结合极线约束和散斑相关的实时三维测量方法

Real-Time Three-Dimensional Measurement Composite of Epipolar Constraint and Speckle Correlation

提出了一种结合极线约束和散斑相关的实时三维测量方法。该方法基于标准的三步相移法,向正弦条纹图像中嵌入额外的随机数字散斑,并结合左右相机之间的极限约束来确定每个像素点相位的周期数,最终利用3幅条纹图像实现无歧义的相位展开。实测结果表明,相比于传统信息嵌入法和多相机约束法,本文方法能够大幅提高绝对相位的求解正确率;同时,为了提高算法的运行效率,采用图形处理器并行计算架构对算法进行了优化;该系统成功实现了26frame/s单幅测量点数为94,163的实时动态三维测量。

A novel method combine epipolar constraint to speckle correlation for real-time three-dimensional measurement is presented. Random digital speckle is embedded in the sinusoidal fringe patterns and three-phase-shift is proposed. The period of phase in each pixel is resolved by means of epipolar constraint. Using the theoretical minimum of three images, the phase ambiguity is eliminated and the absolute phase is recovered. Experimental results indicate that the proposed method improves the accuracy of the phase unwrapping immensely compared with the traditional information-embedded and multi-camera constraint methods. In order to improve the operation efficiency of the algorithm, the graphics processing unit parallel computation based on parallel computing architecture is introduced to optimize the algorithm. And the system achieves real-time three-dimensional measurement at average speed of 26 frame/s with a resolution of 94,163 points per frame.