A micro vibration visual measurement method and system

Abstract

The invention discloses a micro-vibration visual measurement method, which acquires multi-frame vibration images in a vibration video stream, sets multiple groups of Gabor wavelet basis functions with different decomposition directions and different scales in complex controllable pyramids, and converts each frame of vibration images Decompose multiple sub-images with different resolutions; obtain the brightness of each pixel in each sub-image in each frame of vibration image, form the brightness sequence of each pixel in the time domain, and obtain the region of interest of each sub-image The phase change amount of each pixel point in two adjacent frames; set the amplification factor for the phase change amount of each pixel point to obtain the brightness information of each pixel point after phase amplification; The luminance information is inversely transformed by the basis function to reconstruct a frame of vibrating image to form an amplified vibrating video stream. The invention can amplify the tiny vibration of the vibrating video stream of the device to obtain a clear video enhancement effect.

Description

technical field [0001] The invention relates to the technical field of visual measurement, in particular to a micro-vibration visual measurement method and system. Background technique [0002] Vibration exists in various engineering applications such as machinery, vehicles, construction, and aerospace. Engineering structures and equipment generate a large number of vibration signals during the operation process, which contains rich information on the internal characteristics of the structure and equipment operating conditions. It is an important information representation that reflects the state of the system and its changing laws, and directly affects the safe operation of engineering structures and equipment. . [0003] From the existing vibration measurement technology, there are two measurement methods: one is contact measurement, and the other is non-contact measurement. Contact measurement requires the sensor to be arranged on the measurement object according to cer...

AI Technical Summary

Problems solved by technology

[0005] Patent CN108830233A The feature enhancement algorithm of this patent is based on the Euler video algorithm. When the vibration feature is enhanced, it will be enhanced together with the noise signal, making the picture excessively blurred and distorted

Patent CN110084127A This patent focuses on the feature recognition and enhancement of the specific application of maglev rotor vibration, and cannot be extended to more general vibration feature recognition scenarios, such as industrial motors, water pumps, fan towers, etc.

Patent CN111277833A This patent needs to manually select the ROI area containing the edge of the vibration target in the video, and then perform operations such as vibration amplification in the marked area, and cannot automatically identify the vibration area and operate it according to the algorithm

Patent CN110553714A This patent uses the principal component decomposition method as a dimension reduction processing method, which needs to preset the change characteristics of image information, and the preset feature is the brightness change caused by vibration, which cannot handle general feature changes

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