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2026-09-17 22:59:07 +09:00 · 2026-08-07 15:56:42 +09:00
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+% FUNCTION img_stack = imrotate_ax(img_stack, angle, ax, val, method)
+% bilinear rotate stack of images along given axis 
+
+% IMROTATE_AX  bilinear rotate stack of images along given axis 
+% img_stack = imrotate_fft(img, theta, axis,ax=3 val=0, method='bilinear')
+% 
+% Inputs: 
+%   **img   - stacked array of images to be rotated 
+%   **theta - rotation angle 
+%   **axis  - rotation axis 
+% *optional*
+%   **val   - fill missing values by this number 
+%   **method- interpolation method
+% *returns*:
+%   ++img   - rotated 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_stack = imrotate_ax(img_stack, angle, ax, val, method)       
+    if nargin < 4 
+        val = 0; 
+    end
+    if nargin  < 3
+        ax = 3;
+    end
+    if nargin < 5
+        method = 'bilinear'; 
+    end
+
+    %% bilinear rotation along given axis 
+    N = size(img_stack,ax); 
+    
+    if ~isa(img_stack, 'gpuArray')
+        %% for CPU based rotation process the inputs slice by slice 
+        ind = {':',':',':'};
+        for ii = 1:N
+            if utils.verbose > 0; utils.progressbar(ii,N); end
+            ind{ax} = ii; 
+
+                    auxslice = squeeze(img_stack(ind{:}));
+            if any(size(auxslice) ~= N)
+                % pad in case of asymmetric input 
+                auxslice_pad =  padarray( auxslice , [N N], val); % val is the background
+                auxslice_pad = imrotate(auxslice_pad,angle,method,'crop');
+                auxslice = auxslice_pad(N+1:end-N, N+1:end-N);
+            else
+                auxslice = imrotate(auxslice,angle,method,'crop');
+            end
+            img_stack(ind{:}) = auxslice;
+        end
+    else
+        %% for GPU call directly the internal code for 2D interpolation and process the image block in one step 
+        
+        if ax == 1
+           img_stack = permute(img_stack, [3,2,1]); angle = - angle; 
+        elseif ax == 2
+           img_stack = permute(img_stack, [1,3,2]);
+        end
+    
+        outputSize = size(img_stack);
+        if isreal(img_stack)
+            img_stack = images.internal.gpu.imrotate(img_stack, angle, method, outputSize);
+        else
+            img_stack = complex(images.internal.gpu.imrotate(real(img_stack), angle, method, outputSize),...
+                    images.internal.gpu.imrotate(imag(img_stack), angle, method, outputSize));
+        end
+        
+        if ax == 1
+           img_stack = permute(img_stack, [3,2,1]);
+        elseif ax == 2
+           img_stack = permute(img_stack, [1,3,2]);
+        end
+    
+
+    
+end