Merge pull request #1 from vais-ral/remove_generic_processors

removes generic processors which go in CCPi-Framework

1 files changed, 0 insertions, 616 deletions

diff --git a/Wrappers/Python/ccpi/plugins/processors.py b/Wrappers/Python/ccpi/plugins/processors.py
index 2fd3bf1..e05c6ca 100755
--- a/Wrappers/Python/ccpi/plugins/processors.py
+++ b/Wrappers/Python/ccpi/plugins/processors.py
@@ -27,369 +27,6 @@ from scipy import ndimage
 import matplotlib.pyplot as plt

 

 

-class Normalizer(DataProcessor):

-    '''Normalization based on flat and dark

-    

-    This processor read in a AcquisitionData and normalises it based on 

-    the instrument reading with and without incident photons or neutrons.

-    

-    Input: AcquisitionData

-    Parameter: 2D projection with flat field (or stack)

-               2D projection with dark field (or stack)

-    Output: AcquisitionDataSetn

-    '''

-    

-    def __init__(self, flat_field = None, dark_field = None, tolerance = 1e-5):

-        kwargs = {

-                  'flat_field'  : None, 

-                  'dark_field'  : None,

-                  # very small number. Used when there is a division by zero

-                  'tolerance'   : tolerance

-                  }

-        

-        #DataProcessor.__init__(self, **kwargs)

-        super(Normalizer, self).__init__(**kwargs)

-        if not flat_field is None:

-            self.set_flat_field(flat_field)

-        if not dark_field is None:

-            self.set_dark_field(dark_field)

-    

-    def check_input(self, dataset):

-        if dataset.number_of_dimensions == 3:

-               return True

-        else:

-            raise ValueError("Expected input dimensions is 2 or 3, got {0}"\

-                             .format(dataset.number_of_dimensions))

-    

-    def set_dark_field(self, df):

-        if type(df) is numpy.ndarray:

-            if len(numpy.shape(df)) == 3:

-                raise ValueError('Dark Field should be 2D')

-            elif len(numpy.shape(df)) == 2:

-                self.dark_field = df

-        elif issubclass(type(df), DataSet):

-            self.dark_field = self.set_dark_field(df.as_array())

-    

-    def set_flat_field(self, df):

-        if type(df) is numpy.ndarray:

-            if len(numpy.shape(df)) == 3:

-                raise ValueError('Flat Field should be 2D')

-            elif len(numpy.shape(df)) == 2:

-                self.flat_field = df

-        elif issubclass(type(df), DataSet):

-            self.flat_field = self.set_flat_field(df.as_array())

-    

-    @staticmethod

-    def normalize_projection(projection, flat, dark, tolerance):

-        a = (projection - dark)

-        b = (flat-dark)

-        with numpy.errstate(divide='ignore', invalid='ignore'):

-            c = numpy.true_divide( a, b )

-            c[ ~ numpy.isfinite( c )] = tolerance # set to not zero if 0/0 

-        return c

-    

-    def process(self):

-        

-        projections = self.get_input()

-        dark = self.dark_field

-        flat = self.flat_field

-        

-        if not (projections.shape[1:] == dark.shape and \

-           projections.shape[1:] == flat.shape):

-            raise ValueError('Flats/Dark and projections size do not match.')

-            

-               

-        a = numpy.asarray(

-                [ Normalizer.normalize_projection(

-                        projection, flat, dark, self.tolerance) \

-                 for projection in projections.as_array() ]

-                )

-        y = type(projections)( a , True, 

-                    dimension_labels=projections.dimension_labels,

-                    geometry=projections.geometry)

-        return y

-    

-

-class CenterOfRotationFinder(DataProcessor):

-    '''Processor to find the center of rotation in a parallel beam experiment

-    

-    This processor read in a AcquisitionDataSet and finds the center of rotation 

-    based on Nghia Vo's method. https://doi.org/10.1364/OE.22.019078

-    

-    Input: AcquisitionDataSet

-    

-    Output: float. center of rotation in pixel coordinate

-    '''

-    

-    def __init__(self):

-        kwargs = {

-                  

-                  }

-        

-        #DataProcessor.__init__(self, **kwargs)

-        super(CenterOfRotationFinder, self).__init__(**kwargs)

-    

-    def check_input(self, dataset):

-        if dataset.number_of_dimensions == 3:

