2.1.2 On the optical transfer function

The term as it appears in Equation 10 (and various others) can be further optimised if a theoretical OTF is used. An experimentally obtained OTF requires its Fourier transform to be calculated in order for it to be convoluted with the smoothing function ⁴, this requires both memory and time. However, if a theoretical equation is obtained for , then the entire term may be evaluated theoretically. This will give an equation that can be used in the algorithm, in order to deconvolute Equation 10. Thus, a substantial amount of time and memory can be saved by using a theoretically computed OTF. Refer to Section 2.2 for details of what OTF was used.