FAST FRENEL TRANSFORMATION IN MATLAB
This article shows the algorithm of fast Fresnel transform, based on reducing the number of decompositions of elements of the transformation kernel. In the algorithm, the repetitive elements of the kernel with symmetric indices are remembered and substituted in the form of prepared complex numbers. The symmetry of the Fresnel transform kernel along the horizontal and vertical axes allows to reduce the number of steps by 4 times, which speeds up the process of calculating the Fresnel transform by about the same amount.