diff options
Diffstat (limited to 'Wrappers/Python/ccpi/astra/operators/AstraProjector3DSimple.py')
| -rw-r--r-- | Wrappers/Python/ccpi/astra/operators/AstraProjector3DSimple.py | 49 |
1 files changed, 39 insertions, 10 deletions
diff --git a/Wrappers/Python/ccpi/astra/operators/AstraProjector3DSimple.py b/Wrappers/Python/ccpi/astra/operators/AstraProjector3DSimple.py index fabfe33..a139f64 100644 --- a/Wrappers/Python/ccpi/astra/operators/AstraProjector3DSimple.py +++ b/Wrappers/Python/ccpi/astra/operators/AstraProjector3DSimple.py @@ -15,19 +15,27 @@ # 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 Operator, LinearOperator -from ccpi.framework import AcquisitionData, ImageData, DataContainer -from ccpi.astra.processors import AstraForwardProjector, AstraBackProjector, \ - AstraForwardProjector3D, AstraBackProjector3D +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. - self.sinogram_geometry = geomp - self.volume_geometry = geomv + # 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, @@ -36,7 +44,7 @@ class AstraProjector3DSimple(LinearOperator): 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 @@ -60,9 +68,30 @@ class AstraProjector3DSimple(LinearOperator): return self.volume_geometry def range_geometry(self): - return self.sinogram_geometry - + 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
\ No newline at end of file + 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) + + + +
\ No newline at end of file |