-            if dataset.geometry.geom_type == 'parallel':

-                return True

-            else:

-                raise ValueError('{0} is suitable only for parallel beam geometry'\

-                                 .format(self.__class__.__name__))

-        else:

-            raise ValueError("Expected input dimensions is 3, got {0}"\

-                             .format(dataset.number_of_dimensions))

-        

-    

-    # #########################################################################

-    # Copyright (c) 2015, UChicago Argonne, LLC. All rights reserved.         #

-    #                                                                         #

-    # Copyright 2015. UChicago Argonne, LLC. This software was produced       #

-    # under U.S. Government contract DE-AC02-06CH11357 for Argonne National   #

-    # Laboratory (ANL), which is operated by UChicago Argonne, LLC for the    #

-    # U.S. Department of Energy. The U.S. Government has rights to use,       #

-    # reproduce, and distribute this software.  NEITHER THE GOVERNMENT NOR    #

-    # UChicago Argonne, LLC MAKES ANY WARRANTY, EXPRESS OR IMPLIED, OR        #

-    # ASSUMES ANY LIABILITY FOR THE USE OF THIS SOFTWARE.  If software is     #

-    # modified to produce derivative works, such modified software should     #

-    # be clearly marked, so as not to confuse it with the version available   #

-    # from ANL.                                                               #

-    #                                                                         #

-    # Additionally, redistribution and use in source and binary forms, with   #

-    # or without modification, are permitted provided that the following      #

-    # conditions are met:                                                     #

-    #                                                                         #

-    #     * Redistributions of source code must retain the above copyright    #

-    #       notice, this list of conditions and the following disclaimer.     #

-    #                                                                         #

-    #     * Redistributions in binary form must reproduce the above copyright #

-    #       notice, this list of conditions and the following disclaimer in   #

-    #       the documentation and/or other materials provided with the        #

-    #       distribution.                                                     #

-    #                                                                         #

-    #     * Neither the name of UChicago Argonne, LLC, Argonne National       #

-    #       Laboratory, ANL, the U.S. Government, nor the names of its        #

-    #       contributors may be used to endorse or promote products derived   #

-    #       from this software without specific prior written permission.     #

-    #                                                                         #

-    # THIS SOFTWARE IS PROVIDED BY UChicago Argonne, LLC AND CONTRIBUTORS     #

-    # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT       #

-    # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS       #

-    # FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL UChicago     #

-    # Argonne, LLC OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,        #

-    # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,    #

-    # BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;        #

-    # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER        #

-    # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT      #

-    # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN       #

-    # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE         #

-    # POSSIBILITY OF SUCH DAMAGE.                                             #

-    # #########################################################################

-    

-    @staticmethod

-    def as_ndarray(arr, dtype=None, copy=False):

-        if not isinstance(arr, numpy.ndarray):

-            arr = numpy.array(arr, dtype=dtype, copy=copy)

-        return arr

-    

-    @staticmethod

-    def as_dtype(arr, dtype, copy=False):

-        if not arr.dtype == dtype:

-            arr = numpy.array(arr, dtype=dtype, copy=copy)

-        return arr

-    

-    @staticmethod

-    def as_float32(arr):

-        arr = CenterOfRotationFinder.as_ndarray(arr, numpy.float32)

-        return CenterOfRotationFinder.as_dtype(arr, numpy.float32)

-    

-    

-    

-    

-    @staticmethod

-    def find_center_vo(tomo, ind=None, smin=-40, smax=40, srad=10, step=0.5,

-                       ratio=2., drop=20):

-        """

-        Find rotation axis location using Nghia Vo's method. :cite:`Vo:14`.

-    

-        Parameters

-        ----------

-        tomo : ndarray

-            3D tomographic data.

-        ind : int, optional

-            Index of the slice to be used for reconstruction.

-        smin, smax : int, optional

-            Reference to the horizontal center of the sinogram.

-        srad : float, optional

-            Fine search radius.

-        step : float, optional

-            Step of fine searching.

-        ratio : float, optional

-            The ratio between the FOV of the camera and the size of object.

-            It's used to generate the mask.

-        drop : int, optional

-            Drop lines around vertical center of the mask.

-    

-        Returns

-        -------

-        float

-            Rotation axis location.

