Building any Diffraction Screens and Simulation of their Fraunhofer Diffractions

According to digital image processing,two methods,linear programming and screen digital image intercepting,are discussed in detail to gain various diffraction screens.The former is only applied to show the diffraction screens of some regular diffraction apertures whose diffraction equations can be exactly deduced by mathematic calculation.The latter can be used to draw the diffraction screens of any irregular and complex obstacle.The Fraunhofer diffraction phenomena of various diffraction screens by Fourier transform method are useful not only to apprehend the principle of diffraction theory but also to develop new applications of diffraction phenomena.