Method of extracting three-dimensional axis of tunnel based on minimum bounding box algorithm
A technology of three-dimensional axis and bounding box, which is applied in calculation, 3D image processing, image data processing, etc. It can solve the problems of extracting the influence of tunnel diameter and not considering the torsion of tunnel three-dimensional axis, etc., and achieves high speed, high precision and improved automation degree of effect
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[0024] Example: such as figure 1 As shown, this embodiment specifically relates to a method for extracting the three-dimensional axis of a tunnel based on the minimum bounding box algorithm. The method uses the three-dimensional laser scanning tunnel point cloud data to extract the lining ring through a tunnel minimum bounding box algorithm with variable angle steps. Point cloud slices, and then fit the extracted point cloud slices according to the circle (or ellipse) model to solve the central coordinates, and then smooth the tunnel axis through the second-order continuity of the horizontal curve and the second-order continuity of the vertical curve, and finally obtain high precision The three-dimensional axis of the tunnel. It can avoid the arbitrariness of human factors in the traditional operation method, and help to unify the detection method and accuracy of the three-dimensional axis of the tunnel.
[0025] Such as image 3 As shown, in the X-Y-Z coordinate system in t...
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