This menu enables a full resolution FFT of lines or columns (not both simultaneously) to be calculated. The FFT may be of a window or the whole screen. If the number of pixels in the required direction in the window is not equal to 2^n, then the data is padded in an appropriate manner.
This option evaluates the one-dimensional autocorrelation functions for the rows or columns of an image within a window. The autocorrelation function is then displayed graphically with intensity corresponding to correlation.
This option evaluates the one-dimensional power spectra for the rows or columns of an image within a window. The power spectra are then displayed graphically with intensity corresponding to correlation.