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# -----------------------------------------------------------------------
# Copyright: 2010-2021, imec Vision Lab, University of Antwerp
# 2013-2021, CWI, Amsterdam
#
# Contact: astra@astra-toolbox.com
# Website: http://www.astra-toolbox.com/
#
# This file is part of the ASTRA Toolbox.
#
#
# 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 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 ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
#
# -----------------------------------------------------------------------
"""Additional purely Python functions for PyAstraToolbox.
.. moduleauthor:: Daniel M. Pelt <D.M.Pelt@cwi.nl>
"""
import numpy as np
def geom_size(geom, dim=None):
"""Returns the size of a volume or sinogram, based on the projection or volume geometry.
:param geom: Geometry to calculate size from
:type geometry: :class:`dict`
:param dim: Optional axis index to return
:type dim: :class:`int`
"""
if 'GridSliceCount' in geom:
# 3D Volume geometry?
s = (geom['GridSliceCount'], geom[
'GridRowCount'], geom['GridColCount'])
elif 'GridColCount' in geom:
# 2D Volume geometry?
s = (geom['GridRowCount'], geom['GridColCount'])
elif geom['type'] == 'parallel' or geom['type'] == 'fanflat':
s = (len(geom['ProjectionAngles']), geom['DetectorCount'])
elif geom['type'] == 'parallel3d' or geom['type'] == 'cone':
s = (geom['DetectorRowCount'], len(
geom['ProjectionAngles']), geom['DetectorColCount'])
elif geom['type'] == 'fanflat_vec' or geom['type'] == 'parallel_vec':
s = (geom['Vectors'].shape[0], geom['DetectorCount'])
elif geom['type'] == 'parallel3d_vec' or geom['type'] == 'cone_vec':
s = (geom['DetectorRowCount'], geom[
'Vectors'].shape[0], geom['DetectorColCount'])
if dim != None:
s = s[dim]
return s
def checkArrayForLink(data):
"""Check if a numpy array is suitable for direct usage (contiguous, etc.)
This function raises an exception if not.
"""
if not isinstance(data, np.ndarray):
raise ValueError("Numpy array should be numpy.ndarray")
if data.dtype != np.float32:
raise ValueError("Numpy array should be float32")
if not (data.flags['C_CONTIGUOUS'] and data.flags['ALIGNED']):
raise ValueError("Numpy array should be C_CONTIGUOUS and ALIGNED")
class GPULink(object):
"""Utility class for astra.data3d.link with a CUDA pointer
The CUDA pointer ptr must point to an array of floats.
x is the fastest-changing coordinate, z the slowest-changing.
pitch is the width in bytes of the memory block. For a contiguous
memory block, pitch is equal to sizeof(float) * x. For a memory block
allocated by cudaMalloc3D, pitch is the pitch as returned by cudaMalloc3D.
"""
def __init__(self, ptr, x, y, z, pitch):
self.ptr = ptr
self.x = x
self.y = y
self.z = z
self.pitch = pitch
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