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1 line
2.0 KiB
Matlab
1 line
2.0 KiB
Matlab
%function out=shiftpp(in,rows,cols)
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%performs partial-pixel shift (with wraparound) using FFT
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% Modified from shiftpp.m to correct a phase factor that appeared when using
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% odd sized arrays.
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% Manuel Guizar - Dec 13, 2007
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% Copyright (c) 2016, Manuel Guizar Sicairos, James R. Fienup, 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=shiftpp2(in,rows,cols)
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[nr,nc]=size(in);
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Nr = ifftshift([-fix(nr/2):ceil(nr/2)-1]);
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Nc = ifftshift([-fix(nc/2):ceil(nc/2)-1]);
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[Nc,Nr] = meshgrid(Nc,Nr);
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out = ifft2(fft2(in).*exp(i*2*pi*(rows*Nr/nr+cols*Nc/nc)));
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return
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