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CN-122015776-A - Bridge pier displacement measurement system and method based on remote video monitoring

CN122015776ACN 122015776 ACN122015776 ACN 122015776ACN-122015776-A

Abstract

The invention discloses a bridge pier displacement measurement system based on remote video monitoring, which comprises an automatic focusing tripod head camera and a target arranged on a bridge pier, wherein the automatic focusing tripod head camera comprises an embedded main board, an industrial camera, an electric focusing lens, an electric tripod head and an encoder, the embedded main board is connected with the industrial camera through a network, the embedded main board is connected with the electric focusing lens and the electric tripod head through an RS485 interface, the encoder is connected to the electric tripod head, the rotation angle of the target relative to a reference position is measured by means of the electric tripod head, the spatial coordinates of the target can be calculated, so that the displacement amounts of the target in the horizontal direction, the vertical direction, the front direction and the rear direction can be calculated, the measurement of the spatial displacement of the target can be realized, the measurement of sinking, displacement and inclination of the bridge pier can be realized, and the technical problem that the total station and a measurement robot are limited in use in the prior art is solved.

Inventors

  • CUI PENGGANG
  • SUN WENLONG
  • WU ZHAOYU

Assignees

  • 陕西海嵘工程试验检测股份有限公司

Dates

Publication Date
20260512
Application Date
20260202

Claims (4)

  1. 1. The bridge pier displacement measurement system based on remote video monitoring comprises an automatic focusing tripod head camera and a target arranged on a bridge pier, and is characterized in that the automatic focusing tripod head camera comprises an embedded main board, an industrial camera, an electric focusing lens, an electric tripod head and an encoder, wherein the embedded main board is connected with the industrial camera through a network, the embedded main board is connected with the electric focusing lens and the electric tripod head through an RS485 interface, and the encoder is connected with the electric tripod head; The pattern of target is the circle that is located the target center and is located four circles of focusing of target four corners respectively, and four circles of focusing form the rectangle side length equal.
  2. 2. The bridge pier displacement measurement system based on remote video monitoring of claim 1, wherein the distance between the auto-focusing pan-tilt camera and the target is less than 100m.
  3. 3. The bridge pier displacement measurement method based on remote video monitoring is based on the bridge pier displacement measurement system based on remote video monitoring as claimed in claim 1 or 2, and is characterized by comprising the following steps: S1, establishing an image coordinate system by taking the center of a camera image as an origin, taking the horizontal direction as an x-axis and taking the vertical direction as a y-axis, adjusting the focal length f of an industrial camera to obtain a clear image of a target pattern, adjusting an electric cradle head to enable the center of the target in the industrial camera to coincide with the center of the camera image, and enabling the center of the target to be positioned under the image coordinate system As a reference position; s2, on the basis of an image coordinate system, establishing a camera coordinate system by taking the connecting line direction of the industrial camera and the target as a z axis, so as to obtain the target coordinate in the camera coordinate system as Calculating the distance of the target to the industrial camera according to formula (1) Obtaining the coordinates of the target as ; (1) Wherein: f is the focal length of the camera, mm; H is the diameter of the target, mm; h is the imaging height of the target in the industrial camera, mm; S3, the industrial camera acquires a camera image of the current position of the target in real time, and detects the position of the center of the target under an image coordinate system Calculating the distance from the current target to the industrial camera Obtaining the coordinates of the current target in a camera coordinate system as ; (2) Wherein: f is the focal length of the camera, mm; H is the diameter of the target, mm; h is the imaging height of the target in the industrial camera, mm; S4, judging the position With reference position If the bridge piers are overlapped, if the bridge piers are not displaced, the electric cradle head is adjusted to enable the reference position in the industrial camera Move to the position The rotation angle of the electric cradle head on the x axis is obtained through the encoder And rotation angle on y-axis ; S5, calculating the position according to the following formula And (3) with Is the coordinate difference of (2) 、 And The displacement of the target is obtained, and the displacement of the bridge pier is obtained; 。
  4. 4. The bridge pier displacement measurement method based on remote video monitoring as claimed in claim 3, wherein in S1, the focal length f of the industrial camera is adjusted, and the obtaining of the clear image of the target pattern is specifically: s1, detecting the center distances of four focusing circles 、 、 And The standard deviation was obtained according to the following calculation ; S2, calculating the ratio of standard deviation to average value according to the following formula Judging the ratio If the image is smaller than 0.01, the camera image is clear, if the image is not clear, the camera image is not clear; 。

