Automatic wavefront reconstruction on single interferogram with spatial carrier frequency using Fourier transform

Optical interferometry can be applied to obtain the wavefront phase and reconstruct the three-dimensional wavefront by analyzing interference fringes. Single interferogram analysis based on two-dimensional Fourier transform is proposed. This method just needs to acquire and analyze single interferogram to solve the wavefront phase. Compared with phase-shift method, Single interferogram analysis can reduce experiment cost and the limitation of measuring e nvironment like vibration, airflow and noise, and meet the requirement of real-time and dynamic interferometry. Because the wavefront phase information is included in the carrier frequency components of single interferogram, an image edge detection method is used to automatically extract the center and boundary of the first-order carrier component of the spatial spectrum of the interferogram in the frequency domain.     

基于单目图像序列的铸件三维重建方法

为了实现基于机器视觉的铸件毛刺自动检测与识别,提出了一种基于单目视觉的铸件三维重建方法。利用单目相机对目标进行无标定多角度旋转拍摄,获得一组单目图像序列;运用“两步匹配法”优化相邻图像特征点的匹配,剔除大量误匹配点,提高特征点匹配效率。对三维重建的点阵进行泊松表面重建,细化了铸件三维表面的细节。实验结果表明,该方法装置简单,无需对相机与目标的相对位置进行预先标定,能有效地恢复铸件三维表面的细节特征。该方法适用于机械加工环境下零件的三维表面重建。