtae Do) 제어로봇시스템학회 2009 제어·로봇·시스템학회 논문지 Vol.15 No.2
When the visually impaired walks inside a building like corridor, a GPS cannot be useful for the walker in estimating his or her position unlike the case of outdoor space. This paper presents two novel methods to measure the walking distance using a low cost camera worn on the chest of the visually impaired. In the first method we analyze the periodic variation of image focusing values. Walking steps are counted by checking the period tor the rough measure of the walking distance. The second method counts the step number by monitoring fixtures on the ceiling, which have a certain interval. Lamps on the ceiling appeared on the video are monitored in this paper. The T-S fuzzy theory is used to detect lamps, and the walking steps are estimated by the positional variation of the lamp due to the gait of the walker. The two methods are tested in real experiment, and the results are compared.
김윤수,박수우,임병훈,김태균,최병재,박철영,이문락,도용태 대구대학교 정보통신연구소 2008 情報通信硏究 Vol.5 No.1
Metal balls are commonly used in mechanical elements and systems including bearings. If there is a defect in a metal ball, it can cause a serious machine failure. By this reason every balls produced are required to be inspected, and the inspection is usually done by human eyes. However, the inspection by human eyes is always with the risk of mistakes, and a need to automate the inspection process is arisen. This paper describes a design of an automatic inspection system for detecting defects on ball surface. A machine vision system is used, and design process and techniques are described in detail. 강구는 베어링을 비롯한 기계 요소 및 장치에서 널리 사용되는 부품이다. 만약 강구에 결함이 있을 시, 이를 사용하는 기계에서 치명적인 결함이 초래될 수 있다. 따라서 제조된 강구에 대해서는 전량검사가 요구되고 있고, 검사과정은 사람의 육안에 의한 검사가 주를 이루고 있다. 그런데 사람에 의한 검사에는 항상 실수의 가능성이 있으므로, 이를 자동화하는 것이 필요하다. 본 논문에서는 강구의 표면 결함을 자동적으로 검사할 수 있는 장치를 설계한다. 기계시각 장치가 사용되었고, 설계에 따른 구체적 절차와 기술들이 서술된다.
실내 보행자에 부착된 카메라 영상에 의한 보행거리 측정
김정대,박수우,도용태 제어로봇시스템학회 2009 제어로봇시스템학회 국내학술대회 논문집 Vol.2009 No.9
In this paper, we propose a new technique to approximate the walking distance of an indoor pedestrian using a low-cost camera. At first, attention points on images are automatically detected, and then the variation of the attention points due to the gait is monitored in image sequences. The walking distance can be approximated by counting the step number which is estimated from the variation of the attention points. The technique proposed is checked in real experiments under various conditions. We expect this technique can be employed for guiding the visually impaired.
박찬호(C. H, Park),허다경(D. K. Heo),김승언(S. E. Kim),최중해(J. H. Choi),박수우(S. W. Park),송병섭(B. S. Song) 한국재활복지공학회 2016 한국재활복지공학회 학술대회논문집 Vol.2016 No.11
Nowadays, the supply of powered wheelchair has been increasing and the safety accidents by wheelchair have been occurred frequently. Most of the accidents caused by the user’s poor driving and the result of the accidents lead serious problem to the user. Preventing the accident, an App. and active safety controller system for powered wheelchair was developed using ultrasound sensors and position sensitive device(PSD). The system will detect the location of obstacles and transfer the information of it to the user. After the system was designed and fabricated, the experiments of obstacles detection were carried out. The results showed that the designed system have excellent performances and the system could reduce the occurrence of accidents.