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#-----------------------------------------------------------------------
#Copyright 2013 Centrum Wiskunde & Informatica, Amsterdam
#
#Author: Daniel M. Pelt
#Contact: D.M.Pelt@cwi.nl
#Website: http://dmpelt.github.io/pyastratoolbox/
#
#
#This file is part of the Python interface to the
#All Scale Tomographic Reconstruction Antwerp Toolbox ("ASTRA Toolbox").
#
#The Python interface to the ASTRA Toolbox is free software: you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation, either version 3 of the License, or
#(at your option) any later version.
#
#The Python interface to the ASTRA Toolbox is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
#GNU General Public License for more details.
#
#You should have received a copy of the GNU General Public License
#along with the Python interface to the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
#
#-----------------------------------------------------------------------
import astra
import numpy as np
vol_geom = astra.create_vol_geom(256, 256)
proj_geom = astra.create_proj_geom('parallel', 1.0, 384, np.linspace(0,np.pi,180,False))
# Create volumes
# initialized to zero
v0 = astra.data2d.create('-vol', vol_geom)
# initialized to 3.0
v1 = astra.data2d.create('-vol', vol_geom, 3.0)
# initialized to a matrix. A may be a single, double or logical (0/1) array.
import scipy.io
A = scipy.io.loadmat('phantom.mat')['phantom256']
v2 = astra.data2d.create('-vol', vol_geom, A)
# Projection data
s0 = astra.data2d.create('-sino', proj_geom)
# Initialization to a scalar or a matrix also works, exactly as with a volume.
# Update data
# set to zero
astra.data2d.store(v0, 0)
# set to a matrix
astra.data2d.store(v2, A)
# Retrieve data
R = astra.data2d.get(v2)
import pylab
pylab.gray()
pylab.imshow(R)
pylab.show()
# Free memory
astra.data2d.delete(v0)
astra.data2d.delete(v1)
astra.data2d.delete(v2)
astra.data2d.delete(s0)
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