def test_calc_angle_between_vectors():
assert calc_angle_between_vectors.run([1.0, 0.0, 0.0],
[0.0, 0.0, 1.0]) == 90.0
assert calc_angle_between_vectors.run([2.0, 1.0, 3.0],
[-2.0, -1.0, -3.0]) == 180.0
assert calc_angle_between_vectors.run([-2.0, -1.0, -3.0],
[2.0, 1.0, 3.0]) == 180.0
def run(working_pixel_value, sample_normal, source, vector_origin_to_pixels):
import calc_angle_between_vectors
import numpy as np
print "Compensate for sample attenuation..."
source_normal_angle = calc_angle_between_vectors.run(
source, sample_normal)
source_origin_incident_angle = 90.0 - source_normal_angle
incident_angle_term = 1.0/np.sin(np.deg2rad(source_origin_incident_angle))
normal_angle_term = 1.0/np.sin(np.deg2rad(90.0))
working_height, working_width = np.shape(working_pixel_value)
corrected_pixel_value = np.zeros((working_height, working_width))
sample_correction_factor = np.zeros((working_height, working_width))
for i in range(working_height):
for j in range(working_width):
current_vector_origin_pixel = vector_origin_to_pixels[(i * working_width) + j]
if current_vector_origin_pixel is int(0):
correction_factor = 0
sample_correction_factor[i][j] = correction_factor
corrected_pixel_value[i][j] = working_pixel_value[i][j] * correction_factor
else:
angle_normal_origin_pixel_deg = abs(calc_angle_between_vectors.run(current_vector_origin_pixel, sample_normal))
diffraction_angle = 90.0 - angle_normal_origin_pixel_deg
diffraction_angle_term = 1.0/np.sin(np.deg2rad(diffraction_angle))
ratio_diffracted_ray_over_normal_ray = (normal_angle_term + incident_angle_term) / (diffraction_angle_term + incident_angle_term)
sample_correction_factor[i][j] = 1.0 / ratio_diffracted_ray_over_normal_ray
corrected_pixel_value[i][j] = working_pixel_value[i][j] * sample_correction_factor[i][j]
if sample_correction_factor[i][j] < 0.0:
print "#### WARNING: NEGATIVE SAMPLE ATTENUATION CORRECTION FACTOR ####"
return corrected_pixel_value, sample_correction_factor
def run(width, height, pix, phi_limit, gsqr_limit, wavelength, a_lattice,
normal, norm_view_x, norm_view_y, central_pixel, width_mm_per_pixel,
height_mm_per_pixel, vector_origin_to_central_pixel,
unit_vector_source_to_origin, adjust_to_centre_of_pixel,
phi0_plane_normal):
import give_gsqr_value
import calc_plane_from_two_vectors
import calc_angle_between_vectors
print "Calculating gsqr and phi for each pixel..."
filter_angles_list_deg = []
thomson_angles_list_deg = []
gsqr = []
pixel_value = []
phi = []
for i in range(width):
for j in range(height):
current_pixel_value = pix[i, j]
current_gsqr, vector_origin_to_current_pixel = give_gsqr_value.run(
i, j, wavelength, a_lattice, normal, norm_view_x, norm_view_y,
central_pixel, width_mm_per_pixel, height_mm_per_pixel,
vector_origin_to_central_pixel, unit_vector_source_to_origin,
adjust_to_centre_of_pixel, width, height)
current_normal_to_plane = calc_plane_from_two_vectors.run(
vector_origin_to_current_pixel, [0.0, 0.0, 1.0])
current_phi_deg = calc_angle_between_vectors.run(
current_normal_to_plane, phi0_plane_normal)
current_filter_angle_deg = calc_angle_between_vectors.run(
vector_origin_to_current_pixel, normal)
current_thomson_angle_deg = calc_angle_between_vectors.run(
vector_origin_to_current_pixel, unit_vector_source_to_origin)
if current_phi_deg >= phi_limit[0] and current_phi_deg <= phi_limit[
1] and current_gsqr >= gsqr_limit[
0] and current_gsqr <= gsqr_limit[
1]: # Enforces the phi and gsqr limits.
