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# -*- coding: utf-8 -*-
# This work is independent part of the Core Imaging Library developed by
# Visual Analytics and Imaging System Group of the Science Technology
# Facilities Council, STFC
# This program 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.
#
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
from ccpi.optimisation.operators import LinearOperator
from ccpi.framework import ImageGeometry, AcquisitionGeometry
from ccpi.astra.processors import AstraForwardProjector3D, AstraBackProjector3D
import numpy as np
class AstraProjector3DSimple(LinearOperator):
"""ASTRA projector modified to use DataSet and geometry."""
def __init__(self, geomv, geomp):
super(AstraProjector3DSimple, self).__init__()
# Store volume and sinogram geometries.
# The order of the ouput sinogram is not the default one from the acquistion geometry
# The order of the backprojection is the default one from the image geometry
geomp.dimension_labels = ['vertical','angle','horizontal']
geomp.shape = (geomp.pixel_num_v, len(geomp.angles), geomp.pixel_num_h)
self.sinogram_geometry = geomp
self.volume_geometry = geomv
self.fp = AstraForwardProjector3D(volume_geometry=geomv,
sinogram_geometry=geomp,
output_axes_order=['vertical','angle','horizontal'])
self.bp = AstraBackProjector3D(volume_geometry=geomv,
sinogram_geometry=geomp,
output_axes_order=['vertical','horizontal_y','horizontal_x'])
# Initialise empty for singular value.
self.s1 = None
def direct(self, IM, out=None):
self.fp.set_input(IM)
if out is None:
return self.fp.get_output()
else:
out.fill(self.fp.get_output())
def adjoint(self, DATA, out=None):
self.bp.set_input(DATA)
if out is None:
return self.bp.get_output()
else:
out.fill(self.bp.get_output())
def domain_geometry(self):
return self.volume_geometry
def range_geometry(self):
return self.sinogram_geometry
def norm(self):
x0 = self.volume_geometry.allocate('random')
self.s1, sall, svec = LinearOperator.PowerMethod(self, 50, x0)
return self.s1
if __name__ == '__main__':
N = 30
angles = np.linspace(0, np.pi, 180)
ig = ImageGeometry(N, N, N)
ag = AcquisitionGeometry('parallel','3D', angles, pixel_num_h = N, pixel_num_v=5)
A = AstraProjector3DSimple(ig, ag)
print(A.norm())
x = ig.allocate('random_int')
sin = A.direct(x)
y = ag.allocate('random_int')
im = A.adjoint(y)
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