文中用逼近法和双线性变换法，设计了用于圆度测量的高斯数字逼近滤波器，并给出了零相移的递归滤波算法，计算量小，计算效率高，易于实现。
A series of Gaussian digital approximation filters used in roundness measurement were designed on the basis of approximation method and bilinear transformation.
本文介绍零相移滤波器的工作原理及实现方法。
This paper introduce the principle and design of an zero-phase filter.
相移法需要精密的移相装置，且需采集一幅以上的图像，在应用中受到一定限制。
Phase-shifting requires a precise Phase-shifting set and more than one image collected, therefore its application is limited.
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