filter_angles_list_deg.append(abs(current_filter_angle_deg))
thomson_angles_list_deg.append(abs(current_thomson_angle_deg))
gsqr.append(current_gsqr)
phi.append(current_phi_deg)
pixel_value.append(current_pixel_value)
else:
continue
return filter_angles_list_deg, thomson_angles_list_deg, gsqr, pixel_value, phi
def run(source_origin_pixel_angle_list_deg, pixel_value, source,
sample_normal):
import calc_angle_between_vectors
import numpy as np
# This function will correct the intensity of each pixel, since the x-rays are attenuated by travelling through the
# diffracting sample. This means that there will be an angular dependence on the correction to each pixel.
print "Compensating for sample attenuation..."
new_pixel_value = []
correction_factor_list = []
source_normal_angle = calc_angle_between_vectors.run(source, sample_normal)
source_origin_incident_angle = 90.0 - source_normal_angle
for i in range(len(source_origin_pixel_angle_list_deg)):
current_pixel_value = pixel_value[i]
current_source_origin_pixel_angle = source_origin_pixel_angle_list_deg[
i]
sample_pixel_diffraction_angle_deg = 180.0 - current_source_origin_pixel_angle - source_origin_incident_angle
sample_pixel_diffraction_angle_rad = np.deg2rad(
sample_pixel_diffraction_angle_deg)
source_origin_incident_angle_rad = np.deg2rad(
source_origin_incident_angle)
# The following are used to calculate the correction factor due to sample absorption.
diffraction_angle_term = (1 /
np.sin(sample_pixel_diffraction_angle_rad))
incident_angle_term = (1 / np.sin(source_origin_incident_angle_rad))
complete_angle_term = diffraction_angle_term + incident_angle_term
# The following term is the factor which, when multiplied by the source intensity, will give us the intensity
# at the point of detection.
sample_absorption_term = 1.0 / complete_angle_term
# Since we are trying to correct for attenuation, we multiply the pixel intensity by the
# inverse of the absorption term so as to simulate the intensity as if the sample were not
# attenuating the diffraction signal.
current_correction_factor = 1.0 / sample_absorption_term
current_pixel_value = current_pixel_value * current_correction_factor
new_pixel_value.append(current_pixel_value)
correction_factor_list.append(current_correction_factor)
return new_pixel_value, correction_factor_list
def run(vector_origin_pixel, unit_phi_plane_normal, phi_0_vector):
import numpy as np
import calc_angle_between_vectors
import give_phi_sign
# First collapse the vector_origin_pixel onto the phi_0_plane:
length_vector_origin_pixel = np.linalg.norm(vector_origin_pixel)
unit_vector_origin_pixel = vector_origin_pixel / length_vector_origin_pixel
parallel_component_origin_pixel = unit_phi_plane_normal * np.dot(
unit_vector_origin_pixel, unit_phi_plane_normal)
origin_pixel_vector_in_plane = unit_vector_origin_pixel - parallel_component_origin_pixel
# Then calculate the angle between these vectors:
phi_deg = calc_angle_between_vectors.run(origin_pixel_vector_in_plane,
phi_0_vector)
phi_deg = give_phi_sign.run(phi_deg, phi_0_vector,
origin_pixel_vector_in_plane,
unit_phi_plane_normal)
return phi_deg
if ip.debug == True: print "\n###### COLUMN " + str(i) + " ############"
for j in range(height):
current_pixel_value = pix[i, j]
current_gsqr, vector_origin_to_current_pixel = give_gsqr_value.run(
i, j, ip.wavelength, ip.a_lattice, ip.normal, norm_view_x,
norm_view_y, central_pixel, width_mm_per_pixel,
height_mm_per_pixel, vector_origin_to_central_pixel,
unit_vector_source_to_origin, adjust_to_centre_of_pixel, width,
height)
current_normal_to_plane = calc_plane_from_two_vectors.run(
vector_origin_to_current_pixel, [0.0, 0.0, 1.0])
current_phi_deg = calc_angle_between_vectors.run(
current_normal_to_plane, phi0_plane_normal)
current_filter_angle_deg = calc_angle_between_vectors.run(
vector_origin_to_current_pixel, ip.normal)
if current_phi_deg >= ip.phi_limit[
0] and current_phi_deg <= ip.phi_limit[
1]: # Enforces the phi limits.
