摘要
介绍了一种制作真实三维物体计算全息图的新方法。用摄像机记录三维物体在非相干光照明条件下两个正交方向上不同视角的一系列投影像,将这些投影像导入计算机,在MATLAB中对其作快速傅里叶变换。对这一系列二维投影像的傅里叶变换图进行抽样,得到三维物体在透镜后焦平面上的光场分布,进而制成一张计算全息图。结果证明该方法可以实现对真实物体三维全息图的合成,并且在算法实现上更加简单,提高了程序的运行速度,有利于改善全息图再现像的质量。为解决真实物体相干全息记录中光源功率和相干长度对全息记录可行性的限制指出了一个新的方向。
A new method of synthesizing computer generated holograms of real-existing 3-D objects is proposed. A series of projections of the 3-D object from different points of view at two orthogonal directions are recorded by an ordinary digital camera. These recorded data are loaded in a computer and Fast Fourier Transform （FFT） is carried out by MATLAB. These FFT data are sampled. The complex wavefronts of the 3-D object on the later focal plane of a lens are obtained. The generated hologram can be made with the wavefronts. The results show that the 3 D real images of the object can be reconstructed by the method. The method is much simpler. The running speed of the program is increased. The quality of the reconstructed images is improved. And it also indicates a new direction to resolve the limitation of optical source and coherent length to the feasibility of hologram recording while real-existing objects are recorded holographically.
出处
《光学与光电技术》
2007年第6期77-80,共4页
Optics & Optoelectronic Technology
关键词
计算全息图
投影
傅里叶变换
三维显示
computer generated hologram
projection
Fourier transform
3-D display
