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Double-visual-angle visual displacement measurement system and method

A technology of displacement measurement and double viewing angle, applied in the field of visual displacement measurement, can solve the problem of slow research progress, and achieve the effect of ensuring accuracy, simple and compact structure, and improving measurement accuracy

Active Publication Date: 2021-06-25
NAT ENG LAB FOR HIGH SPEED RAILWAY CONSTR
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Problems solved by technology

But so far, research on this type of method has been slow, and the existing literature is far from sufficient to fully understand the impact of temperature on visual measurements.

Method used

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Embodiment 1

[0043] like figure 1 , figure 2 Shown is the design idea of ​​the dual-view system proposed by the present invention. With the help of a beam-splitting prism, one camera can observe objects in two different directions. One of the directions is the target used to estimate the displacement of the target to be measured, and the other direction is the photomask used to estimate the system instability error, which will be fixed on the base of the system to ensure its stability . The prerequisite for the dual-view system to work properly is that the images of both the target and the photomask are clear on the sensor. However, the depth of field allowed by the camera is limited. While the image of the target on the camera sensor is clear, the image of the photomask will become blurred because the distance between the target and the camera is usually much larger than the distance between the photomask and the camera. For this reason, the present invention introduces an optical co...

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Abstract

The invention provides a double-visual-angle visual displacement measuring system. The double-visual-angle visual displacement measuring system comprises a base, a sliding rail, clamps, a camera, a beam splitter prism, a convex lens, a photomask, a 90-degree refraction prism, a light source and a target. The sliding rail is vertically mounted on the base; the three clamps are respectively used for clamping the camera, the beam splitter prism and the convex lens; the photomask is placed on the 90-degree refraction prism; after being reflected by the 90-degree refraction prism, horizontal light rays emitted by the light source are projected to the photomask; The target is pasted on the surface of a to-be-measured target. The invention also provides a measuring method, which comprises the following steps of: positioning a light spot, and calculating a homography matrix from a subsequent frame to a reference frame; carrying out homographic transformation to obtain target image coordinates after system instability error correction; and carrying out coordinate transformation to obtain a displacement result. The vision measurement system provided by the invention can simultaneously correct camera movement (camera rotation and translation) and displacement measurement errors caused by temperature change of the image sensor, so that the measurement precision is greatly improved.

Description

technical field [0001] The invention relates to the technical field of visual displacement measurement, in particular to a dual-view visual displacement measurement system and method. Background technique [0002] Health monitoring of engineering structures is a necessary means to prevent facility aging and structural catastrophic failures. Among them, long-term displacement and deformation measurement can effectively reflect changes in the health of engineering structures over time, so it is one of the main contents of daily maintenance and failure assessment of engineering structures. one. At present, the sensors widely used in long-term displacement measurement mainly include linear variable differential transformer (LVDT), global navigation satellite system (GNSS) and other contact sensors, as well as non-contact displacement sensors based on laser technology and computer vision technology. The contact measurement method and cumbersome installation process limit the app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02
CPCG01B11/022
Inventor 余志武戴吾蛟邢磊张云生
Owner NAT ENG LAB FOR HIGH SPEED RAILWAY CONSTR
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