Measurement Error and Fitting Accuracy of Fringe Structured Light System

Aiming at the influence of fringe structured light system on the fitting result from the measurement error, an error determination method based on measurement circumstance is proposed in this study. First, the height measurement error under different lighting conditions and measurement distances is counted. Then, the probability density function is obtained using parametric or non-parametric fitting. The abovementioned error combined with the plane measurement error is added to the ideal plane model. Finally, the normal vector and fixed point coordinates arc calculated using the least square method. Experiment results show that the model parameters calculated using the proposed method arc consistent with those from the actual measurement. The vector and coordinate errors arc less than 0. 001 rad and 0.233 mm, respectively. The proposed method can effectively solve the low accuracy problem of the measurement results of the fringe projection structured light system in different environments. In addition, it can cope with situations wherein it is difficult for an actual point cloud to achieve high-precision fitting owing to data loss, which provides a basis for subsequent error corrections.