关键词: 结构光, 标定, 交比不变, 圆钢测量

Abstract: To improve the measuring accuracy of the structured lights system, the errors caused by two light planes are analyzed in this paper. Moreover, as the mechanical adjustment produces a low precision, a new approach to adjust the position of the planes is proposed. The approach is based on cross ratio invariability and to a great extent reduces the errors mentioned above. Therefore, experiment platforms including sensor calibration and light plane adjustment are established. It turns out that the repeatable accuracy is within 0.1 mm and the relative accuracy is less than 0.1%. Compared with the mechanical adjustment method, the measuring accuracy is improved by 0.082 mm when the new method is applied in the system, which proves the feasibility of the new method for light plane adjustment.

Key words: structure light, calibrate, cross ratio invariability, cylinder measurement