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Method for recognizing rain-wind induced vibration waterline of stayed cable based on computer vision

A computer vision and recognition method technology, applied in computer parts, calculations, character and pattern recognition, etc., can solve the problems of complex measuring instruments, large measurement errors, and difficulty in obtaining information on the axial distribution of the waterline, and achieve high measurement accuracy. , The effect of small identification error and simple installation

Active Publication Date: 2017-11-10
哈尔滨工业大学人工智能研究院有限公司
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Problems solved by technology

[0004] In order to overcome the shortcomings of traditional methods such as large measurement errors, complex measuring instruments, and difficulty in obtaining information on the distribution of waterlines along the axial direction of the cables, the present invention proposes a computer vision-based waterline recognition method for wind and rain-induced vibrations of cable-stayed cables, so as to realize waterline monitoring. Non-contact Measurement of Surface Morphological Evolution Process of Wire on Cable

Method used

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  • Method for recognizing rain-wind induced vibration waterline of stayed cable based on computer vision
  • Method for recognizing rain-wind induced vibration waterline of stayed cable based on computer vision
  • Method for recognizing rain-wind induced vibration waterline of stayed cable based on computer vision

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Embodiment 1

[0049] A computer vision-based waterline identification method for wind and rain-induced vibration of cable-stayed cables is as follows:

[0050] The surface of the stay cable is wrapped with yellow PVC film material, and a waterline positioning grid composed of axial and transverse coordinate lines along the cable is set on the surface of the stay cable. The red waterline is formed by mixing red dye in the water, and then passed through the high-speed CCD The camera shoots the moving image of the waterline on the stay cable. The original waterline image adopts the RGB color model. Since there is an obvious color difference between the waterline and the surface of the stay cable, the threshold ε is defined:

[0051] ε(x,y)=R(x,y)-B(x,y)+R(x,y)-G(x,y) (1)

[0052] In the formula, R(x, y), G(x, y) and B(x, y) respectively represent the red, green and blue color channels corresponding to the pixel point (x, y) in the original image using the RGB color model The value of , the area...

Embodiment 2

[0080] In this embodiment, the formula in Embodiment 1 is used to set the measurement area on the surface of the stay cable, and draw a coordinate grid system such as figure 1 As shown, the waterline motion image on the stay cable is captured by a high-speed CCD camera as shown in figure 2 shown. The flow chart of the image processing algorithm designed in this embodiment is shown in image 3 . The specific waterline identification method is as follows:

[0081] According to formula (1) and formula (2), the waterline is identified from the original picture based on the color difference comparison, such as Figure 4 shown;

[0082] According to formula (3) based on the modified grayscale calculation formula, the original image is converted into a grayscale image with waterline color removed, such as Figure 5 shown;

[0083] According to the formula (4), the grayscale image is converted into a binary image with only the coordinate grid system based on the grayscale thre...

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Abstract

The invention provides a method is for recognizing rain-wind induced vibration waterline of a stayed cable based on computer vision. The method is characterized in that non-contact measurement is realized for evolution of the form of the waterline through an image recognition algorithm. With the method, a measurement region is arranged on the surface of the stayed cable, a coordinate grid system is drawn, the movement pictures of the waterline in the measurement region are shot through a high-speed CCD camera, and first, according to color difference contrasting, the water line is recognized from an original picture; then through grayscale correction and a gray threshold method, a binary image of the coordinate grid system is obtained, and all coordinate lines are expressed through equations based on Hough conversion and least square fit; finally, the distribution position of the waterline on the surface of the cable is determined through the coordinate grid system. With the method, the movement pictures of the waterline shot constantly are recognized, and then the evolution process of the form of the waterline can be reconstructed. The method has the advantages of being wide in measurement range, obtaining much waterline information and being high in precision, and a device is simple, convenient and rapid to operate and easy to transplant to application of actual bridge engineering.

Description

technical field [0001] The invention relates to a computer vision-based waterline recognition method for wind and rain-induced vibration of cable stays. Background technique [0002] Under the joint action of wind and rain, the cables of cable-stayed bridges will vibrate violently and with large magnitudes, which is called wind-rain-induced vibration. Among several types of wind-induced vibrations of cables, wind and rain induced vibrations are the most damaging to cables and cause the most serious consequences. The study found that an important factor that induces wind and rain-induced vibration is the formation of a waterline that vibrates in a circular direction on the surface of the cable. However, due to unfavorable factors such as complex measurement environment and small waterline size, it is very difficult to measure the waterline accurately. At present, there are mainly two methods for waterline measurement: one is to measure the waterline thickness at the sensor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C11/04G06K9/20G06K9/34G06K9/46
CPCG01C11/04G06V10/22G06V10/267G06V10/56
Inventor 陈文礼李惠李文杰程鹏
Owner 哈尔滨工业大学人工智能研究院有限公司
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