Non-contact small vibration visual measurement method

A micro-vibration and visual measurement technology, applied in the field of computer vision, can solve problems such as measurement and analysis of micro-vibration signals, and achieve the effect of fast measurement speed and high measurement accuracy

Active Publication Date: 2019-11-12
HEFEI UNIV OF TECH
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Problems solved by technology

However, these methods generally require humans to determine the frequency parameters of the band-pass filter based on prior knowledge, and have not effectively measured and analyzed tiny vibration signals.

Method used

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  • Non-contact small vibration visual measurement method

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Embodiment Construction

[0030] combine figure 1 , the non-contact micro-vibration visual measurement technology of the present invention comprises the following steps:

[0031] Step S1: collect video data of vibrating objects in nature to extract tiny vibration signals;

[0032] In this step, according to an embodiment of the present invention, specifically:

[0033] 1a) A Canon camera EOS 600D is used to capture a video of a vibrating object in a natural environment. The frame rate of the camera is 50 frames per second, the image resolution is 1280×720, the video acquisition time is 7 seconds, and it is saved in avi video format. Using color space conversion, it is converted from RGB space to YIQ space, and the video sequence of Y (brightness) channel is extracted for subsequent analysis.

[0034] 1b) Extract the first frame image in the video sequence, and manually select the vibration target region (ROI); use the canny operator to detect its edge, and then generate an edge mask Image Mask with ...

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Abstract

The invention discloses a non-contact small vibration visual measurement method. The method aims to study the frequency characteristics of small vibration signals, and the technology mainly comprisessmall vibration signal extraction, camera motion interference suppression processing, signal analysis and the like. The method comprises the following steps of step S1, collecting video data of a vibrating object in the natural world to extract small vibration signals; step S2, converting the small vibration signals into a frequency domain by using a Fourier transform to obtain a spectrum thereof;step S3, extracting a camera motion signal from the video data, and analyzing the camera motion signal to obtain an attenuation coefficient vector Coe; and step S4, multiplying the attenuation coefficient vector Coe by spectrums of the respectively micro vibration signals, and obtaining a vibration target spectrum after averaging.

Description

technical field [0001] The invention belongs to the technical field of computer vision, and relates to a non-contact micro-vibration visual measurement method in a real scene. Background technique [0002] The vibration characteristics of a vibrating object are closely related to its own state. For example, the vibration information generated during the operation of an industrial system reflects its structural characteristics and operating status. Bad vibration not only affects the performance of the system, but even has serious safety consequences. [0003] The existing vibration measurement methods are divided into two types: contact and non-contact. Contact vibration measurement sensors, such as piezoelectric sensors, acceleration sensors, etc., are generally installed on the surface of the object to be measured, and the vibration measurement is realized by converting the vibration signal into an electrical signal. During the measurement process, the mechanical loss of...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
CPCG01H9/00
Inventor 杨学志张龙黄飞龙张礼俊辛宜曈张肖
Owner HEFEI UNIV OF TECH
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