Distortion compensation method for high-precision point cloud model
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摘要:
点云模型的准确获取与畸变补偿是三维激光扫描技术检测零部件的关键. 提出一种通过畸变补偿获得高精度三维点云模型方法. 利用线激光重构零部件三维点云模型，对模型中存在的夹角误差进行畸变补偿，实现高精度的点云数据获取. 搭建试验平台，选取仪表部件、双层孔件及栅极组件等不同材质及结构的试验对象，通过对比分析发现，畸变补偿后的均方根差分别减少0.009、0.036、0.024 mm. 结果表明点云模型畸变补偿方法有效，同时具有很好的通用性.
Abstract:Accurate acquisition and distortion compensation of point cloud model was the key to 3D laser scanning technology for inspection of parts. A method of obtaining high-precision 3D point cloud model by distortion compensation is proposed. The 3D point cloud model of parts was reconstructed by using a line laser, and the distortion compensation was applied to the included angle error in the model to achieve high-precision point cloud data acquisition. The test platform was established, and the test objects with different materials and structures were selected such as instrument parts, double-layer hole parts and grid components. Through comparative analysis, it has been found that the root-mean-square differences after the distortion compensation were reduced by 0.009, 0.036 and 0.024 mm respectively. The results verified the effectiveness of the distortion compensation method for the point cloud model and its good generality.
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Key words:
- line laser /
- point cloud model /
- distortion compensation
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图 4 倾斜角
$ {\theta _x} $ 、$ {\theta _y} $ 、$ {\theta _z} $ 计算原理示意图Figure 4. Calculation principle diagram of inclination angle
$ {\theta _x} $ 、$ {\theta _y} $ 、$ {\theta _z} $ 
图 7 点云模型畸变补偿前后对比
Figure 7. Comparison of point cloud model before and after distortion compensation
表 1 双层孔件相关参数
Table 1. Relevant parameters of double-layer hole parts
mm 双层孔件底部底座与
球孔面存在高度差L1遮挡造成点云数据缺
失部分的长度L2深度信息差L3 相机线宽L4 每次点云扫描的
理论宽度L5每次点云扫描的
实际宽度L65.000 3.010 12×10−3 16.000 16.000 16.006 
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表 2 双层孔件线激光扫描倾斜角
Table 2. linear laser scanning inclination angle of double-layer hole parts
(°) 线激光入射角 倾斜角$ {\theta _x} $ 倾斜角$ {\theta _y} $ 倾斜角$ {\theta _z} $ 35.000 4.000 0.040 1.569
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表 3 双层孔件的测量结果
Table 3. Measurement results of double-layer hole parts
mm 畸变补偿 尺寸参数 标准值 试验1 试验2 试验3 试验4 试验5 均方根差 补偿前 大孔直径
小孔直径
孔面长度
孔面宽度30.00
20.00
50.00
50.0029.85
19.82
49.88
50.1229.78
19.87
49.88
50.1029.78
19.83
49.91
50.1029.85
19.87
49.89
50.1429.72
19.82
49.91
50.080.21
0.16
0.10
0.11补偿后 大孔直径
小孔直径
孔面长度
孔面宽度30.00
20.00
50.00
50.0029.88
19.90
49.98
50.0129.82
19.90
49.99
50.0329.84
19.87
49.97
50.0329.88
19.87
49.98
50.0129.80
19.86
49.98
50.020.16
0.12
0.02
0.02
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