diff options
| -rw-r--r-- | matlab/tools/opTomo.m | 280 | ||||
| -rw-r--r-- | matlab/tools/opTomo_helper_handle.m | 29 | ||||
| -rw-r--r-- | samples/matlab/s017_opTomo.m | 62 |
3 files changed, 371 insertions, 0 deletions
diff --git a/matlab/tools/opTomo.m b/matlab/tools/opTomo.m new file mode 100644 index 0000000..14128d2 --- /dev/null +++ b/matlab/tools/opTomo.m @@ -0,0 +1,280 @@ +%OPTOMO Wrapper for ASTRA tomography projector +% +% OP = OPTOMO(TYPE, PROJ_GEOM, VOL_GEOM) generates a Spot operator OP for +% the ASTRA forward and backprojection operations. The string TYPE +% determines the model used for the projections. Possible choices are: +% TYPE: * using the CPU +% 'line' - use a line kernel +% 'linear' - use a Joseph kernel +% 'strip' - use the strip kernel +% * using the GPU +% 'cuda' - use a Joseph kernel, on the GPU, currently using +% 'cuda' is the only option in 3D. +% The PROJ_GEOM and VOL_GEOM structures are projection and volume +% geometries as used in the ASTRA toolbox. +% +% OP = OPTOMO(TYPE, PROJ_GEOM, VOL_GEOM, GPU_INDEX) also specify the +% index of the GPU that should be used, if multiple GPUs are present in +% the host system. By default GPU_INDEX is 0. +% +% Note: this code depends on the Matlab toolbox +% "Spot - A Linear-Operator Toolbox" which can be downloaded from +% http://www.cs.ubc.ca/labs/scl/spot/ +%-------------------------------------------------------------------------- +% This file is part of the ASTRA Toolbox +% +% Copyright: 2014-2015, CWI, Amsterdam +% License: Open Source under GPLv3 +% Author: Folkert Bleichrodt +% Contact: F.Bleichrodt@cwi.nl +% Website: http://sf.net/projects/astra-toolbox +%-------------------------------------------------------------------------- +% $Id$ + +classdef opTomo < opSpot + + %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + % Properties + %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + properties ( Access = private ) + % multiplication function + funHandle + % ASTRA identifiers + sino_id + vol_id + fp_alg_id + bp_alg_id + % ASTRA IDs handle + astra_handle + % geometries + proj_geom; + vol_geom; + end % properties + + properties ( SetAccess = private, GetAccess = public ) + proj_size + vol_size + end % properties + + %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + % Methods - public + %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + methods + + %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + % opTomo - constructor + %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + function op = opTomo(type, proj_geom, vol_geom, gpu_index) + + if nargin < 4 || isempty(gpu_index), gpu_index = 0; end + + proj_size = astra_geom_size(proj_geom); + vol_size = astra_geom_size(vol_geom); + + % construct operator + op = op@opSpot('opTomo', prod(proj_size), prod(vol_size)); + + % determine the dimension + is2D = ~isfield(vol_geom, 'GridSliceCount'); + gpuEnabled = strcmpi(type, 'cuda'); + + if is2D + % create a projector + proj_id = astra_create_projector(type, proj_geom, vol_geom); + + % create a function handle + op.funHandle = @opTomo_intrnl2D; + + % Initialize ASTRA data objects. + % projection data + sino_id = astra_mex_data2d('create', '-sino', proj_geom, 0); + % image data + vol_id = astra_mex_data2d('create', '-vol', vol_geom, 0); + + % Setup forward and back projection algorithms. + if gpuEnabled + fp_alg = 'FP_CUDA'; + bp_alg = 'BP_CUDA'; + proj_id = []; + else + fp_alg = 'FP'; + bp_alg = 'BP'; + proj_id = astra_create_projector(type, proj_geom, vol_geom); + end + + % configuration for ASTRA fp algorithm + cfg_fp = astra_struct(fp_alg); + cfg_fp.ProjectorId = proj_id; + cfg_fp.ProjectionDataId = sino_id; + cfg_fp.VolumeDataId = vol_id; + + % configuration for ASTRA bp algorithm + cfg_bp = astra_struct(bp_alg); + cfg_bp.ProjectionDataId = sino_id; + cfg_bp.ProjectorId = proj_id; + cfg_bp.ReconstructionDataId = vol_id; + + % set GPU index + if gpuEnabled + cfg_fp.option.GPUindex = gpu_index; + cfg_bp.option.GPUindex = gpu_index; + end + + fp_alg_id = astra_mex_algorithm('create', cfg_fp); + bp_alg_id = astra_mex_algorithm('create', cfg_bp); + + % Create handle to ASTRA objects, so they will be deleted + % if opTomo is deleted. + op.astra_handle = opTomo_helper_handle([sino_id, ... + vol_id, proj_id, fp_alg_id, bp_alg_id]); + + op.fp_alg_id = fp_alg_id; + op.bp_alg_id = bp_alg_id; + op.sino_id = sino_id; + op.vol_id = vol_id; + else + % 3D + % only gpu/cuda code for 3D + if ~gpuEnabled + error(['Only type ' 39 'cuda' 39 ' is supported ' ... + 'for 3D geometries.']) + end + + % create a function handle + op.funHandle = @opTomo_intrnl3D; + end + + + % pass object properties + op.proj_size = proj_size; + op.vol_size = vol_size; + op.proj_geom = proj_geom; + op.vol_geom = vol_geom; + op.cflag = false; + op.sweepflag = false; + + end % opTomo - constructor + + end % methods - public + + %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + % Methods - protected + %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + methods( Access = protected ) + + % multiplication + function y = multiply(op,x,mode) + + % ASTRA cannot handle sparse vectors + if issparse(x) + x = full(x); + end + + % convert input to single + if isa(x, 'single') == false + x = single(x); + end + + % the multiplication + y = op.funHandle(op, x, mode); + + % make sure output is column vector + y = y(:); + + end % multiply + + end % methods - protected + + %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + % Methods - private + %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + methods( Access = private ) + + % 2D projection code + function y = opTomo_intrnl2D(op,x,mode) + + if mode == 1 + % X is passed as a vector, reshape it into an image. + x = reshape(x, op.vol_size); + + % Matlab data copied to ASTRA data + astra_mex_data2d('store', op.vol_id, x); + + % forward projection + astra_mex_algorithm('iterate', op.fp_alg_id); + + % retrieve Matlab array + y = astra_mex_data2d('get_single', op.sino_id); + else + % X is passed as a vector, reshape it into a sinogram. + x = reshape(x, op.proj_size); + + % Matlab data copied to ASTRA data + astra_mex_data2d('store', op.sino_id, x); + + % backprojection + astra_mex_algorithm('iterate', op.bp_alg_id); + + % retrieve Matlab array + y = astra_mex_data2d('get_single', op.vol_id); + end + end % opTomo_intrnl2D + + + % 3D projection code + function y = opTomo_intrnl3D(op,x,mode) + + if mode == 1 + % X is passed as a vector, reshape it into an image + x = reshape(x, op.vol_size); + + % initialize output + y = zeros(op.proj_size, 'single'); + + % link matlab array to ASTRA + vol_id = astra_mex_data3d_c('link', '-vol', op.vol_geom, x, 0); + sino_id = astra_mex_data3d_c('link', '-sino', op.proj_geom, y, 1); + + % initialize fp algorithm + cfg = astra_struct('FP3D_CUDA'); + cfg.ProjectionDataId = sino_id; + cfg.VolumeDataId = vol_id; + + alg_id = astra_mex_algorithm('create', cfg); + + % forward projection + astra_mex_algorithm('iterate', alg_id); + + % cleanup + astra_mex_data3d('delete', vol_id); + astra_mex_data3d('delete', sino_id); + else + % X is passed as a vector, reshape it into projection data + x = reshape(x, op.proj_size); + + % initialize output + y = zeros(op.vol_size,'single'); + + % link matlab array to ASTRA + vol_id = astra_mex_data3d_c('link', '-vol', op.vol_geom, y, 1); + sino_id = astra_mex_data3d_c('link', '-sino', op.proj_geom, x, 0); + + % initialize bp algorithm + cfg = astra_struct('BP3D_CUDA'); + cfg.ProjectionDataId = sino_id; + cfg.ReconstructionDataId = vol_id; + + alg_id = astra_mex_algorithm('create', cfg); + + % backprojection + astra_mex_algorithm('iterate', alg_id); + + % cleanup + astra_mex_data3d('delete', vol_id); + astra_mex_data3d('delete', sino_id); + end + end % opTomo_intrnl3D + + end % methods - private + +end % classdef diff --git a/matlab/tools/opTomo_helper_handle.m b/matlab/tools/opTomo_helper_handle.m new file mode 100644 index 0000000..d9be51f --- /dev/null +++ b/matlab/tools/opTomo_helper_handle.m @@ -0,0 +1,29 @@ +classdef opTomo_helper_handle < handle + %ASTRA.OPTOMO_HELPER_HANDLE Handle class around an astra identifier + % Automatically deletes the data when object is deleted. + % Multiple id's can be passed as an array as input to + % the constructor. + + properties + id + end + + methods + function obj = opTomo_helper_handle(id) + obj.id = id; + end + function delete(obj) + for i = 1:numel(obj.id) + % delete any kind of object + astra_mex_data2d('delete', obj.id(i)); + astra_mex_data3d('delete', obj.id(i)); + astra_mex_algorithm('delete', obj.id(i)); + astra_mex_matrix('delete', obj.id(i)); + astra_mex_projector('delete', obj.id(i)); + astra_mex_projector3d('delete', obj.id(i)) + end + end + end + +end + diff --git a/samples/matlab/s017_opTomo.m b/samples/matlab/s017_opTomo.m new file mode 100644 index 0000000..891a93d --- /dev/null +++ b/samples/matlab/s017_opTomo.m @@ -0,0 +1,62 @@ +% ----------------------------------------------------------------------- +% 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 sample illustrates the use of opTomo. +% +% opTomo is a wrapper around the FP and BP operations of the ASTRA Toolbox, +% to allow you to use them as you would a matrix. +% +% This class requires the Spot Linear-Operator Toolbox to be installed. +% You can download this at http://www.cs.ubc.ca/labs/scl/spot/ + +% load a phantom image +im = phantom(256); +% and flatten it to a vector +x = im(:); + +%% Setting up the geometry +% projection geometry +proj_geom = astra_create_proj_geom('parallel', 1, 256, linspace2(0,pi,180)); +% object dimensions +vol_geom = astra_create_vol_geom(256,256); + +%% Generate projection data +% Create the Spot operator for ASTRA using the GPU. +W = opTomo('cuda', proj_geom, vol_geom); + +p = W*x; + +% reshape the vector into a sinogram +sinogram = reshape(p, W.proj_size); +imshow(sinogram, []); + + +%% Reconstruction +% We use a least squares solver lsqr from Matlab to solve the +% equation W*x = p. +% Max number of iterations is 100, convergence tolerance of 1e-6. +y = lsqr(W, p, 1e-6, 100); + +% the output is a vector, so we reshape it into an image +reconstruction = reshape(y, W.vol_size); + +subplot(1,3,1); +imshow(reconstruction, []); +title('Reconstruction'); + +subplot(1,3,2); +imshow(im, []); +title('Ground truth'); + +% The transpose of the operator corresponds to the backprojection. +backProjection = W'*p; +subplot(1,3,3); +imshow(reshape(backProjection, W.vol_size), []); +title('Backprojection'); |