三步空域准相移技术是一种单帧相位解调技术,适用于动态条纹相位分析。本文在已有的三步空域准相移技术的基础上,提出了一种改进的三步空域准相移技术。改进后,在计算每个像素点相位时,可以根据具体情况,灵活选择邻域范围,调节所使用像素点的个数,有利于噪声的隔离,避免误差的传播,从而提高动态条纹分析中相位解调的精度。 The three-step airspace quasi-phase shift technique is a single-frame phase demodulation technique that is suitable for dynamic fringe phase analysis. Based on the existing three-step airspace quasi-phase shift technique, this paper proposes an improved three-step airspace quasi-phase shift technique. After the improvement, when calculating the phase of each pixel, the range of the neighborhood can be flexibly selected according to the specific situation, and the number of the used pixels is adjusted, which is good for the noise isolation and the propagation of the error so as to improve the phase in the dynamic fringe analysis Demodulation accuracy.