added codes
This commit is contained in:
MiriamLoecke
717
python_code/unwrapper.py
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717
python_code/unwrapper.py
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# Import modules here
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from __future__ import print_function
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import numpy as np
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import math
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from fenics import *
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from numpy.core.fromnumeric import shape
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from numpy.lib.npyio import save
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import scipy.sparse as sp
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from scipy.sparse import csc_matrix
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from scipy.sparse.linalg import spsolve
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import decimal
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import time
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class Unwrapper:
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def __init__(self, options):
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#self.method = options['method']
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self.in_file = options['io']['in_file']
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self.savepath = options['io']['savepath']
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self.save_checkpoints = options['io']['write_checkpoints']
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self.save_xdmf = options['io']['write_xdmf']
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self.venc = options['VENC']
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self.dt = options['dt']
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self.mesh_options = options['mesh']
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#get method-specific parameters from the options
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if 'Temporal' in options['unwrapping']:
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self.t_ref = options['unwrapping']['Temporal']['t_ref']
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#if self.method == 'Probability':
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if 'Probability' in options['unwrapping']:
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self.n_low = options['unwrapping']['Probability']['nlow']
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self.n_high = options['unwrapping']['Probability']['nhigh']
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self.t_low = options['unwrapping']['Probability']['t_low']
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self.t_high = options['unwrapping']['Probability']['t_high']
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self.w_s = options['unwrapping']['Probability']['w_s']
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self.w_t = options['unwrapping']['Probability']['w_t']
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self.path_addons = {}
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for method in options['unwrapping']:
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self.path_addons[method] = options['unwrapping'][method]['path_addon']
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#get mesh from the input file, with boundaries
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self.mesh = Mesh()
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h5 = HDF5File(self.mesh.mpi_comm(), options['mesh_file'], 'r')
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h5.read(self.mesh, 'mesh', False)
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if h5.has_dataset('boundaries'):
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self.bnds = MeshFunction('size_t', self.mesh, self.mesh.topology().dim()-1)
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h5.read(self.bnds, 'boundaries')
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#assuming we only ever work in one function space
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self.mesh_type = self.mesh_options['mesh_type']
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if self.mesh_type == 'slice':
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self.V = FunctionSpace(self.mesh, 'DG', 0)
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else:
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self.V = FunctionSpace(self.mesh, 'P', 1)
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def set_method(self, new_method):
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self.method = new_method
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def save(self, u_list, filelist, save_checkpoints = False, savepath = False):
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comm = self.mesh.mpi_comm()
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if not savepath:
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savepath = str(self.savepath)
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xdmf_u = XDMFFile(savepath + 'u.xdmf')
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u = Function(self.V)
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u.rename('velocity', 'u')
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for l in range(len(u_list)):
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# writing xdmf
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u.assign(u_list[l])
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xdmf_u.write(u, l*self.dt)
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# writing checkpoint
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if save_checkpoints:
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if filelist:
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print('saving checkpoint', l)
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ckpath = filelist[l].replace(self.in_file, savepath)
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hdf = HDF5File(comm, ckpath, 'w')
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hdf.write(u, '/u', float(l*self.dt))
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hdf.close()
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else:
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print('saving checkpoint', l)
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ckpath = savepath
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name = '/u{i}'.format(i = math.ceil(l*self.dt*1000)) + '.h5'
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hdf = HDF5File(comm, ckpath + name, 'w')
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hdf.write(u, '/u', float(l*self.dt))
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hdf.close()
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def make_numpy_box(self, velocity, save_numpy = True, save_box = False):
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'''
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makes numpy array from fenics functions on aorta mesh
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Args (list): velocity input
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Return (list): numpy array
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can also save intermittent fenics function on box mesh
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'''
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#this only works for scalar data for now!