filter_angles_list_deg.append(abs(current_filter_angle_deg))
gsqr.append(current_gsqr)
phi.append(current_phi_deg)
pixel_value.append(current_pixel_value)
else:
continue
def run(working_height, working_width, wavelength, a_lattice, norm_view_x,
norm_view_y, central_point, width_mm_per_pixel, height_mm_per_pixel,
vector_origin_to_central_point, unit_vector_source_to_origin,
adjust_to_centre_of_pixel, phi_plane_normal, normal, filter_angles_deg,
gsqr, phi, vector_origin_to_pixels, polarisation_angles_deg,
phi0_vector, bragg_angles_deg):
import calc_angle_between_vectors
import find_vector_component_in_phi_plane
import numpy as np
for i in range(working_height):
for j in range(working_width):
# numpy arrays have shape = (working_height, working_width)
current_pixel = [i, j]
pixel_difference = [0, 0]
pixel_difference[0] = -(current_pixel[0] - central_point[0])
pixel_difference[1] = current_pixel[1] - central_point[1]
mm_difference = [
pixel_difference[0] * height_mm_per_pixel,
pixel_difference[1] * width_mm_per_pixel
]
mm_difference_centre_to_current = [
mm_difference[0] * norm_view_y, mm_difference[1] * norm_view_x
]
vector_origin_to_current_pixel_top_left = vector_origin_to_central_point + mm_difference_centre_to_current[0] + \
mm_difference_centre_to_current[1]
vector_origin_to_current_pixel_centre = vector_origin_to_current_pixel_top_left + \
adjust_to_centre_of_pixel[0] + adjust_to_centre_of_pixel[1]
distance_origin_to_current_pixel_centre = np.linalg.norm(
vector_origin_to_current_pixel_centre)
unit_vector_origin_to_current_pixel_centre = vector_origin_to_current_pixel_centre / distance_origin_to_current_pixel_centre
g = (unit_vector_origin_to_current_pixel_centre -
unit_vector_source_to_origin) * (1 / wavelength)
g = np.linalg.norm(g) / (1.0 / a_lattice)
current_gsqr = g**2
unit_vector_component_in_phi_plane = find_vector_component_in_phi_plane.run(
vector_origin_to_current_pixel_centre, phi_plane_normal)
current_bragg_angle = 0.5 * abs(
calc_angle_between_vectors.run(
unit_vector_source_to_origin,
unit_vector_origin_to_current_pixel_centre))
current_phi_deg = calc_angle_between_vectors.run(
unit_vector_component_in_phi_plane, phi0_vector)
current_filter_angle_deg = calc_angle_between_vectors.run(
vector_origin_to_current_pixel_centre, normal)
current_polarisation_angle = abs(
calc_angle_between_vectors.run(
unit_vector_source_to_origin,
vector_origin_to_current_pixel_centre))
if current_polarisation_angle > 90.0:
# This corrects for the case where the polarisation angle > 90.0. This angle should have a maximum value
# of 90.0.
current_polarisation_angle = 90.0 - abs(
current_polarisation_angle - 90.0)
filter_angles_deg[i][j] = abs(current_filter_angle_deg)
gsqr[i][j] = current_gsqr
phi[i][j] = current_phi_deg
vector_origin_to_pixels[(i * working_width) +
j] = vector_origin_to_current_pixel_centre
polarisation_angles_deg[i][j] = abs(current_polarisation_angle)
bragg_angles_deg[i][j] = current_bragg_angle
return filter_angles_deg, gsqr, phi, vector_origin_to_pixels, polarisation_angles_deg, bragg_angles_deg
def run(width, height, pix, phi_limit, gsqr_limit, wavelength, a_lattice,
normal, norm_view_x, norm_view_y, central_pixel, width_mm_per_pixel,
height_mm_per_pixel, vector_origin_to_central_pixel,
unit_vector_source_to_origin, adjust_to_centre_of_pixel,
phi_0_plane_normal, phi_0_vector, debug):
import give_gsqr_value
import calc_angle_between_vectors
import calc_phi_deg
print "Calculating gsqr and phi for each pixel..."
