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https://github.com/c-sooyoung/fold_slice.git
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85 lines
3.2 KiB
Matlab
85 lines
3.2 KiB
Matlab
% out = shiftwraplinear(in,dy,dx)
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% Shifts an image with wrap around and bilinear interpolation
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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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function out = shiftwrapbilinear(in,dy,dx)
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% in = flipud(im2double(imread('cameraman.tif')));
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% in = in(1,:);
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% %in = in*0;
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% %in(100,50) = 1;
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% dy = -12;
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% dx = -500;
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[ny nx] = size(in);
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dyfloor = floor(dy);
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dxfloor = floor(dx);
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x = [1:nx]+dxfloor;
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y = [1:ny]+dyfloor;
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% Shift integer step (floor of desired)
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y = mod(y-1,ny)+1;
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x = mod(x-1,nx)+1;
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out = in(y,x);
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% Subpixel (bilinear)
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taux = dx-dxfloor;
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tauy = dy-dyfloor;
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if (taux~=0)||(tauy~=0)
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indx = [1:nx];
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indxp1 = [2:nx 1];
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indy = [1:ny];
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indyp1 = [2:ny 1];
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out = out(indy,indx)*(1-tauy)*(1-taux) + ...
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out(indyp1,indx)*tauy*(1-taux) + ...
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out(indy,indxp1)*(1-tauy)*taux + ...
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out(indyp1,indxp1)*tauy*taux;
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end
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% figure(100);
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% imagesc(out);
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% axis xy equal tight;
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% colorbar
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% figure(101);
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% imagesc(real(shiftpp2(in,dy,dx)));
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% axis xy equal tight;
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% colormap gray
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% colorbar |