在分析电子全息图特性的基础上 ,提出频谱滤波法对电子全息图进行数字再现 ,以解决其再现像之间相互重叠的问题。此方法首先将数字化的电子全息图进行傅里叶变换得到全息图的空间频谱 ,然后对此频谱进行滤波处理并作反傅里叶变换得到一幅新的全息图 ,最后再用一般的数字再现法对此新的全息图进行再现。用这种方法 ,可以很方便地得到不受干扰的再现实像。 Based on the analysis of the characteristics of electronic holograms, the spectral filtering method is proposed to digitally reproduce the electronic holograms to solve the problem that the reconstructed images overlap each other. In this method, the digitalized electronic hologram is first Fourier transformed to obtain the spatial spectrum of the hologram, and then the spectrum is filtered and processed to obtain a new hologram by inverse Fourier transform. Finally, the digital image is reconstructed by a general digital method Law to reproduce this new hologram. In this way, it is easy to get the real image without interference.