In the optical three-dimensional measurements of complex objects, the process of phase unwrapping affects the measurement accuracy and measurement speed. To avoid phase unwrapping, S-transform and sub-pixel matching are applied. Firstly, a digital fringe pattern is projected to an object and the wrapped phase can be extracted. Secondly, an initial parallax is calculated based on the deformed fringe pattern. According to the principle of stereo vision, candidate matching points can be calculated. Thirdly, phase slope function can be defined and the edge points can be confirmed from the phase slope. Finally, the sub-pixel parallax is calculated and 3D information can be obtained based on system calibration parameters. Experiments and results verify that the proposed method can provide high-speed and accurate 3D information, especially for discontinuous objects and shiny objects.

在复杂物体的光学三维测量中，相位展开过程会影响测量精度和测量速度。为了避免相位解缠，应用了 S 变换和子像素匹配。首先，将数字条纹图案投影到物体上，然后提取包裹相位。其次，基于变形的条纹图案计算初始视差。根据立体视觉原理，可以计算出候选匹配点。第三，可以定义相位斜率函数，并从相位斜率确定边缘点。最后，根据系统校准参数计算亚像素视差并获得3D信息。实验和结果验证了所提出的方法可以提供高速准确的 3D 信息，