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 t... https://www.lightemupsequences.com/hot-choice-Lagoon-Super-Nintendo-Used-Loose-p15945-flash-choice