摘要
根据振动模糊图像和静止图像在频谱上存在的对应关系,即振动模糊图像频谱存在着对应于零阶贝塞尔函数零点的暗纹(贝塞尔条纹);提出对一幅振动模糊图像,经过二维傅里叶变换、灰度均衡以及Radon变换等步骤检测振动模糊图像频谱图上贝塞尔条纹的方向和位置,来实现振动方向和振幅测量的方法;试验证明可以实现平面内任意方向振动的测量,振幅测量精度亚像素级。
According to the corresponding relationship between vibration blurred image and static image in frequency domain, that is a set of negative ripples appears in spectrums of blurred image corresponding to zero values of the zero order Bessel function, a direction and amplitude measurement method is introduced. Some steps should be carried out to detect the directions and locations of Bessel ripples in spectrums of blurred image; they are: 2D-Fourier transform, histogram equalization, Radon transform and so on. The method is proved robust and can be used to measure vibration in arbitrary directions, in addition, the measurement results of amplitude can reach sub-pixel precision.
出处
《振动与冲击》
EI
CSCD
北大核心
2005年第5期59-62,89,共5页
Journal of Vibration and Shock
基金
国家自然科学基金资助项目(50375099)
关键词
振动模糊
二维傅里叶变换
频谱
贝塞尔条纹
灰度均衡
RADON变换
Bessel functions
Fourier transforms
Measurements
Radon
Robustness (control systems)
Vibrations (mechanical)
