rename psd.m to powerSpectralDensity.m

avoids shadowing MATLABs builtin function psd

fix #2

functions/imageProcessing/analysis/psd.m → functions/imageProcessing/analysis/powerSpectralDensity.m

-function psdVals = psd(array, betaWindow)
-% PSD computes the power-spectral-density (PSD) of a given array.
+function psdVals = powerSpectralDensity(array, betaWindow)
+% POWERSPECTRALDENSITY computes the power-spectral-density (PSD) of a given array.
 %
-%    ``psdVals = psd(array, beta_window)``
+%    ``psdVals = powerSpectralDensity(array, beta_window)``
 %
 % Note that prior to the Fourier transform, the array is weighted with a Kaiser-Bessel window
 % in order to avoid truncation errors.
@@ -30,7 +30,7 @@ function psdVals = psd(array, betaWindow)
 %     im = fspecial('disk', r_disk);
 %     im = padarray(padarray(im, ceil((N-size(im))/2), 0, 'pre'), floor((N-size(im))/2), 0, 'post');
 %     figure('name', 'image'); showImage(im)
-%     figure('name', 'Log(PSD(image))'); showImage(log(psd(im)))
+%     figure('name', 'Log(PSD(image))'); showImage(log(powerSpectralDensity(im)))
 
 % HoloTomoToolbox
 % Copyright (C) 2019  Institut fuer Roentgenphysik, Universitaet Goettingen

functions/phaseRetrieval/utilities/checkFresnelNumber.m

@@ -79,7 +79,7 @@ hologram = cropToCenter(hologram, min(size(hologram))*[1,1]);
 hologram = fadeoutImage(hologram);
 
 % Compute angularly averaged, logarithmic power-spectral-density (PSD)
-hologramPSDAngularAvg = angularAverage(psd(double(hologram)));
+hologramPSDAngularAvg = angularAverage(powerSpectralDensity(double(hologram)));
 
 % Fourier-frequencies corresponding to the PSD-values, normalized with Fresnel number
 fourierFreqs = fftfreq(size(hologram,1));