On Fri, Feb 01, 2019 at 01:54:41PM -0600, Robert R Chrostowski wrote: > I would like to know what function Gwyddion uses for its Hann > windowing in the 2D PSDF dialog. The documentation only covers the 1D > windowing functions, and I couldn't find anything from a cursory > search of the forum and the mailing list archive. Visually the > resultant PSDF looks appropriately radially symmetric, but I'd like > some confirmation and I also need to know how the window is > normalized.
All 2D windows in Gwyddion are Cartesian products of 1D windows. So essentially rows and column are independently windowed by the 1D window. By default the window is unnormalised; for Hann it means its maximum value is 1. FFT functions offer ‘Preserver rms’ option which normalises the data after windowing, ensuring windowing is unitary. PSDF calculations and similar functions do this implicitly. Regards, Yeti _______________________________________________ Gwyddion-users mailing list Gwyddion-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/gwyddion-users
