A method for measuring building vibration displacement based on visual processing

Abstract

The invention relates to a method for measuring building vibration displacement based on visual processing, belonging to the field of visual measurement, including: image enhancement: extracting image pixel gradients, fusing pixel gradients and intensities to generate fusion images; image matching: using phase correlation In this method, the displacement of two related images in the space domain is converted into a linear phase difference in the frequency domain, and the time domain signal is transformed into the frequency domain by using the fast Fourier transform (FFT), and the interaction between the template and the target image is obtained in the frequency domain. power spectrum, and then perform IFFT transformation on the cross-power spectrum to obtain a Dirac function, that is, an impulse function, and then find the peak coordinates of the Dirac function to obtain the displacement at the entire pixel level; sub-pixel interpolation method: use The sub-pixel interpolation method makes the measurement result of the displacement reach the sub-pixel level. The invention avoids the loss of the gradient information, enhances the edge information of the image, has faster operation speed and higher measurement result precision.

Description

technical field [0001] The invention belongs to the field of visual measurement, in particular to a method for measuring building vibration displacement based on visual processing. Background technique [0002] Earthquake is one of the natural disasters with strong destructive force. Even after a small earthquake, no building collapse will cause a certain degree of damage to the structure of the building. This kind of damage will be further aggravated in continuous aftershocks or other natural environments, so the monitoring of building damage is particularly important. When low-frequency structures such as buildings vibrate, the lateral movement has a greater destructive force on the building structure. Therefore, in engineering, people pay more attention to the relative displacement of lateral motion when the building vibrates. [0003] Displacement measurement methods can be divided into two types according to the installation method: contact type and non-contact type....

AI Technical Summary

Problems solved by technology

However, in the process of gradient information quantization, these two methods will cause a certain degree of loss to the original image information, which will also affect the matching accuracy of the image, and the EEM algorithm uses the normalized cross-correlation method for matching operations. Large amount, slow matching speed

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