• CN:11-2187/TH
  • ISSN:0577-6686

›› 2004, Vol. 40 ›› Issue (4): 85-88.

• 论文 • 上一篇    下一篇

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高频振动振幅的视觉测量

汪国宝;王石刚;于新瑞;徐威   

  1. 上海交通大学机械与动力工程学院
  • 发布日期:2004-04-15

VISION MEASUREMENT FOR AMPLITUDE OF HIGH FREQUENCY VIBRATION

Wang Guobao;Wang Shigang;Yu Xinrui;Xu Wei   

  1. College of Mechanical and Energy Engineering, Shanghai Jiaotong University
  • Published:2004-04-15

摘要: 研究了运动模糊图像在空间域和频域上的数学模型,理论分析指出物体作高频谐波振动时运动模糊成像的频谱上会由于Bessel函数的零点的存在而形成系列暗条纹。提出利用CCD摄取一幅振动模糊图像,经二维傅里叶变换,并采用图像处理技术检测频谱上直线条纹的位置,即可实现高频振动振幅的图像测量,测量结果为亚像素级的精度。

关键词: 贝塞尔函数, 频谱, 条纹, 运动模糊图像, 振幅测量

Abstract: Mathematical modelal are researched in space domain and frequency domain for motion-blurred image. Series of dark stripes can be found on spectrums of motion-blurred images of a vibrating object with high frequency, which is due to zero value of Bessel function. Adding 2-D Fourier transform on a vibration-blurred image recorded by CCD, linear stripes are inspected and located in spectrum images and realize the image measurement of vibration amplitudes. Measurement results can reach sub-pixel precision.

Key words: Amplitude measuring, Bessel function, Motion-blurred image, Spectrum, Stripe

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