Description

Bridge pier displacement measurement system and method based on remote video monitoring Technical Field The invention belongs to the field of civil engineering monitoring and measurement, relates to a displacement measurement method, and in particular relates to a pier displacement measurement system and method based on remote video monitoring. Background In the field of civil engineering, monitoring and measuring are carried out on a construction tunnel, a pile foundation and the like according to construction specifications, and abnormality such as vault sinking, clearance convergence, settlement and the like is found in time, so that the method is an important means for guaranteeing construction quality and construction safety. The main mode of monitoring and measuring at present is to measure the displacement of various targets through a total station and a measuring robot (full-automatic total station). The total station is used for manual measurement, the measurement process is complex, the measurement frequency is limited, and long-time continuous measurement cannot be realized. The measuring robot can realize automatic measurement, but the measuring robot is expensive and cannot be used on a large scale. For monitoring measurement which does not need coordinate information of a target point and only needs displacement information of the target point, the total station is not suitable for measurement. Traditional video monitoring measurement system adopts fixed focus camera lens, can only monitor to fixed pier observation point, surpasses this distance scope because camera focus restriction can't clear formation of image, leads to the system to be unable to use. The imaging definition of the target pattern restricts the measuring precision of the target position, and the traditional lens automatic focusing method focuses by detecting the definition of the edge of the image contour, is limited by the complexity of the contour of the imaged object, and is difficult to achieve ideal definition. The video monitoring and measuring system adopting the plane camera can only acquire the displacement of the target in the horizontal and vertical directions through the camera, so that only the sinking and displacement of the bridge pier can be measured. Based on the above situation, a pier displacement measurement system and method based on remote video monitoring are needed to solve the above technical drawbacks. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a pier displacement measurement system and a pier displacement measurement method based on remote video monitoring, which are used for solving the technical problem that a total station and a measurement robot in the prior art are limited in use. In order to solve the technical problems, the invention adopts the following technical scheme: The bridge pier displacement measurement system based on remote video monitoring comprises an automatic focusing tripod head camera and a target arranged on a bridge pier, wherein the automatic focusing tripod head camera comprises an embedded main board, an industrial camera, an electric focusing lens, an electric tripod head and an encoder, the embedded main board is connected with the industrial camera through a network, the embedded main board is connected with the electric focusing lens and the electric tripod head through an RS485 interface, and the encoder is connected with the electric tripod head; The pattern of target is the circle that is located the target center and is located four circles of focusing of target four corners respectively, and four circles of focusing form the rectangle side length equal. The distance between the automatic focusing tripod head camera and the target is smaller than 100m. A bridge pier displacement measurement method based on remote video monitoring is based on the bridge pier displacement measurement system based on remote video monitoring, and specifically comprises the following steps: S1, establishing an image coordinate system by taking the center of a camera image as an origin, taking the horizontal direction as an x-axis and taking the vertical direction as a y-axis, adjusting the focal length f of an industrial camera to obtain a clear image of a target pattern, adjusting an electric cradle head to enable the center of the target in the industrial camera to coincide with the center of the camera image, and enabling the center of the target to be positioned under the image coordinate system As a reference position; s2, on the basis of an image coordinate system, establishing a camera coordinate system by taking the connecting line direction of the industrial camera and the target as a z axis, so as to obtain the target coordinate in the camera coordinate system as Calculating the distance of the target to the industrial camera according to formula (1)Obtaining the coordinates of the target as; (1) Wherein: f is the focal len