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Method for acquiring three-dimensional point cloud model of tunnel face

A technology of three-dimensional point cloud and acquisition method, which is applied in the direction of measuring devices, instruments, surveying and navigation, etc., can solve problems affecting rock mass feature recognition, and achieve the effect of fast and convenient operation steps, high precision and simple operation

Active Publication Date: 2015-07-29
ANHUI TRANSPORTATION HLDG GRP CO LTD +1
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Problems solved by technology

These few burrs have a great impact on the overall effect of the reconstructed object, and once there are many of these points, it will even affect the subsequent identification of rock mass features

Method used

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  • Method for acquiring three-dimensional point cloud model of tunnel face
  • Method for acquiring three-dimensional point cloud model of tunnel face
  • Method for acquiring three-dimensional point cloud model of tunnel face

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Experimental program
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Embodiment

[0039] Such as figure 1 As shown, a method for obtaining a three-dimensional point cloud model of a tunnel face includes the following steps:

[0040] 1) Choose the shooting camera according to the shooting environment inside the tunnel. In close-range photogrammetry, cameras can be divided into measuring cameras and non-measuring cameras. The main difference between the two is whether the internal parameters of the camera are fixed. The internal parameters are locked when the measuring camera is produced and the internal parameter matrix is ​​obtained through calibration, which has high accuracy, but due to the fixed internal parameters, the applicable occasions have more restrictive conditions and the price is more expensive. Non-measurement cameras, that is, ordinary digital cameras, are slightly inferior in terms of accuracy and distortion control, but the internal parameters of the camera can be adjusted freely, with a wide range of applications and low prices. The photograp...

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Abstract

The invention relates to a method for acquiring a three-dimensional point cloud model of a tunnel face. The method comprises steps as follows: 1) selecting a shooting camera according to the shooting environment inside a tunnel; 2) determining shooting time of the camera in tunnel circulating construction procedures; 3) determining the shooting position of the camera and the position of a light source; 4) determining shooting parameters of the camera with a field test method according to the shooting environment inside the tunnel; 5) shooting and processing left and right images to obtain the three-dimensional point cloud model of the face. Compared with the prior art, the method has the advantages of high precision, low cost, rapidness, convenience, high operability, wide application range, high repeatability and the like.

Description

Technical field [0001] The invention relates to a method for obtaining a three-dimensional point cloud model, in particular to a method for obtaining a three-dimensional point cloud model of a tunnel face. Background technique [0002] The excavation surface formed in the process of tunnel excavation will reveal a lot of geological information, but it is not easy to quickly extract useful information from it and analyze it. The construction site is restricted by various factors, and it is usually not allowed to spend too much time on the construction site to observe and analyze the tunnel excavation surface. In addition, limited by technical conditions, in most cases, geotechnical personnel still use traditional tools such as tape measure, geological compass, and vernier caliper to make contact measurements on site. In the process of collecting data, geological engineers need to be directly exposed to rock slides, rock bursts and unstable rock masses. Artificial geological sketc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C11/00
CPCG01C11/00
Inventor 李晓军陈建琴朱合华林浩洪弼宸
Owner ANHUI TRANSPORTATION HLDG GRP CO LTD
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