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122 lines
5.6 KiB
Matlab
122 lines
5.6 KiB
Matlab
% filt2d_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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% Code based in fract_hanning_pad
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%*-----------------------------------------------------------------------*
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%| |
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%| Except where otherwise noted, this work is licensed under a |
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%| Creative Commons Attribution-NonCommercial-ShareAlike 4.0 |
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%| International (CC BY-NC-SA 4.0) license. |
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%| |
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%| Copyright (c) 2017 by Paul Scherrer Institute (http://www.psi.ch) |
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%| |
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%| Author: CXS group, PSI |
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%*-----------------------------------------------------------------------*
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% You may use this code with the following provisions:
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%
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% If the code is fully or partially redistributed, or rewritten in another
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% computing language this notice should be included in the redistribution.
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%
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% If this code, or subfunctions or parts of it, is used for research in a
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% publication or if it is fully or partially rewritten for another
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% computing language the authors and institution should be acknowledged
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% in written form in the publication: “Data processing was carried out
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% using the “cSAXS matlab package” developed by the CXS group,
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% Paul Scherrer Institut, Switzerland.”
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% Variations on the latter text can be incorporated upon discussion with
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% the CXS group if needed to more specifically reflect the use of the package
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% for the published work.
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%
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% A publication that focuses on describing features, or parameters, that
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% are already existing in the code should be first discussed with the
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% authors.
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%
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% This code and subroutines are part of a continuous development, they
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% are provided “as they are” without guarantees or liability on part
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% of PSI or the authors. It is the user responsibility to ensure its
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% proper use and the correctness of the results.
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% License for fract_hanning_pad:
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% Manuel Guizar - 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 = filt2d_pad(outputdim,filterdim,unmodsize, varargin)
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import utils.filt2d
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if nargin == 1
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unmodsize = 0;
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filterdim = outputdim;
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end
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if any(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 any(outputdim < filterdim)
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error('Filter cannot be larger than output size'),
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end
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if any(unmodsize<0)
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unmodsize = [0 0];
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warning('Specified unmodsize<0, setting unmodsize = 0')
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end
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if length(outputdim)<2
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outputdim = [outputdim outputdim];
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elseif length(outputdim)>2
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error('3D filters are not supported.')
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end
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if length(unmodsize)<2
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unmodsize = [unmodsize unmodsize];
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elseif length(unmodsize)>2
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error('3D filters are not supported.')
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end
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if length(filterdim)<2
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filterdim = [filterdim filterdim];
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elseif length(filterdim)>2
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error('3D filters are not supported.')
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end
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out = zeros(outputdim);
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out(round(outputdim(1)/2+1-filterdim(1)/2):round(outputdim(1)/2+1+filterdim(1)/2-1),...
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round(outputdim(2)/2+1-filterdim(2)/2):round(outputdim(2)/2+1+filterdim(2)/2-1)) ...
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= fftshift(filt2d(filterdim,unmodsize,varargin{:}));
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out = fftshift(out);
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return; |