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