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70 lines
3.0 KiB
Matlab
70 lines
3.0 KiB
Matlab
% fract_hanning_pad(outputdim,filterdim,unmodsize)
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% out = Square array containing a fractional separable Hanning window with
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% DC in upper left corner.
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% outputdim = size of the output array
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% filterdim = size of filter (it will zero pad if filterdim<outputdim
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% unmodsize = Size of the central array containing no modulation.
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% Creates a square hanning window if unmodsize = 0 (or ommited), otherwise the output array
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% will contain an array of ones in the center and cosine modulation on the
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% edges, the array of ones will have DC in upper left corner.
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% August 17, 2009
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% Copyright (c) 2016, Manuel Guizar Sicairos, University of Rochester
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% All rights reserved.
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%
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% Redistribution and use in source and binary forms, with or without
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% modification, are permitted provided that the following conditions are
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% met:
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%
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% * Redistributions of source code must retain the above copyright
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% notice, this list of conditions and the following disclaimer.
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% * Redistributions in binary form must reproduce the above copyright
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% notice, this list of conditions and the following disclaimer in
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% the documentation and/or other materials provided with the distribution
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% * Neither the name of the University of Rochester nor the names
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% of its contributors may be used to endorse or promote products derived
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% from this software without specific prior written permission.
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%
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% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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% AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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% ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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% LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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% CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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% SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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% INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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% CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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% ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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% POSSIBILITY OF SUCH DAMAGE.
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function out = fract_hanning_pad(outputdim,filterdim,unmodsize);
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import utils.fract_hanning
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if nargin > 3,
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error('Too many input arguments'),
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elseif nargin == 1,
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unmodsize = 0;
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filterdim = outputdim;
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end
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if outputdim < unmodsize,
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error('Output dimension must be smaller or equal to size of unmodulated window'),
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end
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if outputdim < filterdim,
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error('Filter cannot be larger than output size'),
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end
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if unmodsize<0,
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unmodsize = 0;
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warning('Specified unmodsize<0, setting unmodsize = 0')
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end
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out = zeros(outputdim);
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out(round(outputdim/2+1-filterdim/2):round(outputdim/2+1+filterdim/2-1),...
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round(outputdim/2+1-filterdim/2):round(outputdim/2+1+filterdim/2-1)) ...
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= fftshift(fract_hanning(filterdim,unmodsize));
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out = fftshift(out);
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return; |