在数字散斑干涉测量中，对于给定尺寸的CCD，很难在不影响形变测量横向分辨率的情况下扩大视野。针对该问题，提出了一种在不影响横向分辨率的情况下拼接多个子图像相位以扩大视野的方法。设计并搭建了一套多CCD实验装置来获取多个子图像。利用重叠区域解包裹后的相位图估计相邻子图像之间的相对位置并补偿相位偏差，实现正确的相位拼接。为了使用尽可能少的CCD获得尽可能大的视野，分析了重叠区域大小对拼接效果的影响。权衡视野和精度，重叠区域的最佳尺寸约为10%。所提方法在只使用两个CCD的条件下实现了视野从5.5 cm×4 cm扩大到10 cm×4 cm。拼接前后重叠区域的最大相对误差小于1%，证明了该方法的有效性。此外，还比较了所提方法与单CCD的形变测量均方根误差（RMSE）。结果表明，提出的方法具有与单CCD形变测量接近的测量精度。

Aperture synthesis is an important approach to improve the lateral resolution of digital holography (DH) techniques. The limitation of the accuracy of registration positions between sub-holograms affects the quality of the synthesized image and even causes the failure of aperture synthesis. It is a major issue in aperture synthesis of DH. Currently intensity images are utilized to find the registration positions of sub-holograms in aperture synthesis. To improve the accuracy of registration positions, we proposed a method based on similarity calculations of the phase images between sub-holograms instead of intensity images. Furthermore, a quantitative indicator, degree of image distortion, was applied to evaluate the synthetic results. Experiments are performed and the results verify that the proposed phase-image-based method is better than the state-of-the-art intensity-image-based techniques in the estimation of registration positions and provides a better synthesized final three-dimensional shape image.

Digital speckle pattern interferometry (DSPI) is a high-precision deformation measurement technique for planar objects. However, for curved objects, the three-dimensional (3D) shape information is needed in order to obtain correct deformation measurement in DSPI. Thus, combined shape and deformation measurement techniques of DSPI have been proposed. However, the current techniques are either complex in setup or complicated in operation. Furthermore, the operations of some techniques are too slow for real-time measurement. In this work, we propose a DSPI technique for both 3D shape and out-of-plane deformation measurement. Compared with current techniques, the proposed technique is simple in both setup and operation and is capable of fast deformation measurement. Theoretical analysis and experiments are performed. For a cylinder surface with an arch height of 9 mm, the error of out-of-plane deformation measurement is less than 0.15 μm. The effectiveness of the proposed scheme is verified.