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2026-09-17 23:59:11 +09:00 · 2026-08-07 15:56:42 +09:00
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+% Vol = local_TV_zsplit(Vol, lambda, eps, Niter, use_chambolle)
+% FUNCTION 
+%    - split volume on smaller blocks for processing by local total variation 
+%    - splitting is done automatically in order to fit to GPU memory 
+% Inputs:
+%     Vol - refined volume 
+%     lambda - refinement step (tunning constant)
+%     eps - regularization term (tunning constant)
+%     Niter - number of iterations 
+%     use_chambolle - if true use Chambolle method, if false use simple gradient descent solver 
+% Recompile: 
+%     mexcuda -output +regularization/private/local_TV_mex +regularization/private/TV_cuda_texture.cu +regularization/private/local_TV_mex.cpp
+
+%*-----------------------------------------------------------------------*
+%|                                                                       |
+%|  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 Vol = local_TV_zsplit(Vol, lambda, eps, Niter, use_chambolle)
+    
+    keep_on_gpu = isa(Vol, 'gpuArray'); 
+
+    gpu = gpuDevice;
+    Nlayers = size(Vol,3); 
+    Nblocks = ceil(numel(Vol)*4 / 1024e6);
+    % empirically tested condition 
+    Nblocks = max(Nblocks, ceil((numel(Vol)*4*14) / gpu.AvailableMemory));
+    Nlayers_on_GPU = ceil(Nlayers/Nblocks); 
+    Nblocks = ceil(Nlayers/Nlayers_on_GPU); 
+    if Nblocks > 1
+        for i = 1:Nblocks
+            utils.progressbar(i, ceil(Nlayers/Nlayers_on_GPU))
+            ind = (1+(i-1)*Nlayers_on_GPU):min(i*Nlayers_on_GPU, Nlayers);
+            Vol_tmp = gpuArray(Vol(:,:,ind));  
+            Vol_tmp = local_TV_mex(Vol_tmp,lambda,eps, Niter, use_chambolle); 
+            if ~keep_on_gpu; Vol_tmp = gather(Vol_tmp);end
+            Vol(:,:,ind) = Vol_tmp;
+        end
+    else
+        Vol = local_TV_mex(Vol,lambda,eps, Niter, use_chambolle); 
+        if ~keep_on_gpu; Vol = gather(Vol);end
+    end
+    
+end