?? showfft.m
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% SHOWFFT - Displays amplitude spectrum of an fft.%% Usage: showfft(ft, figNo)%% Arguments: ft - Fourier transform to be displayed% figNo - Optional figure number to display image in.%% The fft is quadrant shifted to place zero frequency at the centre.%% If figNo is omitted a new figure window is created. If figNo is supplied,% and the figure exists, the existing window is reused to display the image,% otherwise a new window is created.% Copyright (c) 1999 Peter Kovesi% School of Computer Science & Software Engineering% The University of Western Australia% http://www.csse.uwa.edu.au/% % Permission is hereby granted, free of charge, to any person obtaining a copy% of this software and associated documentation files (the "Software"), to deal% in the Software without restriction, subject to the following conditions:% % The above copyright notice and this permission notice shall be included in % all copies or substantial portions of the Software.%% The Software is provided "as is", without warranty of any kind.% October 1999% September 2008 Octave compatiblefunction showfft(im, figNo) Octave = exist('OCTAVE_VERSION') ~= 0; % Are we running under Octave? Title = inputname(1); % Get variable name of image data if nargin == 2 figure(figNo); % Reuse or create a figure window with this number else figNo = figure; % Create new figure window end imagesc(fftshift(abs(im))); colormap(gray); title(Title), axis('image') if ~Octave; truesize(figNo) end
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