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2026-09-17 20:39:08 +09:00 · 2026-08-07 15:56:42 +09:00
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+% INTERPOLATE_LINEAR rescaling based on interp2, faster than utils.interpolateFT,
+% works also with GPU 
+% Note: for small arrays processed on GPU, utils.interpolateFT can be
+% faster due to lower overhead (no for-loop)
+%
+% img = interpolate_linear(img, scale, method)
+%
+% Inputs:  
+%    **img      -  2D or stack of 2D images 
+%    **scale    - scaling factor 
+%    **method   - linear (default), cubic, nearest
+% *returns*:
+%    ++img_out  - 2D or stack of 2D images scaled by factor scale
+
+%*-----------------------------------------------------------------------*
+%|                                                                       |
+%|  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 = interpolate_linear(img, sizeOut, method)
+
+    [Nx, Ny,Nlayers] = size(img);
+    
+    if all([Nx,Ny] == sizeOut(1:2))
+        img_out = img; 
+        return
+    end
+    
+    if nargin < 3
+        method = 'linear'; 
+    end
+    
+    img_out = zeros([sizeOut(1:2), Nlayers],'like',img);
+    for ii = 1:Nlayers
+        img_out(:,:,ii) = interp2(img(:,:,ii), linspace(1,Ny,sizeOut(2)),linspace(1,Nx,sizeOut(1))', method);
+    end
+   
+end