结构光在三维形貌测量中应用十分广泛,但对于表面反射率较高的物体,对其投影一定强度的结构光,易在被测物表面形成局部亮度饱和,使得该区域在重建过程中出现较大误差甚至无法重建。为了提高表面高反射率物体的三维重建质量,提出了一种基于分区投射的结构光饱和区域主动补偿方法。首先通过投射区域格雷编码灰度图计算饱和区域在投影平面的位置。然后增加过渡补偿区域,平滑降低饱和区域的条纹光栅投射强度。最后,通过实验对饱和区域分区投射优化补偿方法进行了验证。结果表明,所提方法能够减少计算补偿区域所需投影图片的数量,实现饱和区域边界平滑过渡,提高计算效率,有效抑制亮度饱和引起的重建误差,提高三维重建精度。

The structured light is widely used in 3D surface shape measurement. However, it is likely to cause the intensity saturation when projecting certain intensity structured light to the surface with high reflection. The intensity saturation always causes the reconstructed surface with large errors and even hard to be reconstructed. In order to improve the quality of 3D reconstruction of high reflective objects, an active compensation method base on light intensity divisional projection is proposed. Firstly, the position of the saturated region in the projection plane is calculated by the Gray code grayscales in the projection area. Then, the transition compensation region is proposed to reduce the projection intensity of the fringe pattern in the saturated region smoothly. Finally, the divisional projection optimized compensation method for saturated region is verified by the experiments. The experimental results show that the proposed method can reduce the number of projected images needed to calculate the compensation region, achieve a smooth transition of the saturated region boundary, improve the computational efficiency, effectively suppress the reconstruction error caused by the saturation, and improve the accuracy of the 3D reconstruction.