This chapter is devoted to discrete representation of diffraction integrals. It expounds
principles of the discretization and their applications to derivation of different modifications of Discrete
Fourier Transforms, Discrete Fresnel Transforms and Kirchhoff-Rayleigh-Sommerfeld transforms. The
chapter is supplemented with appendices that contain relevant mathematical details, description of the
new algorithm for signal convolution via fast cosine transform and a summary of discrete diffraction
transforms.