-            

-        Notes

-        -----

-        The function may not yield a correct estimate, if:

-        

-        - the sample size is bigger than the field of view of the camera. 

-          In this case the ``ratio`` argument need to be set larger

-          than the default of 2.0.

-        

-        - there is distortion in the imaging hardware. If there's 

-          no correction applied, the center of the projection image may 

-          yield a better estimate.

-        

-        - the sample contrast is weak. Paganin's filter need to be applied 

-          to overcome this. 

-       

-        - the sample was changed during the scan. 

-        """

-        tomo = CenterOfRotationFinder.as_float32(tomo)

-    

-        if ind is None:

-            ind = tomo.shape[1] // 2

-        _tomo = tomo[:, ind, :]

-    

-        

-    

-        # Reduce noise by smooth filters. Use different filters for coarse and fine search 

-        _tomo_cs = ndimage.filters.gaussian_filter(_tomo, (3, 1))

-        _tomo_fs = ndimage.filters.median_filter(_tomo, (2, 2))

-    

-        # Coarse and fine searches for finding the rotation center.

-        if _tomo.shape[0] * _tomo.shape[1] > 4e6:  # If data is large (>2kx2k)

-            #_tomo_coarse = downsample(numpy.expand_dims(_tomo_cs,1), level=2)[:, 0, :]

-            #init_cen = _search_coarse(_tomo_coarse, smin, smax, ratio, drop)

-            #fine_cen = _search_fine(_tomo_fs, srad, step, init_cen*4, ratio, drop)

-            init_cen = CenterOfRotationFinder._search_coarse(_tomo_cs, smin, 

-                                                             smax, ratio, drop)

-            fine_cen = CenterOfRotationFinder._search_fine(_tomo_fs, srad, 

-                                                           step, init_cen, 

-                                                           ratio, drop)

-        else:

-            init_cen = CenterOfRotationFinder._search_coarse(_tomo_cs, 

-                                                             smin, smax, 

-                                                             ratio, drop)

-            fine_cen = CenterOfRotationFinder._search_fine(_tomo_fs, srad, 

-                                                           step, init_cen, 

-                                                           ratio, drop)

-    

-        #logger.debug('Rotation center search finished: %i', fine_cen)

-        return fine_cen

-

-

-    @staticmethod

-    def _search_coarse(sino, smin, smax, ratio, drop):

-        """

-        Coarse search for finding the rotation center.

-        """

-        (Nrow, Ncol) = sino.shape

-        centerfliplr = (Ncol - 1.0) / 2.0

-    

-        # Copy the sinogram and flip left right, the purpose is to

-        # make a full [0;2Pi] sinogram

-        _copy_sino = numpy.fliplr(sino[1:])

-    

-        # This image is used for compensating the shift of sinogram 2

-        temp_img = numpy.zeros((Nrow - 1, Ncol), dtype='float32')

-        temp_img[:] = sino[-1]

-    

-        # Start coarse search in which the shift step is 1

-        listshift = numpy.arange(smin, smax + 1)

-        listmetric = numpy.zeros(len(listshift), dtype='float32')

-        mask = CenterOfRotationFinder._create_mask(2 * Nrow - 1, Ncol, 

-                                                   0.5 * ratio * Ncol, drop)

-        for i in listshift:

-            _sino = numpy.roll(_copy_sino, i, axis=1)

-            if i >= 0:

-                _sino[:, 0:i] = temp_img[:, 0:i]

-            else:

-                _sino[:, i:] = temp_img[:, i:]

-            listmetric[i - smin] = numpy.sum(numpy.abs(numpy.fft.fftshift(

-                #pyfftw.interfaces.numpy_fft.fft2(

-                #    numpy.vstack((sino, _sino)))

-                numpy.fft.fft2(numpy.vstack((sino, _sino)))

-                )) * mask)

-        minpos = numpy.argmin(listmetric)

-        return centerfliplr + listshift[minpos] / 2.0

-    

-    @staticmethod

-    def _search_fine(sino, srad, step, init_cen, ratio, drop):

-        """

-        Fine search for finding the rotation center.

-        """

-        Nrow, Ncol = sino.shape

-        centerfliplr = (Ncol + 1.0) / 2.0 - 1.0

-        # Use to shift the sinogram 2 to the raw CoR.

