基于局部光栅补全的反光物体三维重建

3D reconstruction of reflective objects based on local grating completion

针对结构光三维重建过程中,因表面强反光造成光栅形变而导致的相位误差、重建精度降低的问题,提出一种基于局部光栅补全的重建方法。首先对被测物体自身材料特性以及镜面反射角等引发三维重建点云模型缺失现象的反光因素进行分析。其次在相位展开前,引入局部光栅补全法,对反光区光栅丢失部分进行补全,以相移法加互补格雷码重建法为基础提高相位展开精度。最后,通过搭建单目结构光三维重建系统,对平面度误差在0.5mm范围内的反光矩形铝合金板进行三维重建。实验表明,本文提出的改进方法可以有效补全因物体表面反光造成的重建缺失,其相位解码信息更加完备,重建率相较于传统方法提升了25%,平面度误差率降低了28.2%。

Aiming at the problems of phase error and reduced reconstruction accuracy caused by grating deformation caused by strong surface reflection in the process of structured light 3D reconstruction,a reconstruction method based on local grating completion is proposed.Firstly,the reflection factors that cause the missing phenomenon of the 3D reconstructed point cloud model,such as the material properties of the measured object and the angle of specular reflection,are analyzed.Secondly,before the phase unwrapping,the local grating complement method is introduced to complete the missing part of the grating in the reflective area,and the phase unwrapping accuracy is improved based on the phase shift method and the complementary Gray code reconstruction method.Finally,by building a monocular structured light 3D reconstruction system,the 3D reconstruction of the reflective rectangular aluminum alloy plate with a flatness error within 0.5mm is carried out.Experiments show that the improved method proposed in this paper can effectively complement the reconstruction loss caused by the reflection on the surface of the object,and its phase decoding information is more complete.Compared with the traditional method,the reconstruction rate is increased by 25%,and the flatness error rate is reduced by 28.2%.