此方法减小了相位离散值引起的量子化噪音，它适用于制作一切球面和非球面的具有旋转轴对称的相息图。
The method reduces the noise caused by discrete phase on reconstructing imago. This method can apply to either spherical or aspherical kind of Kinoform with axial rotating symmetry.
空间上采用有限元线法进行半离散化，采用已有的轴对称单元、平面单元；
Using Finite Element Method of Lines smash the area in semidiscretization with plane or axial symmetry element which is develop by the postgraduate last session;
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