-        shiftsino = numpy.int16(2 * (init_cen - centerfliplr))

-        _copy_sino = numpy.roll(numpy.fliplr(sino[1:]), shiftsino, axis=1)

-        if init_cen <= centerfliplr:

-            lefttake = numpy.int16(numpy.ceil(srad + 1))

-            righttake = numpy.int16(numpy.floor(2 * init_cen - srad - 1))

-        else:

-            lefttake = numpy.int16(numpy.ceil(

-                init_cen - (Ncol - 1 - init_cen) + srad + 1))

-            righttake = numpy.int16(numpy.floor(Ncol - 1 - srad - 1))

-        Ncol1 = righttake - lefttake + 1

-        mask = CenterOfRotationFinder._create_mask(2 * Nrow - 1, Ncol1, 

-                                                   0.5 * ratio * Ncol, drop)

-        numshift = numpy.int16((2 * srad) / step) + 1

-        listshift = numpy.linspace(-srad, srad, num=numshift)

-        listmetric = numpy.zeros(len(listshift), dtype='float32')

-        factor1 = numpy.mean(sino[-1, lefttake:righttake])

-        num1 = 0

-        for i in listshift:

-            _sino = ndimage.interpolation.shift(

-                _copy_sino, (0, i), prefilter=False)

-            factor2 = numpy.mean(_sino[0,lefttake:righttake])

-            _sino = _sino * factor1 / factor2

-            sinojoin = numpy.vstack((sino, _sino))

-            listmetric[num1] = numpy.sum(numpy.abs(numpy.fft.fftshift(

-                #pyfftw.interfaces.numpy_fft.fft2(

-                #    sinojoin[:, lefttake:righttake + 1])

-                numpy.fft.fft2(sinojoin[:, lefttake:righttake + 1])

-                )) * mask)

-            num1 = num1 + 1

-        minpos = numpy.argmin(listmetric)

-        return init_cen + listshift[minpos] / 2.0

-    

-    @staticmethod

-    def _create_mask(nrow, ncol, radius, drop):

-        du = 1.0 / ncol

-        dv = (nrow - 1.0) / (nrow * 2.0 * numpy.pi)

-        centerrow = numpy.ceil(nrow / 2) - 1

-        centercol = numpy.ceil(ncol / 2) - 1

-        # added by Edoardo Pasca

-        centerrow = int(centerrow)

-        centercol = int(centercol)

-        mask = numpy.zeros((nrow, ncol), dtype='float32')

-        for i in range(nrow):

-            num1 = numpy.round(((i - centerrow) * dv / radius) / du)

-            (p1, p2) = numpy.int16(numpy.clip(numpy.sort(

-                (-num1 + centercol, num1 + centercol)), 0, ncol - 1))

-            mask[i, p1:p2 + 1] = numpy.ones(p2 - p1 + 1, dtype='float32')

-        if drop < centerrow:

-            mask[centerrow - drop:centerrow + drop + 1,

-                 :] = numpy.zeros((2 * drop + 1, ncol), dtype='float32')

-        mask[:,centercol-1:centercol+2] = numpy.zeros((nrow, 3), dtype='float32')

-        return mask

-    

-    def process(self):

-        

-        projections = self.get_input()

-        

-        cor = CenterOfRotationFinder.find_center_vo(projections.as_array())

-        

-        return cor

-

 class CCPiForwardProjector(DataProcessor):

     '''Normalization based on flat and dark

     

@@ -537,256 +174,3 @@ class CCPiBackwardProjector(DataProcessor):
         else:

             raise ValueError('Cannot process cone beam')

             

-class AcquisitionDataPadder(DataProcessor):

-    '''Normalization based on flat and dark

-    

-    This processor read in a AcquisitionData and normalises it based on 

-    the instrument reading with and without incident photons or neutrons.

