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Tunnel orthographic image acquisition system based on laser radar LIDAR point cloud data and tunnel orthographic image acquisition method thereof

A point cloud data and lidar technology, applied in image data processing, image enhancement, image analysis, etc., can solve the problems of distortion and distortion of panoramic images, unable to reflect the real size of the inner wall of the actual mileage of the tunnel, etc.

Active Publication Date: 2016-11-16
南京数联空间测绘科技有限公司
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Problems solved by technology

Ordinary tunnel panorama images are distorted and distorted, which cannot reflect the true mileage of the tunnel and the true size of the inner wall

Method used

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  • Tunnel orthographic image acquisition system based on laser radar LIDAR point cloud data and tunnel orthographic image acquisition method thereof
  • Tunnel orthographic image acquisition system based on laser radar LIDAR point cloud data and tunnel orthographic image acquisition method thereof
  • Tunnel orthographic image acquisition system based on laser radar LIDAR point cloud data and tunnel orthographic image acquisition method thereof

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Embodiment Construction

[0038] The present invention will be further explained below in conjunction with the accompanying drawings.

[0039] The invention provides a system for obtaining tunnel orthophotos based on laser radar point cloud data, including a point cloud file input module, a point cloud data management module, a point cloud data projection processing module, a laser radar image generation module, and a laser radar flatness Module and Imaging Results Reporting Module.

[0040] Among them, the point cloud file input module takes the original 3D point cloud data set RD(N k ,E k ,H k ,RL k ), through the tunnel skeleton line mileage projection method to get the tunnel skeleton line mileage M of point k k ; then follow the M k The segmented mileage length range divides the original 3D point cloud dataset RD into multiple point cloud segmented datasets ND j (M i ,N i ,E i ,H i ,RL i ), where N k The north coordinate of the skeleton line coordinate system corresponding to the kth l...

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Abstract

The invention discloses a tunnel orthographic image acquisition system based on laser radar LIDAR point cloud data. The tunnel laser radar point cloud data of any shape design of section contour are unfolded into a measurable laser radar tunnel orthographic image map by using a skeleton line mileage projection method and a section contour projection method, and the image map acts as a reference base map and a target quantity color numerical analysis map is superposed on the image map in a semitransparent mode. The invention also provides a corresponding method. The generated laser radar tunnel orthographic image can truly reflect the measurable image of the size and the position of the internal wall of the tunnel and can generate a tunnel orthographic image map plane user report including "4D" information to visually display the three-dimensional section deformation and flatness of each part of the internal wall of the tunnel to tunnel structure detection users. The length, the width and the area of cracks, water seepage and other tunnel defects can be actually measured so that the geometric size of the defects can be calculated. The scientific basis is provided to assessment and restoration of the tunnel defects and the production efficiency of tunnel detection is greatly enhanced.

Description

technical field [0001] The invention belongs to the technical field of tunnel structure defect detection, in particular to a system and method for acquiring tunnel orthophotos based on LIDAR (commonly known as "three-dimensional laser scanning") point cloud data. Background technique [0002] The development and utilization of underground space is an important direction and characteristic of my country's infrastructure construction, such as subway tunnels, railway tunnels, and highway tunnels. Especially the rapid development of urban underground railways in the past 10 years has also brought new problems. With the continuous increase of the mileage put into operation, the existing traditional tunnel measurement and detection technology and equipment are increasingly unable to keep up with the rapidly growing demand for safety detection of operational tunnel structures. [0003] At present, in China, total stations and two-dimensional section instruments are mainly used for...

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Application Information

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IPC IPC(8): G06T7/00
CPCG06T7/0004G06T2207/10044G06T2207/20068
Inventor 尤相骏
Owner 南京数联空间测绘科技有限公司
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