The Effect of Surface Structured Light's Phase-Shift on 3D Measurement Accuracy

In the field of 3D vision measurement, surface structured light measurement is a new active technology, which can be widely used in the field of non-contact 3D modeling. Through the analysis of the mathematical model of the surface structured light system, a key point for the accuracy of 3D measurement is whether the spatial coordinates of pixels in encoding patterns can be accurately obtained, which is also the standard to judge the quality of coding method. Therefore, the paper adopts a coding method combining Gray code with Phase-Shift patterns. Simultaneously, a 3D vision measurement system composing a single digital camera and a single digital projector is constructed. This method is proved not only to improve the accuracy of 3D measurement, but also to be more efficient than only Gray coding method, which is apt in oil painting scanning with 3D reproduction, incomplete cultural relic's repair and construction of 3D geological model etc.