颜色和线强度是可以改变的，由旋转的一个极化滤波器，所以谨慎忠告时，“读出”了观众。
Color and line intensity can be changed by rotating one of the polarized filters, so caution is advised when "reading" the viewer.
讨论了用扇形波导作为旋转模式滤波器的基本原理。
The basic principle of a rotating mode filter with fan-shaped waveguide is presented.
用这种滤波器实现了平移、旋转、尺度三重不变光学图像识别，且有较高的信噪比。
By this filter, the shift, scale and rotation invariant optical pattern recognition was realized with a high signal noise ratio of correlation output.
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