摘要
为了对物体产生的微弱振动频率进行测量,该文提出了基于视频放大的非平稳微振动测量方法。该方法首先使用摄像机拍摄物体振动视频并将微振动可视化,进而从视频中提取物体振动频率信息。具体地,首先采用基于灰度空间的欧拉视频放大(Euler video amplification based on gray space, EVM-GS)方法将视频中肉眼难以分辨的微弱振动放大到人眼能够明显观察的幅度;然后通过基于灰度值帧差的最佳分析区域选择算法确定分析区域,对该区域使用空间滤波对视频图像去噪以及减小待处理数据量;最后使用基于S变换的非平稳信号分析方法(non-stationary signal analysis method based on S transform,NSS-S)提取振动频率。实验结果表明,该测量方法能将微振动可视化,并实现非接触式的无损测量,所测振动频率结果准确。
In order to measure the weak vibration frequency of objects, a non-stationary micro-vibration measurement method based on video amplification is proposed. Through this method, the video of vibration is captured by camera and the micro vibration is visualized firstly, and then the vibration frequency information of the object is extracted from the video. Specifically, firstly, the Euler video amplification based on gray space method is used to amplify the weak vibrations in the video which is difficult to distinguish by naked eyes to the amplitude that can be observed clearly by human eyes;then the analysis region is determined by the best analysis region selection algorithm based on the gray value frame difference, and the spatial filtering is used to denoise the video image and reduce the amount of data to be processed;finally, the non-stationary signal analysis method based on S transform is used to extract the vibration frequency. The experimental results show that the measurement method can visualize the micro-vibration and realize non-contact non-destructive measurement, and the measured vibration frequency results are accurate.
作者
单明广
熊雪芬
刘彬
钟志
SHAN Mingguang;XIONG Xuefen;LIU Bin;ZHONG Zhi(College of Information and Communication Engineering,Harbin Engineering University,Harbin 150001,China;Key Laboratory of Advanced Ship Communication and Information Technology Ministry of Industry and Information Technology,Harbin Engineering University,Harbin 150001,China)
出处
《实验技术与管理》
CAS
北大核心
2021年第9期64-69,共6页
Experimental Technology and Management
基金
国家自然科学基金项目(61775046)
中央高校基本科研业务费(3072021CF0803,3072021CFJ0801)
哈尔滨工程大学“课程思政”示范课(YJSKCSZ202007)。
关键词
微振动测量
视频放大
空间滤波
S变换
micro-vibration measurement
video amplification
spatial filtering
S transform
