Cartesian coordinate optical filter analyses [articol]

Abstract

Our goal in this paper is to develop a study about how Cartesian coordinate optical filter acts in frequency. We use coherent illumination and we begin from the amplitude transfer function which is the optical transfer function of filter in this case of illumination. We define different type of filter LPF, HPF and BPF in Cartesian coordinate 2D and 3D then we pass an image trough this filter and we see the filter effect on final image function of filter dimension which we used. For this we use an algorithm in three steps: we compute Fourier transform of an image, then we multiply this with filter transfer function then we make inverse Fourier transform on result.