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Pipeline measurement method based on multi-view vision

A multi-eye vision and measurement method technology, applied in the field of visual measurement, can solve the problems of complex process, high cost, low precision, etc., and achieve the effect of solving the complex measurement process

Active Publication Date: 2020-02-07
NANJING UNIV
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Problems solved by technology

[0006] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a pipeline measurement method and system based on multi-eye vision to solve the problems of complex process, high cost and low precision in the current pipeline measurement technology

Method used

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  • Pipeline measurement method based on multi-view vision

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specific Embodiment

[0050] (1) Image acquisition and preprocessing

[0051] First build the image acquisition system, use a steel platform with a length of about 1.5m as the frame of the image acquisition system, and lay a light-emitting board at the bottom of the frame to eliminate the shadows caused by high-level light source lighting and simplify the image processing of the pipeline background. operate. If the desktop is used as the stage, the texture information on the desktop will cause great trouble. The strong light of the luminous board can make the background of the pipe picture close to white.

[0052] According to the accuracy analysis of the 3D reconstruction simulation of the ideal polyline segment, the image acquisition module needs to use a camera with at least 5 million pixels. Place the camera in the system frame, such as Figure 1-2 As shown, a camera is placed at the front and rear respectively to form a pair of camera groups. Take pictures of the pipelines to be measured pl...

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Abstract

The invention discloses a pipeline measurement method based on multi-view vision. The method is composed of four parts of image acquisition and preprocessing, center line and outer diameter extraction, camera calibration and camera matrix conversion, pipeline center line matching and outer diameter expansion. A camera is placed on a built measurement frame to carry out image acquisition and preprocessing and acquire a pipeline gray scale picture. The method comprises the following steps of acquiring a pipeline center line by applying distance transformation and a minimum path method, extracting feature points of the pipeline center line, and discretizing the feature points; calibrating the corresponding binocular cameras (a front side camera and a rear side camera), and obtaining a conversion matrix from a rear side camera coordinate system to a front side camera coordinate system; and recovering three-dimensional information of the pipeline center line by adopting a dynamic matchingmethod according to the obtained center line feature points and the camera calibration parameters, expanding outer diameter information obtained by processing pictures shot from different viewing angles on the three-dimensional pipeline center line, and finally obtaining the spatial position of the pipeline center line and the corresponding outer diameter information.

Description

technical field [0001] The invention relates to the technical field of visual measurement, and mainly relates to a pipeline measurement method based on multi-eye vision. Background technique [0002] Piping systems are widely used in nuclear reactors, aviation, aerospace, ships and automobile industries. They are responsible for the transmission and measurement of gases, liquids and other media. They are an important part of high-end electromechanical products. Security has an important impact. Therefore, high-precision pipeline processing is a hot issue at present. [0003] The spatial geometric shape measurement after pipeline processing mainly adopts profiling method, three-coordinate measuring instrument and measurement method based on laser CCD device. The profiling method can only roughly check the shape of the pipeline, but cannot accurately measure the position of the end points of the pipeline and the distance between the end points. Although the three-coordinate...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T7/13G06T7/62G06T7/80G01B11/08G01C11/00
CPCG06T7/0004G06T7/13G06T7/62G06T7/80G01B11/08G01C11/00G06T2207/30164
Inventor 王健李明洲方定君吕琦
Owner NANJING UNIV
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