College of Electronics and Information Engineering, Sichuan University, Chengdu 610065, China.
School of Mechanical Engineering, Sichuan University, Chengdu 610065, China.
Sensors (Basel). 2022 Dec 1;22(23):9388. doi: 10.3390/s22239388.
An improved three-frequency heterodyne synthesis phase unwrapping method is proposed to improve the measurement accuracy through phase difference and phase sum operations. This method can reduce the effect of noise and increase the equivalent phase frequency. According to the distribution found in the phase difference calculation process, the Otsu segmentation is introduced to judge the phase threshold. The equivalent frequency obtained from the phase sum is more than those of all projected fringe patterns. In addition, the appropriate period combinations are also studied. The simulations and related experiments demonstrate the feasibility of the proposed method and the ability to improve the accuracy of the measurement results further.
提出了一种改进的三频外差合成相位解缠方法，通过相位差和相位和运算来提高测量精度。该方法可以降低噪声的影响，并增加等效相位频率。根据在相位差计算过程中发现的分布，引入了 Otsu 分割来判断相位阈值。从相位和中获得的等效频率比所有投影条纹图案的等效频率都高。此外，还研究了适当的周期组合。模拟和相关实验验证了所提出方法的可行性以及进一步提高测量结果精度的能力。
