考虑镜面反射和阴影的复杂曲面测量视点规划

View Planning for Complex Surface Measurement Considering Specular Reflections and Shadows

针对复杂曲面金属零件三维形貌测量的反光与自遮挡现象,提出一种面向复杂曲面光学测量的视点规划方法。方法具体分析了光线可达角度约束、视场和投影域约束、景深约束、遮挡约束和灰度值约束(反光或阴影),并定义测量质量参数,结合测量覆盖率,建立了复杂曲面测量视点规划模型。由于模型的可行域空间庞大,提出了由基于生成再检测模式的粗规划和基于可视锥的精规划组成的视点规划求解方法,最后根据实际测量环境对叶轮离散模型进行了仿真研究得到测量视点,并通过实测试验验证仿真结果。结果表明:仿真结果的测量覆盖率可达96.19%,测量质量指标可达85.24%,实际试验能完整重构出叶轮形貌,验证了方法的可行性。

Aiming at the reflection and self-occlusion phenomena in 3D topography measurement of complex metal parts,a multi-view visual measurement point planning method for complex surfaces is proposed.Constraints about angle of the reachable light,field of view,depth of field,occlusion and gray value(reflection or shadow)are analyzed in detail.Also measurement quality parameters are defined.Combined with the measurement coverage,the measurement point planning model of complex surface vision is established.Given the feasible region of the model is large,initial coarse planning and subsequent stage of fine planning are developed.The coarse planning is based on generate&test while fine planning is based upon the visual cone.Finally,experiments are carried out on a turbine impeller.The results show that the proposed method can produce measurement coverage of 96.19%,and the measurement quality index can reach 85.24%.The actual test can reconstruct the morphology of the impeller,which verifies the feasibility of the developed method.