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#find mesh dimensions and stuff
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self.Lt = len(velocity)
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coords = self.mesh.coordinates()
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[x0, x1] = [np.min(coords[:, 0]), np.max(coords[:, 0])]
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[y0, y1] = [np.min(coords[:, 1]), np.max(coords[:, 1])]
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[z0, z1] = [np.min(coords[:, 2]), np.max(coords[:, 2])]
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[dx, dy, dz] = self.mesh_options['dxs']
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[Lx, Ly, Lz] = [math.ceil((x1-x0)/dx), math.ceil((y1-y0)/dy), math.ceil((z1 - z0)/dz)]
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# new spatial coordinates for the box-mesh
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deltax = (dx*(Lx) - (x1 - x0))/2
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deltay = (dy*(Ly) - (y1 - y0))/2
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deltaz = (dz*(Lz) - (z1 - z0))/2
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x0_new = x0 - deltax
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x1_new = x1 + deltax
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y0_new = y0 - deltay
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y1_new = y1 + deltay
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z0_new = z0 - deltaz
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z1_new = z1 + deltaz
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# Defining the box-mesh
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if self.mesh_type == 'aorta':
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boxmesh = BoxMesh(Point(x0_new,y0_new,z0_new),Point(x1_new,y1_new,z1_new),Lx,Ly,Lz)
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Vbox = FunctionSpace(boxmesh, 'P', 1)
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Xt = Vbox.tabulate_dof_coordinates()
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else:
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Xt = self.V.tabulate_dof_coordinates()
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# This array contains indexes instead of coordinates
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SqXt = np.zeros(Xt.shape)
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decimal.getcontext().rounding = decimal.ROUND_HALF_UP
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for k in range(Xt.shape[0]):
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xkprime = round((Xt[k][0] - x0_new)/dx, 2)
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xk = int(decimal.Decimal(xkprime).to_integral_value())
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ykprime = round((Xt[k][1] - y0_new)/dy, 2)
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yk = int(decimal.Decimal(ykprime).to_integral_value())
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zkprime = round((Xt[k][2] - z0_new)/dx, 2)
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zk = int(decimal.Decimal(zkprime).to_integral_value())
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SqXt[k, 0] = int(xk)
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SqXt[k, 1] = int(yk)
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SqXt[k, 2] = int(zk)
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SqXt = SqXt.astype(int)
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u = Function(self.V)
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S = np.zeros((Lx+1, Ly+1, Lz+1, self.Lt))
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t = 0
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velocity_box = {}
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print('interpolating...')
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for t in range(self.Lt):
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u = velocity[t]
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if self.mesh_type == 'aorta':
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ubox = Function(Vbox)
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LagrangeInterpolator.interpolate(ubox, u)
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u2 = Function(Vbox)
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u2.assign(ubox)
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velocity_box[t] = u2
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values = ubox.vector()[:]
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else:
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values = u.vector()[:]
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for k in range(Xt.shape[0]):
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S[SqXt[k, 0], SqXt[k,1], SqXt[k,2], t] = values[k]
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t+=1
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if save_box == True:
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print('saving new meshes')
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xdmf = XDMFFile(self.in_file + 'ubox.xdmf')
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for t in range(self.Lt):
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velocity_box[t].rename('velocity', 'u')
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xdmf.write(velocity_box[t], t*self.dt)
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if save_numpy == True:
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np.save(self.in_file + 'u', S)
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return S
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def make_aorta_mesh(self, S, save_aorta = True, save_box = False):
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'''
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interpolate numpy array into aorta mesh
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Args(numpy array): S input data
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Return (list of fenics functions): same data, in aorta mesh
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can also save an intermittent fenics function on a box mesh
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'''
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#this only works for scalar data for now!
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coords = self.mesh.coordinates()
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[x0, x1] = [np.min(coords[:, 0]), np.max(coords[:, 0])]
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[y0, y1] = [np.min(coords[:, 1]), np.max(coords[:, 1])]
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[z0, z1] = [np.min(coords[:, 2]), np.max(coords[:, 2])]
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[dx, dy, dz] = self.mesh_options['dxs']
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[Lx, Ly, Lz] = [math.ceil((x1-x0)/dx), math.ceil((y1-y0)/dy), math.ceil((z1 - z0)/dz)]
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# new spatial coordinates for the box-mesh
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deltax = (dx*(Lx) - (x1 - x0))/2
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deltay = (dy*(Ly) - (y1 - y0))/2
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deltaz = (dz*(Lz) - (z1 - z0))/2
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x0_new = x0 - deltax
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x1_new = x1 + deltax
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y0_new = y0 - deltay
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y1_new = y1 + deltay
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z0_new = z0 - deltaz
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z1_new = z1 + deltaz
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# Defining the box-mesh
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mesh0 = BoxMesh(Point(x0_new,y0_new,z0_new),Point(x1_new,y1_new,z1_new),Lx,Ly,Lz)
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P1 = FunctionSpace(mesh0, 'P', 1)
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Xt = P1.tabulate_dof_coordinates()
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# This array contains indexes instead of coordinates
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SqXt = np.zeros(Xt.shape)
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decimal.getcontext().rounding = decimal.ROUND_HALF_UP
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for k in range(Xt.shape[0]):
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xkprime = round((Xt[k][0] - x0_new)/dx, 2)
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xk = int(decimal.Decimal(xkprime).to_integral_value())
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ykprime = round((Xt[k][1] - y0_new)/dy, 2)
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yk = int(decimal.Decimal(ykprime).to_integral_value())
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zkprime = round((Xt[k][2] - z0_new)/dx, 2)
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zk = int(decimal.Decimal(zkprime).to_integral_value())
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SqXt[k,0] = int(xk)
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SqXt[k,1] = int(yk)
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SqXt[k,2] = int(zk)
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SqXt = SqXt.astype(int) # To ensure int values!
