Abstract:

The measurement of scattered point cloud data is the foundation of surface reconstruction of a 3D object. This paper analyzes the principle of 3D measurement and proposes a novel 3D measurement and calibration method based on the grating projection by adopting the technologies of Gray code and phase shifting. A code-revising algorithm is also developed to deal with the error possibly caused by the image noise during the decoding process. The proposed measurement method possesses the advantages of both Gray code and phase shifting, so it is of simple coding, large measured range, strong jamming resistance, high resolution and good suitability for the object with continuous surface in small range. Experimental results show that the proposed method is of good practicality and stability because it may result in regular scattered point cloud data with high quality.

Key words: surface reconstruction, scattered point cloud, 3D measurement, structured light, Gray code, phase shifting