diff options
Diffstat (limited to 'python')
| -rw-r--r-- | python/astra/PyIncludes.pxd | 4 | ||||
| -rw-r--r-- | python/astra/creators.py | 13 | ||||
| -rw-r--r-- | python/astra/data2d_c.pyx | 4 | ||||
| -rw-r--r-- | python/astra/functions.py | 56 |
4 files changed, 76 insertions, 1 deletions
diff --git a/python/astra/PyIncludes.pxd b/python/astra/PyIncludes.pxd index b40d787..1c7973a 100644 --- a/python/astra/PyIncludes.pxd +++ b/python/astra/PyIncludes.pxd @@ -128,6 +128,10 @@ cdef extern from "astra/FanFlatVecProjectionGeometry2D.h" namespace "astra": cdef cppclass CFanFlatVecProjectionGeometry2D: CFanFlatVecProjectionGeometry2D() +cdef extern from "astra/ParallelVecProjectionGeometry2D.h" namespace "astra": + cdef cppclass CParallelVecProjectionGeometry2D: + CParallelVecProjectionGeometry2D() + cdef extern from "astra/ParallelProjectionGeometry2D.h" namespace "astra": cdef cppclass CParallelProjectionGeometry2D: CParallelProjectionGeometry2D() diff --git a/python/astra/creators.py b/python/astra/creators.py index 53d98e0..4ddaf0c 100644 --- a/python/astra/creators.py +++ b/python/astra/creators.py @@ -154,6 +154,13 @@ This method can be called in a number of ways: :type angles: :class:`numpy.ndarray` :returns: A parallel projection geometry. +``create_proj_geom('parallel_vec', det_count, V)``: + +:param det_count: Number of detector pixels. +:type det_count: :class:`int` +:param V: Vector array. +:type V: :class:`numpy.ndarray` +:returns: A parallel-beam projection geometry. ``create_proj_geom('fanflat', det_width, det_count, angles, source_origin, origin_det)``: @@ -241,6 +248,12 @@ This method can be called in a number of ways: raise Exception( 'not enough variables: astra_create_proj_geom(parallel, detector_spacing, det_count, angles)') return {'type': 'parallel', 'DetectorWidth': args[0], 'DetectorCount': args[1], 'ProjectionAngles': args[2]} + elif intype == 'parallel_vec': + if len(args) < 2: + raise Exception('not enough variables: astra_create_proj_geom(parallel_vec, det_count, V)') + if not args[1].shape[1] == 6: + raise Exception('V should be a Nx6 matrix, with N the number of projections') + return {'type':'parallel_vec', 'DetectorCount':args[0], 'Vectors':args[1]} elif intype == 'fanflat': if len(args) < 5: raise Exception('not enough variables: astra_create_proj_geom(fanflat, det_width, det_count, angles, source_origin, origin_det)') diff --git a/python/astra/data2d_c.pyx b/python/astra/data2d_c.pyx index 9c88073..1b1125d 100644 --- a/python/astra/data2d_c.pyx +++ b/python/astra/data2d_c.pyx @@ -111,6 +111,8 @@ def create(datatype, geometry, data=None, link=False): ppGeometry = <CProjectionGeometry2D * >new CFanFlatProjectionGeometry2D() elif (tpe == 'fanflat_vec'): ppGeometry = <CProjectionGeometry2D * >new CFanFlatVecProjectionGeometry2D() + elif (tpe == 'parallel_vec'): + ppGeometry = <CProjectionGeometry2D * >new CParallelVecProjectionGeometry2D() else: ppGeometry = <CProjectionGeometry2D * >new CParallelProjectionGeometry2D() if not ppGeometry.initialize(cfg[0]): @@ -225,6 +227,8 @@ def change_geometry(i, geom): ppGeometry = <CProjectionGeometry2D * >new CFanFlatProjectionGeometry2D() elif (tpe == 'fanflat_vec'): ppGeometry = <CProjectionGeometry2D * >new CFanFlatVecProjectionGeometry2D() + elif (tpe == 'parallel_vec'): + ppGeometry = <CProjectionGeometry2D * >new CParallelVecProjectionGeometry2D() else: ppGeometry = <CProjectionGeometry2D * >new CParallelProjectionGeometry2D() if not ppGeometry.initialize(cfg[0]): diff --git a/python/astra/functions.py b/python/astra/functions.py index 7277de5..b3a470d 100644 --- a/python/astra/functions.py +++ b/python/astra/functions.py @@ -172,7 +172,27 @@ def geom_2vec(proj_geom): :param proj_geom: Projection geometry to convert :type proj_geom: :class:`dict` """ - if proj_geom['type'] == 'fanflat': + + if proj_geom['type'] == 'parallel': + angles = proj_geom['ProjectionAngles'] + vectors = np.zeros((len(angles), 6)) + for i in range(len(angles)): + + # source + vectors[i, 0] = np.sin(angles[i]) + vectors[i, 1] = -np.cos(angles[i]) + + # center of detector + vectors[i, 2] = 0 + vectors[i, 3] = 0 + + # vector from detector pixel 0 to 1 + vectors[i, 4] = np.cos(angles[i]) * proj_geom['DetectorWidth'] + vectors[i, 5] = np.sin(angles[i]) * proj_geom['DetectorWidth'] + proj_geom_out = ac.create_proj_geom( + 'parallel_vec', proj_geom['DetectorCount'], vectors) + + elif proj_geom['type'] == 'fanflat': angles = proj_geom['ProjectionAngles'] vectors = np.zeros((len(angles), 6)) for i in range(len(angles)): @@ -251,3 +271,37 @@ def geom_2vec(proj_geom): raise ValueError( 'No suitable vector geometry found for type: ' + proj_geom['type']) return proj_geom_out + + +def geom_postalignment(proj_geom, factor): + """Returns the size of a volume or sinogram, based on the projection or volume geometry. + + :param proj_geom: input projection geometry (vector-based only, use astra.geom_2vec to convert conventional projection geometries) + :type proj_geom: :class:`dict` + :param factor: Optional axis index to return + :type factor: :class:`float` + """ + + if proj_geom['type'] == 'parallel_vec' or proj_geom['type'] == 'fanflat_vec': + for i in range(proj_geom['Vectors'].shape[0]): + proj_geom['Vectors'][i,2] = proj_geom['Vectors'][i,2] + factor * proj_geom['Vectors'][i,4]; + proj_geom['Vectors'][i,3] = proj_geom['Vectors'][i,3] + factor * proj_geom['Vectors'][i,5]; + + elif proj_geom['type'] == 'parallel3d_vec' or proj_geom['type'] == 'cone_vec': + + if len(factor) == 1: + for i in range(proj_geom['Vectors'].shape[0]): + proj_geom['Vectors'][i,3] = proj_geom['Vectors'][i,3] + factor * proj_geom['Vectors'][i,6]; + proj_geom['Vectors'][i,4] = proj_geom['Vectors'][i,4] + factor * proj_geom['Vectors'][i,7]; + proj_geom['Vectors'][i,5] = proj_geom['Vectors'][i,5] + factor * proj_geom['Vectors'][i,8]; + + elif len(factor) > 1: + for i in range(proj_geom['Vectors'].shape[0]): + proj_geom['Vectors'][i,3] = proj_geom['Vectors'][i,3] + factor[0] * proj_geom['Vectors'][i,6] + factor[1] * proj_geom['Vectors'][i, 9]; + proj_geom['Vectors'][i,4] = proj_geom['Vectors'][i,4] + factor[0] * proj_geom['Vectors'][i,7] + factor[1] * proj_geom['Vectors'][i,10]; + proj_geom['Vectors'][i,5] = proj_geom['Vectors'][i,5] + factor[0] * proj_geom['Vectors'][i,8] + factor[1] * proj_geom['Vectors'][i,11]; + else: + raise ValueError('No suitable geometry for postalignment: ' + proj_geom['type']) + + return proj_geom + |