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本文提出在全息图的适当位置记录两个函数卷积的频谱或者记录两线簇相叠产生莫尔条纹的方法．使仿制者难以从频谱或条纹推测具体的光学方法与有关参数，从而达到加密的目的。本文还给出制作的方法及光路．
This paper proposes a method of recording the spectrum of the two function convolutions or recording the moire fringes caused by the overlap of two lines in the proper position of the hologram. So that imitators are difficult to speculate from the spectrum or stripes specific optical methods and related parameters, so as to achieve the purpose of encryption. This article also gives the production method and light path.