• Title/Summary/Keyword: camera vibration

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Development of Leak and Vibration Monitoring System for High Pressure Steam Pipe by Using a Camera (카메라를 이용한 고압 증기 배관 누설/진동 감시시스템 개발)

  • Jeon, Hyeong-Seop;Suh, Jang-Su;Chae, Gyung-Sun;Son, Ki-Sung;Kim, Se-Oh;Lee, Nam-Hee
    • Journal of the Korean Society for Nondestructive Testing
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    • v.36 no.6
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    • pp.496-503
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    • 2016
  • Leakages at plant structures of power and petrochemistry plants have led to casualties and economic losses. These leakages are caused by fatigue failure of pipelines and their wall thickness. Vibration measurement methods for plant pipelines mainly use acceleration and laser sensors. These sensors are difficult to install and operate and thus lead to an increase in operational cost especially for wide area surveillance. Recently, measurements of leak and vibration displacements using cameras have attracted the interest of many researchers. This method has advantages such as simple installation, long distance monitoring, and wide area surveillance. Therefore, in this paper, we have developed a system that can measure the leakage and vibrational displacement by using a camera. Furthermore, the developed system was verified with experimental data.

Effective De-blurring Algorithm for the Vibration Blur of the Interlaced Scan Type Digital Camera (인터레이스 스캔 방식 디지털 카메라 떨림 블러에 대한 효과적 제거 알고리즘)

  • Chon, Jae-Choon;Kim, Hyong-Suk
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.54 no.9
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    • pp.559-566
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    • 2005
  • An effective do-blurring algorithm is proposed to remove the blur of the even and the odd line images of the interlaced scan type camera. n the object or the camera moves fast while the interlaced scan type digital camera is acquiring images, blur is often created due to the misalignment between two images of even and odd lines. In this paper, the blurred original image is separated into the even and the odd line images of the half size. Two full sized images are generated using interpolation technique based on these two in ages. Again, these images are signed and combined through the processes of feature extraction, matching, sub-pixel matching, outlier removal, and mosaicking. De-blurring simulations about the images of different camera motions have been done.

Dynamic Modulation Transfer Function Analysis of Images Blurred by Sinusoidal Vibration

  • Du, Yanlu;Ding, Yalin;Xu, Yongsen;Sun, Chongshang
    • Journal of the Optical Society of Korea
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    • v.20 no.6
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    • pp.762-769
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    • 2016
  • The dynamic modulation transfer function (MTF) for image degradation caused by sinusoidal vibration is formulated based on a Bessel function of the first kind. The presented method makes it possible to obtain an analytical MTF expression derived for arbitrary frequency sinusoidal vibration. The error obtained by the use of finite order sum approximations instead of infinite sums is investigated in detail. Dynamic MTF exhibits a stronger random behavior for low frequency vibration than high frequency vibration. The calculated MTFs agree well with the measured MTFs with the slant edge method in imaging experiments. With the proposed formula, allowable amplitudes of any frequency vibration are easily calculated. This is practical for the analysis and design of the line-of-sight stabilization system in the remote sensing camera.

Real Time Pothole Detection System based on Video Data for Automatic Maintenance of Road Surface Distress (도로의 파손 상태를 자동관리하기 위한 동영상 기반 실시간 포트홀 탐지 시스템)

  • Jo, Youngtae;Ryu, Seungki
    • KIISE Transactions on Computing Practices
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    • v.22 no.1
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    • pp.8-19
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    • 2016
  • Potholes are caused by the presence of water in the underlying soil structure, which weakens the road pavement by expansion and contraction of water at freezing and thawing temperatures. Recently, automatic pothole detection systems have been studied, such as vibration-based methods and laser scanning methods. However, the vibration-based methods have low detection accuracy and limited detection area. Moreover, the costs for laser scanning-based methods are significantly high. Thus, in this paper, we propose a new pothole detection system using a commercial black-box camera. Normally, the computing power of a commercial black-box camera is limited. Thus, the pothole detection algorithm should be designed to work with the embedded computing environment of a black-box camera. The designed pothole detection algorithm has been tested by implementing in a black-box camera. The experimental results are analyzed with specific evaluation metrics, such as sensitivity and precision. Our studies confirm that the proposed pothole detection system can be utilized to gather pothole information in real-time.

On the Compensation of Camera Hand Shaking Using Friction Driven Piezoelectric Actuator (마찰 구동형 압전 작동기를 이용한 카메라 손떨림 진동보상 기법 연구)

  • Cho, Myungsin;Hwang, Jaihyuk
    • Journal of Aerospace System Engineering
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    • v.9 no.4
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    • pp.23-30
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    • 2015
  • The focal plane image stabilization for a camera is one of the most effective method that can increases the digital camera's image quality by compensating the vibration disturbance. The optical image stabilization can be implemented by making the focal plane to trace the path of incident light. To control the position of focal plane motion compensating stage precisely, a nonlinear control algorithm has been applied by considering coulomb friction which is nonlinear behavior of the compensator system. In our study, we have analyzed the hand shaking vibration using the gyro sensor, and made a mathematical model of compensating stage containing optical sensor and piezo-actuator. Then the nonlinear control algorithm has been designed and its performance has been verified by experiment. In this study, a friction driven peizo-electric actuator with $1{\mu}m$ resolution and 10mm/s speed has been used for stage movement.

Evaluation of Performance of a DPRMs by the Vibration Signal Analysis. (진동신호 분석을 통한 DPRMs의 성능평가)

  • Choi, Young-Sam;Shin, Chan-Ho;Chung, Jin-Tai;Han, Song-Soo;Lee, Sang-Heon;Lee, Kye-Young
    • Proceedings of the KSME Conference
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    • 2004.11a
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    • pp.788-792
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    • 2004
  • In this study, the performance of the DPRMs is evaluated and the measurement precision for the pile driving is presented. The DPRMs is a visual-measurement system for the pile rebound and the penetration movement using a high speed line-scan camera. But the measurement errors of the DPRMs are caused by the strong impact for the pile driving. Therefore, the DPRMs should guarantee its measurement values for the pile driving. For this reason, the performance of the DPRMs by the vibration signal analysis is studied. It is found from this study that the measurement values of the DPRMs are reliable.

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