-    

-    Input: AcquisitionData

-    Parameter: 2D projection with flat field (or stack)

-               2D projection with dark field (or stack)

-    Output: AcquisitionDataSetn

-    '''

-    

-    def __init__(self, 

-                 center_of_rotation   = None,

-                 acquisition_geometry = None,

-                 pad_value            = 1e-5):

-        kwargs = {

-                  'acquisition_geometry' : acquisition_geometry, 

-                  'center_of_rotation'   : center_of_rotation,

-                  'pad_value'            : pad_value

-                  }

-        

-        super(AcquisitionDataPadder, self).__init__(**kwargs)

-        

-    def check_input(self, dataset):

-        if self.acquisition_geometry is None:

-            self.acquisition_geometry = dataset.geometry

-        if dataset.number_of_dimensions == 3:

-               return True

-        else:

-            raise ValueError("Expected input dimensions is 2 or 3, got {0}"\

-                             .format(dataset.number_of_dimensions))

-

-    def process(self):

-        projections = self.get_input()

-        w = projections.get_dimension_size('horizontal')

-        delta = w - 2 * self.center_of_rotation

-               

-        padded_width = int (

-                numpy.ceil(abs(delta)) + w

-                )

-        delta_pix = padded_width - w

-        

-        voxel_per_pixel = 1

-        geom = pbalg.pb_setup_geometry_from_acquisition(projections.as_array(),

-                                            self.acquisition_geometry.angles,

-                                            self.center_of_rotation,

-                                            voxel_per_pixel )

-        

-        padded_geometry = self.acquisition_geometry.clone()

-        

-        padded_geometry.pixel_num_h = geom['n_h']

-        padded_geometry.pixel_num_v = geom['n_v']

-        

-        delta_pix_h = padded_geometry.pixel_num_h - self.acquisition_geometry.pixel_num_h

-        delta_pix_v = padded_geometry.pixel_num_v - self.acquisition_geometry.pixel_num_v

-        

-        if delta_pix_h == 0:

-            delta_pix_h = delta_pix

-            padded_geometry.pixel_num_h = padded_width

-        #initialize a new AcquisitionData with values close to 0

-        out = AcquisitionData(geometry=padded_geometry)

-        out = out + self.pad_value

-        

-        

-        #pad in the horizontal-vertical plane -> slice on angles

-        if delta > 0:

-            #pad left of middle

-            command = "out.array["

-            for i in range(out.number_of_dimensions):

-                if out.dimension_labels[i] == 'horizontal':

-                    value = '{0}:{1}'.format(delta_pix_h, delta_pix_h+w)

-                    command = command + str(value)

-                else:

-                    if out.dimension_labels[i] == 'vertical' :

-                        value = '{0}:'.format(delta_pix_v)

-                        command = command + str(value)

-                    else:

-                        command = command + ":"

-                if i < out.number_of_dimensions -1:

-                    command = command + ','

-            command = command + '] = projections.array'

-            #print (command)    

-        else:

-            #pad right of middle

-            command = "out.array["

-            for i in range(out.number_of_dimensions):

-                if out.dimension_labels[i] == 'horizontal':

-                    value = '{0}:{1}'.format(0, w)

-                    command = command + str(value)

-                else:

-                    if out.dimension_labels[i] == 'vertical' :

-                        value = '{0}:'.format(delta_pix_v)

-                        command = command + str(value)

-                    else:

-                        command = command + ":"

-                if i < out.number_of_dimensions -1:

-                    command = command + ','

-            command = command + '] = projections.array'

-            #print (command)    

-            #cleaned = eval(command)

-        exec(command)

-        return out

-        

-#class FiniteDifferentiator(DataProcessor):

-#    def __init__(self):

-#        kwargs = {

-#                  

-#                  }

-#        

-#        super(FiniteDifferentiator, self).__init__(**kwargs)

-#        

-#    def check_input(self, dataset):

-#        return True

-#    

-#    def process(self):

-#        axis = 0

-#        d1 = numpy.diff(x,n=1,axis=axis)

-#        d1 = numpy.resize(d1, numpy.shape(x))

-

-        

-

-def loadNexus(filename):

-    '''Load a dataset stored in a NeXuS file (HDF5)'''

-    ###########################################################################

-    ## Load a dataset

-    nx = h5py.File(filename, "r")

-    

-    data = nx.get('entry1/tomo_entry/data/rotation_angle')

-    angles = numpy.zeros(data.shape)

-    data.read_direct(angles)

-    

-    data = nx.get('entry1/tomo_entry/data/data')

-    stack = numpy.zeros(data.shape)

-    data.read_direct(stack)

-    data = nx.get('entry1/tomo_entry/instrument/detector/image_key')

-    

-    itype = numpy.zeros(data.shape)

-    data.read_direct(itype)

-    # 2 is dark field

-    darks = [stack[i] for i in range(len(itype)) if itype[i] == 2 ]

