计算全息和光学全息都可应用于三维显示，但各有自己的优势和缺陷.将计算全息和光学反射全息相结合，可以突破光学全息对记录物体的限制，进行虚拟物体或自然场景的全息图的制作，同时可以实现白光再现.本文首先用三维扫描仪获得实际物体的三维数据，用“点云算法”模拟得到其菲涅耳全息图透射率数据，采用计算全息打印机将其输出于全息记录介质，得到可光学再现的菲涅耳计算全息图H1.然后将H1作为光学全息的记录物体进行反射全息记录，将平面全息转化为体全息，实现了计算全息白光再现.

Both of the computergenerated holograms and optical holograms can be applied to a threedimensional display, but each has its own advantages and shortcomings. A novel technique is proposed based on the combination of computergenerated holography and reflection holography, which can overcome the limitation of optical holography. This technique can record realexisting objects and virtual objects, and achieve the reconstruction image by white light illumination. A 3D scanner is used to obtain 3D data of a realexisting object and calculate Fresnel holographic transmission distribution by point cloud algorithm. The Fresnel hologram is outputted by a holographic microfilming system. And, the reconstructed real image H1 of the computing hologram is used as the recording object for optical reflection hologram. The principle of this technique is explained in detail and the experimental results demonstrate that the technique is feasible.