合成全息图利用多视差图像实现立体显示，并可通过分区曝光实现大面积制作。介绍了数字合成全息的原理及其实验系统，针对其制作过程中的两种图像采样方式，研究了图像的分割和重组原则。通过对单元全息图合成拍摄中图像重叠投影的分析，基于非成像光学理论设计制作了能实现这一功能的透镜，并借助光学软件对其进行了仿真。最后利用所设计的透镜进行了合成全息实验，结果表明，利用所设计的重叠投影透镜和适当的图像处理方法，能合成出轮廓清晰、立体感强的全息立体图。

Synthetic holography takes advantage of multi-parallax images to realize stereo display, and it can produce large area image through partition exposure. We describe the theory and system of digital synthetic holography and discuss the principle of the image division and recombination for two sampling modes. After analyzing the overlapped projection of the recombination image during the unit holograms exposure, we design an overlapped projecting lens based on nonimaging optics theory. The lens is simulated through optical design software. Finally we perform synthetic holography experiments with the lens. The results show that using the overlapped projecting lens and an appropriate image processing method, a clear-cut holographic stereogram with a strong three-dimensional sense can be obtained.