-    dark = darks[0]

-    for i in range(1, len(darks)):

-        dark += darks[i]

-    dark = dark / len(darks)

-    #dark[0][0] = dark[0][1]

-    

-    # 1 is flat field

-    flats = [stack[i] for i in range(len(itype)) if itype[i] == 1 ]

-    flat = flats[0]

-    for i in range(1, len(flats)):

-        flat += flats[i]

-    flat = flat / len(flats)

-    #flat[0][0] = dark[0][1]

-    

-    

-    # 0 is projection data

-    proj = [stack[i] for i in range(len(itype)) if itype[i] == 0 ]

-    angle_proj = [angles[i] for i in range(len(itype)) if itype[i] == 0 ]

-    angle_proj = numpy.asarray (angle_proj)

-    angle_proj = angle_proj.astype(numpy.float32)

-    

-    return angle_proj , numpy.asarray(proj) , dark, flat

-    

-    

-    

-if __name__ == '__main__':

-    angles, proj, dark, flat = loadNexus('../../../data/24737_fd.nxs')

-    

-    parallelbeam = AcquisitionGeometry('parallel', '3D' , 

-                                 angles=angles, 

-                                 pixel_num_h=numpy.shape(proj)[2],

-                                 pixel_num_v=numpy.shape(proj)[1],

-                                 )    

-    

-    dim_labels = ['angles' , 'vertical' , 'horizontal']

-    sino = AcquisitionData( proj , geometry=parallelbeam, 

-                            dimension_labels=dim_labels)

-    

-    normalizer = Normalizer()

-    normalizer.set_input(sino)

-    normalizer.set_flat_field(flat)

-    normalizer.set_dark_field(dark)

-    norm = normalizer.get_output()

-    #print ("Processor min {0} max {1}".format(norm.as_array().min(), norm.as_array().max()))

-    

-    #norm1 = numpy.asarray(

-    #        [Normalizer.normalize_projection( p, flat, dark, 1e-5 ) 

-    #       for p in proj]

-    #        )

-    

-    #print ("Numpy min {0} max {1}".format(norm1.min(), norm1.max()))

-    

-    cor_finder = CenterOfRotationFinder()

-    cor_finder.set_input(sino)

-    cor = cor_finder.get_output()

-    print ("center of rotation {0} == 86.25?".format(cor))

-    

-        

-    padder = AcquisitionDataPadder(center_of_rotation=cor, 

-                                   pad_value=0.75,

-                                   acquisition_geometry=normalizer.get_output().geometry)

-    #padder.set_input(normalizer.get_output())

-    padder.set_input_processor(normalizer)

-    

-    #print ("padder ", padder.get_output())

-    

-    volume_geometry = ImageGeometry()

-    

-    back = CCPiBackwardProjector(acquisition_geometry=parallelbeam, 

-                                 image_geometry=volume_geometry)

-    back.set_input_processor(padder)

-    #back.set_input(padder.get_output())

-    #print (back.image_geometry)

-    forw = CCPiForwardProjector(acquisition_geometry=parallelbeam, 

-                                 image_geometry=volume_geometry)

-    forw.set_input_processor(back)

-    

-

-    out  = padder.get_output()

-    fig = plt.figure()

-    # projections row

-    a = fig.add_subplot(1,4,1)    

-    a.imshow(norm.array[80])

-    a.set_title('orig')

-    a = fig.add_subplot(1,4,2)    

-    a.imshow(out.array[80])

-    a.set_title('padded')

-    

-    a = fig.add_subplot(1,4,3)    

-    a.imshow(back.get_output().as_array()[15])

-    a.set_title('back')

-    

-    a = fig.add_subplot(1,4,4)    

-    a.imshow(forw.get_output().as_array()[80])

-    a.set_title('forw')

-    

-    

-    plt.show()

-

-    

-    conebeam = AcquisitionGeometry('cone', '3D' , 

-                                 angles=angles, 

-                                 pixel_num_h=numpy.shape(proj)[2],

-                                 pixel_num_v=numpy.shape(proj)[1],

-                                 )    

-    

-    try:

-        sino2 = AcquisitionData( proj , geometry=conebeam)

-        cor_finder.set_input(sino2)

-        cor = cor_finder.get_output()

-    except ValueError as err:

-        print (err)
\ No newline at end of file