To those like me who are not into photography, this is equivalent to multiplying by a sinc or gaussian before a Fourier transform, to avoid artifacts caused by

To those like me who are not into photography, this is equivalent to multiplying by a sinc or gaussian before a Fourier transform, to avoid artifacts caused by sharp windows. https://en.wikipedia.org/wiki/Apodization https://en.wikipedia.org/wiki/Apodization