Kevin Cowtan's Book of Fourier
This is a book of pictorial 2-d Fourier Transforms. These are
particularly relevant to my own field of x-ray crystallography, but
may also be of interest to anyone involved in signal processing or
frequency domain calculations.
I have adopted a colourful scheme for representing complex numbers on
the two-dimensional images. Amplitude is represented by colour
saturation and brightness, while phase is given by
hue. This is illustrated in the following figure:
Note that positive real numbers are red, and negative real
numbers are cyan.
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Kevin Cowtan: email@example.com