离轴菲涅尔全息图的数字再现

分析了离轴菲涅尔全息网的数字再现过程中照明光的角度参数对再现像质量的影响，提出了通过分析全息图的空间频谱结构自动提取最佳照明光方向参数的方法，进而应用MATLAB实现了数字离轴菲涅尔全息图的自动再现，其中参考光的角度参数是通过分析全息图的空间频谱结构自动提取的，数字再现像面的精确定位则可以通过自动聚焦算法来实现，并利用数字全息记录和再现过程中得到的物距参数准确标定了图像传感器的像素尺寸，给出了有关理论分析及实验结果。

Digital Reconstruction of Off-axis Fresnel Holograms

The influence of illumination parameters on the quality of reconstructed images in digital reconstruction of an off-axis Fresnel hologram is analyzed. A new algorithm is proposed to extract the optimal illuminating orientation according to the spatial spectra of the hologram. And a digital reconstruction program for off-axis Fresnel holograms is designed in MATLAB, in which the optimal illumination beam is obtained automatically by analyzing the spatial spectra of the hologram,and the exact image plane is found by an auto-focusing algorithm. The pixel size of the image sensor can be also calculated by use of the parameters of the object distances measured in recording and reconstructing process at the same time. The theoretical analysis and experimental results are aualysed.