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v = Function(self.V)
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velocity = [Function(self.V) for i in range(self.Lt)]
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velocity_box = [Function(P1) for i in range(self.Lt)]
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for t in range(self.Lt):
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v1 = Function(P1)
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values = np.zeros(v1.vector()[:].shape)
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for k in range(Xt.shape[0]):
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values[k] = S[SqXt[k, 0], SqXt[k, 1], SqXt[k, 2], t]
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v1.vector()[:] = values
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velocity_box[t] = v1
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v = Function(self.V)
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LagrangeInterpolator.interpolate(v, v1)
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if self.mesh_type == 'slice':
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#due to problems with interpolating into hexahedral meshes (it interpolates with fake zeros somehow?)
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#this multiplication is necessary for the slices
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v.vector()[:] *= 2
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velocity[t] = v
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if save_aorta == True:
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self.save(velocity, False, False, savepath=self.savepath + 'aorta/')
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if save_box == True:
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self.save(velocity_box, False, False, savepath = self.savepath + 'box/')
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return velocity
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def lap_unwrap(self, phiwin, nd = 3):
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'''
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Args (numpy array): wrapped phase
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Return (numpy array): unwrapped phase
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'''
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si = [phiwin.shape[0], phiwin.shape[1], phiwin.shape[2], phiwin.shape[3]]
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phiw = phiwin
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if self.mesh_type == 'slice':
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if nd == 3:
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[X, Y] = np.mgrid[-si[0]/2:si[0]/2, -si[1]/2:si[1]/2]
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ss = 4
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mod = 2*np.cos(pi*X/si[0]) + 2*np.cos(pi*Y/si[1]) - 4
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modi = 2*np.cos(pi*X/si[0]) + 2*np.cos(pi*Y/si[1]) - 4
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modi[math.floor(si[0]/2), math.floor(si[1]/2)] = 1
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else:
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[X, Y, T] = np.mgrid[-si[0]/2:si[0]/2, -si[1]/2:si[1]/2, -si[3]/2:si[3]/2]
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ss = 4
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ts = 2
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mod = 2*np.cos(pi*X/si[0]) + 2*np.cos(pi*Y/si[1]) + ts*np.cos(pi*T/si[3]) - ss - ts
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modi = 2*np.cos(pi*X/si[0]) + 2*np.cos(pi*Y/si[1]) + ts*np.cos(pi*T/si[3]) - ss - ts
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modi[math.floor(si[0]/2), math.floor(si[1]/2), math.floor(si[3]/2)] = 1
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phiw = phiwin[:, :, 1, :]
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si = [si[0], si[1], si[3]]
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def lap(phi):
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'''computes laplacian with priorly defined stencil'''
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K = np.fft.fftshift(np.fft.fftn(np.fft.ifftshift(phi)))
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K = np.multiply(K, mod)
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return np.real(np.fft.fftshift(np.fft.ifftn(np.fft.ifftshift(K))))
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def ilap(phi):
