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authorDaniel M. Pelt <D.M.Pelt@cwi.nl>2015-02-24 12:35:45 +0100
committerDaniel M. Pelt <D.M.Pelt@cwi.nl>2015-02-24 12:35:45 +0100
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-% -----------------------------------------------------------------------
-% This file is part of the ASTRA Toolbox
-%
-% Copyright: 2010-2015, iMinds-Vision Lab, University of Antwerp
-% 2014-2015, CWI, Amsterdam
-% License: Open Source under GPLv3
-% Contact: astra@uantwerpen.be
-% Website: http://sf.net/projects/astra-toolbox
-% -----------------------------------------------------------------------
-
-
-% This example demonstrates using the FP and BP primitives with Matlab's lsqr
-% solver. Calls to FP (astra_create_sino_cuda) and
-% BP (astra_create_backprojection_cuda) are wrapped in a function astra_wrap,
-% and a handle to this function is passed to lsqr.
-
-% Because in this case the inputs/outputs of FP and BP have to be vectors
-% instead of images (matrices), the calls require reshaping to and from vectors.
-
-function s015_fp_bp
-
-
-% FP/BP wrapper function
-function Y = astra_wrap(X,T)
- if strcmp(T, 'notransp')
- % X is passed as a vector. Reshape it into an image.
- [sid, s] = astra_create_sino_cuda(reshape(X,[vol_geom.GridRowCount vol_geom.GridColCount])', proj_geom, vol_geom);
- astra_mex_data2d('delete', sid);
- % now s is the sinogram. Reshape it back into a vector
- Y = reshape(s',[prod(size(s)) 1]);
- else
- % X is passed as a vector. Reshape it into a sinogram.
- v = astra_create_backprojection_cuda(reshape(X, [proj_geom.DetectorCount size(proj_geom.ProjectionAngles,2)])', proj_geom, vol_geom);
- % now v is the resulting volume. Reshape it back into a vector
- Y = reshape(v',[prod(size(v)) 1]);
- end
-end
-
-
-vol_geom = astra_create_vol_geom(256, 256);
-proj_geom = astra_create_proj_geom('parallel', 1.0, 384, linspace2(0,pi,180));
-
-% Create a 256x256 phantom image using matlab's built-in phantom() function
-P = phantom(256);
-
-% Create a sinogram using the GPU.
-[sinogram_id, sinogram] = astra_create_sino_gpu(P, proj_geom, vol_geom);
-
-% Reshape the sinogram into a vector
-b = reshape(sinogram',[prod(size(sinogram)) 1]);
-
-% Call Matlab's lsqr with ASTRA FP and BP
-Y = lsqr(@astra_wrap,b,1e-4,25);
-
-% Reshape the result into an image
-Y = reshape(Y,[vol_geom.GridRowCount vol_geom.GridColCount])';
-imshow(Y,[]);
-
-
-astra_mex_data2d('delete', sinogram_id);
-
-end