A 3D Reconstruction Method Based on Half-peak Probability Density Distribution
A probability density distribution and three-dimensional reconstruction technology, applied in the field of three-dimensional reconstruction based on half-peak probability density distribution, to achieve the effect of large amount of data acquisition and comprehensive point cloud sampling
Active Publication Date: 2021-07-30
ZHEJIANG UNIV
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Most of the research on point cloud 3D reconstruction technology is focused on parts reverse engineering, ancient building scanning and medical imaging, and there is no application of this technology in the field of nuclear power
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[0047] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings. It should be noted that the specific implementation is only a detailed description of the present invention and should not be regarded as a limitation of the present invention.
[0048] The present invention provides a three-dimensional reconstruction method based on the half-peak probability density distribution, such as figure 1 As shown, it specifically includes the following steps:
[0049] (1) slice the 3D point cloud along the Z-axis direction to obtain N spatial layers;
[0050] (2) Extract the scattered point information in the i-th spatial layer and project it to Z i flat;
[0051] (3) Build Z i The membership function of each grid and scatter point in the plane, and draw a three-dimensional probability density map;
[0052] (4) Through the half-peak value of the three-dimensional probability density map w max / 2 Make a plan...
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The invention discloses a three-dimensional reconstruction method based on half-peak probability density distribution, comprising the following steps: slice the three-dimensional point cloud along the Z-axis direction to obtain N spatial layers; extract scattered point information in the i-th spatial layer and Project to Z i plane; build Z i The membership function of each grid and scatter point on the plane, draw a three-dimensional probability density map; pass the half-peak value of the three-dimensional probability density map w max / 2 Make a plane parallel to the XOY plane, and obtain the contour L after intersecting the plane with the three-dimensional probability density map XY , the profile L XY Reconstruct the outline of the radioactive source corresponding to the i-th spatial layer; sequentially superimpose the reconstructed outline of the radioactive source corresponding to the N spatial layers to obtain a three-dimensional reconstruction model of the radioactive source. The method of the invention can be applied to the field of nuclear power, and can realize rapid reconstruction of radioactive sources after nuclear accidents and accurate reconstruction of outlines of decommissioned radioactive sources.
Description
technical field [0001] The invention relates to the technical field of signal processing, in particular to a three-dimensional reconstruction method based on half-peak probability density distribution. Background technique [0002] Nuclear energy has become the third largest energy source in the world, and the continuous nuclear accidents make nuclear safety a major problem that needs to be solved urgently. [0003] Every nuclear accident will bring irreparable casualties and economic losses. In the field of nuclear power, there are currently two major needs: first, to find and deal with radioactive sources as soon as an accident occurs. Due to the unscientific nuclear emergency plan and untimely treatment of radioactive sources, a large amount of nuclear wastewater produced by the Fukushima nuclear accident flowed into the Pacific Ocean, and radioactive substances spread to some countries in East Asia through the atmosphere. This is harmful to the ecological environment of...
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IPC IPC(8): G06T17/00
CPCG06T17/00
Inventor 从飞云李慧敏童水光
Owner ZHEJIANG UNIV