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K = np.fft.fftshift(np.fft.fftn(np.fft.ifftshift(phi)))
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K = K / modi
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return np.real(np.fft.fftshift(np.fft.ifftn(np.fft.ifftshift(K))))
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lap_phiw = np.zeros(si)
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lap_phi_vec = np.zeros(si)
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phi_vec = np.zeros(si)
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nr = np.zeros(si)
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if nd == 3:
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for t in range(self.Lt):
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#compute Laplacian of the correct phase
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lap_phi_vec[:,:,t] = np.cos(phiw[:,:,t])*lap(np.sin(phiw[:,:,t])) - np.sin(phiw[:,:,t])*lap(np.cos(phiw[:,:,t]))
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lap_phiw[:, :, t] = lap(phiw[:, :, t])
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phi_vec[:, :, t] = ilap(lap_phi_vec[:, :, t] - lap_phiw[:, :, t])
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if nd == 4:
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lap_phiw = lap(phiw)
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lap_phi_vec = np.cos(phiw)*lap(np.sin(phiw)) - np.sin(phiw)*lap(np.cos(phiw))
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phi_vec = ilap(lap_phi_vec - lap_phiw)
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nr = np.round(phi_vec/(2*pi))
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nrout = np.zeros(phiwin.shape)
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nrout[:, :, 1, :] = nr
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print(np.count_nonzero(nr))
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u = self.make_aorta_mesh((phiwin + 2*pi*nrout)*self.venc/pi, False, False)
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return u
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if nd <=3:
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[X, Y, Z] = np.mgrid[-si[0]/2:si[0]/2, -si[1]/2:si[1]/2, -si[2]/2:si[2]/2]
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ss = 6
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mod = 2*np.cos(pi*X/si[0]) + 2*np.cos(pi*Y/si[1]) - ss + 2*np.cos(pi*Z/si[2])
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modi = 2*np.cos(pi*X/si[0]) + 2*np.cos(pi*Y/si[1]) - ss + 2*np.cos(pi*Z/si[2])
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modi[math.floor(si[0]/2), math.floor(si[1]/2), math.floor(si[2]/2)] = 1
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def lap(phi):
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'''computes laplacian with priorly defined stencil'''
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K = np.fft.fftshift(np.fft.fftn(np.fft.ifftshift(phi)))
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K = np.multiply(K, mod)
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return np.real(np.fft.fftshift(np.fft.ifftn(np.fft.ifftshift(K))))
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def ilap(phi):
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K = np.fft.fftshift(np.fft.fftn(np.fft.ifftshift(phi)))
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K = K / modi
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return np.real(np.fft.fftshift(np.fft.ifftn(np.fft.ifftshift(K))))
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lap_phiw = np.zeros(si)
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lap_phi_vec = np.zeros(si)
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phi_vec = np.zeros(si)
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nr = np.zeros(si)
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for t in range(self.Lt):
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#compute Laplacian of the correct phase
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lap_phi_vec[:,:,:,t] = np.cos(phiw[:,:,:,t])*lap(np.sin(phiw[:,:,:,t])) - np.sin(phiw[:,:,:,t])*lap(np.cos(phiw[:,:,:,t]))
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lap_phiw[:, :, :, t] = lap(phiw[:, :, :, t])
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phi_vec[:, :, :, t] = ilap(lap_phi_vec[:, :, :, t] - lap_phiw[:, :, :, t])
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nr = np.round(phi_vec/(2*pi))
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nrout = np.zeros(phiwin.shape)
