数字全息亚像素位移综合孔径方法

孔径综合是提高成像分辨率的有效手段。针对综合孔径数字全息术，提出一种亚像素位移精度的孔径综合方法。利用基于快速傅里叶变换的菲涅耳衍射公式进行目标光场重构，利用傅里叶变换的移位性质，将全息图的位移量转化为活塞相位和倾斜相位，从而实现任意位移量的数字全息孔径综合。开展了数字离轴全息综合孔径实验，实验结果验证了该方法的有效性。同时，在牺牲一定分辨率的前提下，该方法能够显著减少孔径综合的运算量，具有很好的实时性，并降低处理器的硬件配置要求。

Digital holography subpixel displacement aperture synthesis

Aperture synthesis is an effective means to improve the image resolution. For synthetic-aperture digital holography, an aperture synthesis method on sub-pixel displacement accuracy was proposed. The optical field was reconstructed by Fresnel diffraction formula based on fast Fourier transformation, and the displacement of hologram was transformed into piston phase and tilt phase by using the shift property of Fourier transformation, so that the digital holographic aperture synthesis with arbitrary displacement was realized. A digital off-axis holographic aperture synthesis experiment was carried out, and the experimental results verify the effectiveness of the proposed method. Furthermore, the method can effectively reduce the computational complexity under the premise of sacrificing a certain resolution, and has good real-time performance, and reduces the hardware configuration requirements of the processor.