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+utils/imshift_circ_ax.m

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+% IMSHIFT_CIRC_AX  will apply integer shift that can be different
+%     for each frame along axis AX. The shift is applied with !! periodic
+%     boundary !!. 
+% 
+%  img_out = imshift_circ_ax(img, shift, ax)
+% 
+% Inputs: 
+%   **img       - stack of images 
+%   **shift     - horizontal / vertical shift in pixels , N*2 vector 
+%   **ax        - axis along which the stacked images will be shifted 
+% *returns*: 
+%   ++img       - shifted image 
+
+
+%*-----------------------------------------------------------------------*
+%|                                                                       |
+%|  Except where otherwise noted, this work is licensed under a          |
+%|  Creative Commons Attribution-NonCommercial-ShareAlike 4.0            |
+%|  International (CC BY-NC-SA 4.0) license.                             |
+%|                                                                       |
+%|  Copyright (c) 2017 by Paul Scherrer Institute (http://www.psi.ch)    |
+%|                                                                       |
+%|       Author: CXS group, PSI                                          |
+%*-----------------------------------------------------------------------*
+% You may use this code with the following provisions:
+%
+% If the code is fully or partially redistributed, or rewritten in another
+%   computing language this notice should be included in the redistribution.
+%
+% If this code, or subfunctions or parts of it, is used for research in a 
+%   publication or if it is fully or partially rewritten for another 
+%   computing language the authors and institution should be acknowledged 
+%   in written form in the publication: “Data processing was carried out 
+%   using the “cSAXS matlab package” developed by the CXS group,
+%   Paul Scherrer Institut, Switzerland.” 
+%   Variations on the latter text can be incorporated upon discussion with 
+%   the CXS group if needed to more specifically reflect the use of the package 
+%   for the published work.
+%
+% A publication that focuses on describing features, or parameters, that
+%    are already existing in the code should be first discussed with the
+%    authors.
+%   
+% This code and subroutines are part of a continuous development, they 
+%    are provided “as they are” without guarantees or liability on part
+%    of PSI or the authors. It is the user responsibility to ensure its 
+%    proper use and the correctness of the results.
+
+
+function img_out = imshift_circ_ax(img, shift, ax)
+
+    shift = round(shift); 
+    
+    if all(shift == 0)
+        img_out=img;
+        return
+    end
+        
+    Npix = size(img);
+    
+    img_out = img; 
+         
+    
+    ind = {':',':',':'}; % assume max 3 dim 
+    ax_0 = 1+mod(ax,ndims(img)); % fixed axis 
+    for i = 1:Npix(ax_0)
+        ind{ax_0} = i;      
+        img_out(ind{:}) = circshift(img(ind{:}), shift(i), ax);
+    end
+    
+
+end
+