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nrout = nr
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print(np.count_nonzero(nr))
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if nd == 3:
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u = self.make_aorta_mesh((phiwin + 2*pi*nrout)*self.venc/pi, False, False)
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return u
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else:
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#define boundary conditions
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if self.mesh_type == 'slice':
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lap_phi_out = np.zeros(phiwin.shape)
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lap_phi_out[:,:,1,:] = lap_phi_vec[:,:,0,:]
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lap_phiw_out = np.zeros(phiwin.shape)
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lap_phiw_out[:,:,1,:] = lap_phiw[:,:,0,:]
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else:
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lap_phi_out = lap_phi_vec
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lap_phiw_out = lap_phiw
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lap_phi = self.make_aorta_mesh(lap_phi_out, False, False)
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phi_w= self.make_aorta_mesh(phiwin, False, False)
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lap_phi_w = self.make_aorta_mesh(lap_phiw_out, False, False)
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u = [Function(self.V) for i in range(self.Lt)]
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def boundary_D(x, on_boundary):
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return on_boundary
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for t in range(self.Lt):
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if self.mesh_type == 'aorta':
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bc_phi = DirichletBC(self.V, phi_w[t], self.bnds, 1)
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else:
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bc_phi = DirichletBC(self.V, phi_w[t], boundary_D)
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#bc_phi = DirichletBC(self.V, Constant(0.0), self.bnds, 1)
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ds = Measure("ds", subdomain_data=self.bnds)
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g_phi = Constant(0.0)
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phi = TrialFunction(self.V)
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v = TestFunction(self.V)
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a = dot(grad(phi), grad(v))*dx
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#L = (lap_phi[t] - lap_phi_w[t])*v*dx + g_phi*v*ds
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L = lap_phi[t]*v*dx
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phi = Function(self.V)
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solve(a == L, phi, bc_phi)
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nr = Function(self.V)
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nr.vector()[:] = np.round((phi.vector()[:])/(2*pi))
|
||||
#u[t].assign(phi_w[t]*self.venc/pi + nr*2*self.venc)
|
||||
u[t].assign(phi*self.venc/pi)
|
||||
return u
|
||||
if nd == 4:
|
||||
[X, Y, Z, T] = np.mgrid[-si[0]/2:si[0]/2, -si[1]/2:si[1]/2, -si[2]/2:si[2]/2, -si[3]/2:si[3]/2]
|
||||
ts = 2
|
||||
ss = 6
|
||||
if self.mesh_type == 'slice':
|
||||
ss = 4
|
||||
mod = 2*np.cos(pi*X/si[0]) + 2*np.cos(pi*Y/si[1]) + 2*np.cos(pi*Z/si[2]) + ts*np.cos(pi*T/si[3]) - ss - ts
|
||||
modi = 2*np.cos(pi*X/si[0]) + 2*np.cos(pi*Y/si[1]) + 2*np.cos(pi*Z/si[2]) + ts*np.cos(pi*T/si[3]) - ss - ts
|
||||
modi[math.floor(si[0]/2), math.floor(si[1]/2), math.floor(si[2]/2), math.floor(si[3]/2)] = 1
|
||||
def lap(phi):
|
||||
'''computes laplacian with priorly defined stencil'''
|
||||
K = np.fft.fftshift(np.fft.fftn(np.fft.ifftshift(phi)))
|
||||
K = np.multiply(K, mod)
|
||||
return np.real(np.fft.fftshift(np.fft.ifftn(np.fft.ifftshift(K))))
|
||||
def ilap(phi):
|
||||
K = np.fft.fftshift(np.fft.fftn(np.fft.ifftshift(phi)))
|
||||
K = K / modi
|
||||
return np.real(np.fft.fftshift(np.fft.ifftn(np.fft.ifftshift(K))))
|
||||
lap_phiw = lap(phiw)
|
||||
lap_phi_vec = np.cos(phiw)*lap(np.sin(phiw)) - np.sin(phiw)*lap(np.cos(phiw))
|
||||
phi_vec = ilap(lap_phi_vec - lap_phiw)
|
||||
nr = np.round(phi_vec/(2*pi))
|
||||
nrout = nr
|
||||
print(np.count_nonzero(nr))
