改进的枝切法在散斑相位解包裹中的应用

为了实现枝切法在激光散斑干涉相位图解包裹中工程化的应用，解决由于外来光线干扰、激光器性能下降、相机拍照局部点欠采样等原因出现的枝切线密集、计算速度慢等问题，在Goldstein枝切法的基础上提出了优化改进方案。将残差点当作带着正负单位电量的“电子”，利用电磁力导引通过相位平滑或增加相位跳变处理消除残差点，减少枝切线数量，同时采用GPU并行计算技术提高图像处理速度。仿真实验和实际测量数据表明优化后 的枝切法解包裹图像质量更好，对于500万像素散斑相位图，通过电磁力引导可消除98%以上的残差点，减少90%以上的枝切线，处理时间可由以往15 s压缩至1.5 s，满足了枝切法高质量快速解包裹的工程化应用要求。

Application of improved branch-cut method in speckle phase unwrapping

In order to realize the engineering application of the branch-cut method in the phase diagram unwrapping of laser speckle pattern interferometry, and to solve the problems of dense branch lines and slow calculation speed caused by the interference of external light, the degradation of laser performance and the undersampling of local points taken by cameras, an optimization and improvement scheme based on Goldstein branch-cut method was proposed. The residual points were regarded as "electrons" with positive and negative unit electric quantities, guided by electromagnetic force, and eliminated by phase smoothing or increasing phase jump, thus reducing the number of branch lines. At the same time, GPU parallel computing technology was adopted to improve the processing speed of high-resolution and large-size phase diagram. The simulation experiment and actual measurement data show that the unwrapping diagram quality is better by the improved branch-cut method. For the 5 million pixel speckle phase diagram, more than 98% of the residual points can be eliminated by electromagnetic force, and the branch lines can be reduced by more than 90%. The processing time can be reduced from the previous 15 seconds to 1.5 seconds, which meets the engineering application requirements of high quality and quick unwrapping by branch-cut method.