The Fourier transform power spectrum of input object can be obtained when the input image is placed at the front or back of the hololens.
将输入图像置于这种全息透镜的前面或后面，均能得到物体的傅里叶变换功率谱。
2
The OTF (Optical Transfer Function) of an optical system can be evaluated by the Fourier Transform of the first derivative of the optical image of an knife-edge (object).
对光学系统输出刀口像的一阶导数做傅里叶变换，可以得到该系统的光学传递函数（OTF）。
3
The method defines different member function for the object and background of the image to transform the image into fuzzy domain with maximum fuzzy entropy.