|
||||
u = self.make_aorta_mesh((phiwin + 2*pi*nrout)*self.venc/pi, False, False)
|
||||
return u
|
||||
|
||||
def temporal_unwrap(self, phi_w):
|
||||
'''
|
||||
unwrapping with the temporal method described in Xiang, 1995
|
||||
Args (list): wrapped phase
|
||||
Return (list): unwrapped phase
|
||||
'''
|
||||
def wrap(u):
|
||||
''' wraps all values of u into the interval (-pi, pi)'''
|
||||
u_array = u.vector()[:]
|
||||
for i, x in enumerate(u_array):
|
||||
while x<-pi or x>pi:
|
||||
if x>pi:
|
||||
u_array[i] = x - 2*pi
|
||||
x = x - 2*pi
|
||||
if x<-pi:
|
||||
u_array[i] = x + 2*pi
|
||||
x = x + 2*pi
|
||||
u.vector()[:] = u_array
|
||||
return u
|
||||
phi_diff = [Function(self.V) for i in range(len(phi_w))]
|
||||
phi = [Function(self.V) for i in range(len(phi_w))]
|
||||
phi[self.t_ref] = phi_w[self.t_ref]
|
||||
for t in range(self.t_ref, len(phi_w)-1):
|
||||
phi_diff[t].vector()[:] = phi_w[t+1].vector()[:] - phi_w[t].vector()[:]
|
||||
phi_diff[t] = wrap(phi_diff[t])
|
||||
phi[t+1] = phi[t] + phi_diff[t]
|
||||
for t in reversed(range(0, self.t_ref)):
|
||||
phi_diff[t].vector()[:] = phi_w[t+1].vector()[:] - phi_w[t].vector()[:]
|
||||
phi_diff[t] = wrap(phi_diff[t])
|
||||
phi[t] = phi[t+1] - phi_diff[t]
|
||||
return phi
|
||||
|
||||
def probability_unwrap(self, phi_w):
|
||||
'''
|
||||
unwraps with probability-based method described in Loecher et al., 2011
|
||||
Args (list): wrapped phase
|
||||
Return (list): unwrapped phase
|
||||
'''
|
||||
timesteps = len(phi_w)
|
||||
if self.mesh_type == 'aorta':
|
||||
def prob_pass(phi_w, threshold, v_to_d, mesh, neighborhoods, w_s, w_t):
|
||||
'''
|
||||
performs one single pass over all vertices, estimating probability that they're wrapped and unwrapping if necessary
|
||||
'''
|
||||
coords = mesh.coordinates()
|
||||
prob = [[0]*mesh.num_vertices() for i in range(timesteps+1)]
|
||||
phi = phi_w
|
||||
|
||||
for v in vertices(mesh):
|
||||
for t in range(0, timesteps):
|
||||
#sum the gradients of the neighbours
|
||||
grad_sum = 0
|
||||
dofs = v_to_d[v.index()]
|
||||
value = phi_w[t].vector()[dofs]
|
||||
for idx in neighborhoods[v.index()]:
|
||||
grad_sum = grad_sum + w_s * (phi_w[t](coords[idx]) - value)
|
||||
if t>0:
|
||||
grad_sum = grad_sum + w_t*(phi_w[t-1].vector()[dofs] - value)
|
||||
if t < timesteps-1:
|
||||
grad_sum = grad_sum + w_t*(phi_w[t+1].vector()[dofs] - value)
|
||||
#calculate probability
|
||||
tot = max(0.000001, w_s*len(neighborhoods[v.index()]) + w_t*int(t>0) + w_t*int(t<timesteps+1))
|
||||
prob[t][v.index()] = grad_sum/(2*pi*tot)
|
||||
if prob[t][v.index()] > threshold:
|
||||
phi[t].vector()[dofs] = phi_w[t].vector()[dofs] + 2*pi
|
||||
if prob[t][v.index()] < -threshold:
|
||||
phi[t].vector()[dofs] = phi_w[t].vector()[dofs] - 2*pi
|
||||
return phi
|
||||
|
||||
#prepare vertex-dof maps
|
||||
v_to_d=vertex_to_dof_map(self.V)
|
||||
|
||||
#find all neighborhood vertices
|
||||
neighborhoods = [0]*self.mesh.num_vertices()
|
||||
for v in vertices(self.mesh):
|
||||
neighborhood = [Edge(self.mesh, i).entities(0) for i in v.entities(1)]
|
||||
neighborhood = np.array(neighborhood).flatten()
|
||||
neighborhood = neighborhood[np.where(neighborhood != v.index())[0]]
|
||||
neighborhoods[v.index()] = neighborhood
|
||||
|
||||
#low threshold passes
|
||||
phi = prob_pass(phi_w, self.t_low, v_to_d, self.mesh, neighborhoods, self.w_s, self.w_t)
|
||||
for i in range(self.n_low-1):
|
||||
phi = prob_pass(phi, self.t_low, v_to_d, self.mesh, neighborhoods, self.w_s, self.w_t)
|
||||
#high threshold passes
|
||||
for i in range(self.n_high):
|
||||
phi = prob_pass(phi, self.t_high, v_to_d, self.mesh, neighborhoods, self.w_s, self.w_t)
|
||||
return phi
|
||||
else:
|
||||
phiw = self.make_numpy_box(phi_w, False, False)
|
||||
si = phiw.shape
|
||||
def prob_pass(phiw, threshold, w_s, w_t):
|
||||
phi = np.copy(phiw)
|
||||
pw = 0
|
||||
for x in range(si[0]):
|
||||
for y in range(si[1]):
|
||||
for z in range(si[2]):
|
||||
for t in range(si[3]):
|
||||
grad_sum = 0
|
||||
val = phiw[x, y, z, t]
|
||||
tot = 0
|
||||
if 0<x:
|
||||
grad_sum += w_s*(phiw[x-1, y, z, t] - val)
|
||||
tot +=w_s
|
||||
if x<si[0]-1:
|
||||
grad_sum += w_s*(phiw[x+1, y, z, t] - val)
|
||||
tot +=w_s
|
||||
if 0<y:
|
||||
grad_sum += w_s*(phiw[x, y-1, z, t] - val)
|
||||
tot +=w_s
|
||||
if y<si[1]-1:
|
||||
grad_sum += w_s*(phiw[x, y+1, z, t] - val)
|
||||
tot +=w_s
|
||||
if 0<z:
|
||||
grad_sum += w_s*(phiw[x, y, z-1, t] - val)
|
||||
tot +=w_s
|
||||
if z<si[2]-1:
|
||||
grad_sum += w_s*(phiw[x, y, z+1, t] - val)
|
||||
tot +=w_s
|
||||
if 0<t:
|
||||
grad_sum += w_t*(phiw[x, y, z, t-1] - val)
|
||||
tot +=w_t
|
||||
if t<si[3]-1:
|
||||
grad_sum += w_t*(phiw[x, y, z, t+1] - val)
|
||||
tot +=w_t
|
||||
prob = grad_sum /(2*pi*tot)
|
||||
if prob > threshold:
|
||||
phi[x, y, z, t] = val + 2*pi
|
||||
pw +=1
|
||||
if prob < -threshold:
|
||||
phi[x, y, z, t] = val - 2*pi
|
||||
pw +=1
|
||||
print('wrapped pixels: ', pw)
|
||||
return phi
|
||||
|
||||
phi = prob_pass(phiw, self.t_low, self.w_s, self.w_t)
|
||||
for i in range(self.n_low - 1):
|
||||
phi = prob_pass(phi, self.t_low, self.w_s, self.w_t)
|
||||
for i in range(self.n_high):
|
||||
phi = prob_pass(phi, self.t_high, self.w_s, self.w_t)
|
||||
r_phi = self.make_aorta_mesh(phi, False, False)
|
||||
return r_phi
|
||||
|
||||
def dual_venc(self, high_venc_files, low_venc_files, addon = False):
|
||||
print('unwrapping with dual venc')
|
||||
if not addon:
|
||||
addon = self.path_addons['lee']
|
||||
#read files with low venc
|
||||
t = 0
|
||||
u = Function(self.V)
|
||||
low_venc = [Function(self.V) for i in range(len(low_venc_files))]
|
||||
for file in low_venc_files:
|
||||
h5u = HDF5File(self.mesh.mpi_comm(), file, 'r')
|
||||
h5u.read(u, 'u')
|
||||
low_venc[t].assign(u)
|
||||
t +=1
|
||||
#read files with high venc
|
||||
t = 0
|
||||
u = Function(self.V)
|
||||
high_venc = [Function(self.V) for i in range(len(high_venc_files))]
|
||||
for file in high_venc_files:
|
||||
if isinstance(file, str):
|
||||
h5u = HDF5File(self.mesh.mpi_comm(), file, 'r')
|
||||
h5u.read(u, 'u')
|
||||
high_venc[t].assign(u)
|
||||
else:
|
||||
high_venc[t].assign(file)
|
||||
t +=1
|
||||
self.Lt = len(low_venc_files)
|
||||
u = low_venc
|
||||
for t in range(self.Lt):
|
||||
diff = high_venc[t].vector()[:] - low_venc[t].vector()[:]
|
||||
n = np.round(diff/self.venc)
|
||||
u[t].vector()[:] += n*self.venc
|
||||
if self.save_xdmf:
|
||||
self.save(u, False, self.save_checkpoints, self.savepath + addon)
|
||||
return u
|
||||
|
||||
def omme(self, velocities, vencs):
|
||||
uw = Function(self.V)
|
||||
uw_vec = np.zeros(velocities[0].shape)
|
||||
#venc_uw = np.lcm.reduce(vencs)
|
||||
venc_uw = np.max(vencs)
|
||||
min_ind = np.argmin(vencs)
|
||||
min_venc = np.min(vencs)
|
||||
nb_samples = math.ceil(venc_uw/min_venc)+2
|
||||
range_u = np.arange(-nb_samples, nb_samples+1)*min_venc
|
||||
u = np.outer(velocities[min_ind][:],np.ones((1, len(range_u)))) + np.outer(np.ones((len(velocities[0][:]), 1)),range_u)
|
||||
for k in range(len(velocities[0])):
|
||||
J = 0
|
||||
u_k = u[k, abs(u[k,:]) <= venc_uw]
|
||||
for v_ind in range(len(vencs)):
|
||||
J = J - np.cos(np.pi * (velocities[v_ind][k] - u_k)/vencs[v_ind])
|
||||
ind_k = np.argmin(J)
|
||||
uw_vec[k] = u_k[ind_k]
|
||||
uw.vector()[:] = uw_vec
|
||||
return uw
|
||||
|
||||
def multi_venc(self, venc_files, vencs, addon = False):
|
||||
if not addon:
|
||||
addon = self.path_addons['omme']
|
||||
self.Lt = len(venc_files[0])
|
||||
print('unwrapping with %i vencs'%len(vencs))
|
||||
uw = []
|
||||
for t in range(self.Lt):
|
||||
velocities = []
|
||||
for filelist in venc_files:
|
||||
if isinstance(filelist[t], str):
|
||||
u = Function(self.V)
|
||||
h5u = HDF5File(self.mesh.mpi_comm(), filelist[t], 'r')
|
||||
h5u.read(u, 'u')
|
||||
velocities.append(u.vector()[:])
|
||||
else:
|
||||
velocities.append(filelist[t].vector()[:])
|
||||
uw.append(self.omme(velocities, vencs))
|
||||
if self.save_xdmf:
|
||||
self.save(uw, False, self.save_checkpoints, self.savepath + addon)
|
||||
print('done!')
|
||||
return uw
|
||||
|
||||
def unwrap(self, filelist, method = 'Temporal'):
|
||||
'''
|
||||
unwraps the velocity data :)
|
||||
Args (list/numpy array): filelist, list of files to unwrap OR one numpy array to unwrap
|
||||
Return (list): unwrapped velocity
|
||||
'''
|
||||
#get files from file list
|
||||
if isinstance(filelist, str) and (filelist.endswith('npy') or filelist.endswith('npz')):
|
||||
#using numpy array saves with default folder structure, ie all h5 files in one folder
|
||||
if filelist.endswith('npy'):
|
||||
u_in = np.load(filelist)
|
||||
if filelist.endswith('npz'):
|
||||
S = np.load(filelist)
|
||||
u_in = S['u']
|
||||
filelist = False
|
||||
self.Lt = u_in.shape[3]
|
||||
else:
|
||||
t = 0
|
||||
u = Function(self.V)
|
||||
u_in = [Function(self.V) for i in range(len(filelist))]
|
||||
for file in filelist:
|
||||
h5u = HDF5File(self.mesh.mpi_comm(), file, 'r')
|
||||
h5u.read(u, 'u')
|
||||
u_in[t].assign(u)
|
||||
t +=1
|
||||
self.Lt = len(filelist)
|
||||
if self.Lt == 0:
|
||||
raise Exception('No input files found!')
|
||||
if method.startswith('lap'):
|
||||
if type(u_in) == np.ndarray:
|
||||
vx = u_in
|
||||
else:
|
||||
print('transforming to numpy array')
|
||||
vx = self.make_numpy_box(u_in, save_numpy = False, save_box = False)
|
||||
#transform to phase
|
||||
print('unwrapping with laplacian method...')
|
||||
start_l = time.time()
|
||||
phase = np.asarray(vx * pi / self.venc)
|
||||
if method.endswith('3d'):
|
||||
u_list = self.lap_unwrap(phase, nd=3)
|
||||
if method.endswith('4d'):
|
||||
u_list = self.lap_unwrap(phase, nd=4)
|
||||
if method.endswith('fenics'):
|
||||
u_list = self.lap_unwrap(phase, nd=0)
|
||||
end_l = time.time()
|
||||
print('done!')
|
||||
print('total time for Laplacian: ' + str(end_l - start_l))
|
||||
if method == 'Temporal':
|
||||
if type(u_in) == np.ndarray:
|
||||
print('transforming to aorta mesh')
|
||||
u_wrapped = self.make_aorta_mesh(u_in, save_aorta=False, save_box=False)
|
||||
else:
|
||||
u_wrapped = u_in
|
||||
print('unwrapping with temporal method...')
|
||||
phi_w = [Function(self.V) for i in range(len(u_wrapped))]
|
||||
u_list = [Function(self.V) for i in range(len(u_wrapped))]
|
||||
for t, u in enumerate(u_wrapped):
|
||||
phi_w[t].assign(u * pi / self.venc)
|
||||
phi = self.temporal_unwrap(phi_w)
|
||||
for t, phit in enumerate(phi):
|
||||
u_list[t].assign(phit * self.venc / pi)
|
||||
print('done!')
|
||||
if method == 'Probability':
|
||||
if type(u_in) == np.ndarray:
|
||||
print('transforming to aorta mesh')
|
||||
u_wrapped = self.make_aorta_mesh(u_in, save_aorta=False, save_box=False)
|
||||
else:
|
||||
u_wrapped = u_in
|
||||
print('unwrapping with probability method...')
|
||||
phi_w = [Function(self.V) for i in range(len(u_wrapped))]
|
||||
u_list = [Function(self.V) for i in range(len(u_wrapped))]
|
||||
for t, u in enumerate(u_wrapped):
|
||||
phi_w[t].assign(u_wrapped[t] * pi/ self.venc)
|
||||
phi = self.probability_unwrap(phi_w)
|
||||
for t, phit in enumerate(phi):
|
||||
u_list[t].assign(phit * self.venc / pi)
|
||||
print('done!')
|
||||
if self.save_xdmf:
|
||||
self.save(u_in, filelist, self.save_checkpoints, self.savepath + 'wrapped/')
|
||||
self.save(u_list, filelist, self.save_checkpoints, self.savepath + self.path_addons[method])
|
||||
return u_list
|
||||
|
||||
def get_lumen(self, ground_truth):
|
||||
#separate only lumen voxels here
|
||||
lumen_indxs = []
|
||||
for k in range(len(ground_truth[0].vector()[:])):
|
||||
for t in range(self.Lt):
|
||||
#not-lumen voxels should always be zero in ground truth
|
||||
if ground_truth[t].vector()[k] != 0:
|
||||
lumen_indxs.append(k)
|
||||
break
|
||||
self.lumen_indxs = lumen_indxs
|
||||
return lumen_indxs
|
||||
|
||||
def eval(self, wrapped, ground_truth, method = 'error'):
|
||||
lumen_indxs = getattr(self, 'lumen_indxs', range(len(ground_truth[0].vector()[:])))
|
||||
if method == 'number':
|
||||
n = 0
|
||||
for t in range(self.Lt):
|
||||
for k in lumen_indxs:
|
||||
if abs(wrapped[t].vector()[k] - ground_truth[t].vector()[k]) > 0.1:
|
||||
n += 1
|
||||
print('number of wraps: ', n)
|
||||
print('percentage of wraps:', n / (self.Lt * len(lumen_indxs)) * 100)
|
||||
return n
|
||||
if method == 'error':
|
||||
#concatenate all timesteps together
|
||||
length = len(ground_truth[0].vector()[lumen_indxs])
|
||||
ground = np.zeros((self.Lt*length))
|
||||
u = np.zeros((self.Lt*length))
|
||||
for t in range(self.Lt):
|
||||
ground[t*length:(t+1)*length] = ground_truth[t].vector()[lumen_indxs]
|
||||
u[t*length:(t+1)*length] = wrapped[t].vector()[lumen_indxs]
|
||||
#compute norms
|
||||
error = np.linalg.norm(u-ground)/np.linalg.norm(ground)
|
||||
print('error: ', error)
|
||||
return error
|
||||
return 0
|
||||
Reference in New Issue
Block a user