# This first set of lists is used to hold all of the values that fit within our phi and gsqr limits. These will \
# later be used for the other calculations in the code.
filter_angles_list_deg = []
thomson_angles_list_deg = []
gsqr = []
pixel_value = []
phi = []
# This second set of list holds ALL of the values for every pixel; no pixel's values are filtered out including
# those that exist outside of out phi and gsqr limits. These are only used to make the mask images of the
# attenuation corrections.
complete_filter_angles_list_deg = []
complete_thomson_angles_list_deg = []
complete_gsqr = []
complete_pixel_value = []
complete_phi = []
for i in range(width):
for j in range(height):
current_pixel_value = pix[i, j]
current_gsqr, vector_origin_to_current_pixel = give_gsqr_value.run(
i, j, wavelength, a_lattice, norm_view_x, norm_view_y,
central_pixel, width_mm_per_pixel, height_mm_per_pixel,
vector_origin_to_central_pixel, unit_vector_source_to_origin,
adjust_to_centre_of_pixel, width, height)
current_phi_deg = calc_phi_deg.run(vector_origin_to_current_pixel,
phi_0_plane_normal,
phi_0_vector)
current_filter_angle_deg = calc_angle_between_vectors.run(
vector_origin_to_current_pixel, normal)
current_thomson_angle_deg = calc_angle_between_vectors.run(
vector_origin_to_current_pixel, unit_vector_source_to_origin)
complete_filter_angles_list_deg.append(
abs(current_filter_angle_deg))
complete_thomson_angles_list_deg.append(
abs(current_thomson_angle_deg))
complete_gsqr.append(current_gsqr)
complete_phi.append(current_phi_deg)
complete_pixel_value.append(current_pixel_value)
if phi_limit[0] <= current_phi_deg <= phi_limit[1] and gsqr_limit[
0] <= current_gsqr <= gsqr_limit[1]:
filter_angles_list_deg.append(abs(current_filter_angle_deg))
thomson_angles_list_deg.append(abs(current_thomson_angle_deg))
gsqr.append(current_gsqr)
phi.append(current_phi_deg)
pixel_value.append(current_pixel_value)
else:
continue
debug_message = (
"\n\n~~~~~~~~~~~~~\nFILENAME = " + __name__ + ".py" + "\n\nINPUTS:" +
"\nworking_width = " + str(width) + "\nworking_height = " +
str(height) + "\npix = " + str(pix) + "\nphi_limit = " +
str(phi_limit) + "\ngsqr_limit = " + str(gsqr_limit) +
"\nwavelength = " + str(wavelength) + "\na_lattice = " +
str(a_lattice) + "\nnormal = " + str(normal) + "\nnorm_view_x = " +
str(norm_view_x) + "\nnorm_view_y = " + str(norm_view_y) +
"\ncentral_pixel = " + str(central_pixel) + "\nwidth_mm_per_pixel = " +
str(width_mm_per_pixel) + "\nheight_mm_per_pixel = " +
str(height_mm_per_pixel) + "\nvector_origin_to_central_pixel = " +
str(vector_origin_to_central_pixel) +
"\nunit_vector_source_to_origin = " +
str(unit_vector_source_to_origin) + "\nadjust_to_centre_of_pixel = " +
str(adjust_to_centre_of_pixel) + "\nphi_0_plane_normal = " +
str(phi_0_plane_normal) + "\nphi_0_vector = " + str(phi_0_vector) +
"\ndebug = " + str(debug) + "\n\nOUTPUTS:" + "\nfilter_angles_deg = " +
str(filter_angles_list_deg) + "\nthomson_angles_list_deg = " +
str(thomson_angles_list_deg) + "\ngsqr = " + str(gsqr) +
"\nraw_pixel_value = " + str(pixel_value) + "\nphi = " + str(phi) +
"\n~~~~~~~~~~~~~~~")
if debug:
print debug_message
return filter_angles_list_deg, thomson_angles_list_deg, gsqr, pixel_value, phi, complete_filter_angles_list_deg, \
complete_thomson_angles_list_deg, complete_gsqr, complete_pixel_value, complete_phi
def run(width, height, pix, phi_limit, gsqr_limit, wavelength, a_lattice,
normal, norm_view_x, norm_view_y, central_pixel, width_mm_per_pixel,
height_mm_per_pixel, vector_origin_to_central_pixel,
unit_vector_source_to_origin, adjust_to_centre_of_pixel,
phi_0_plane_normal, phi_0_vector, debug):
import give_gsqr_value
import calc_angle_between_vectors
import calc_phi_deg
print "Calculating gsqr and phi for each pixel..."
filter_angles_list_deg = []
thomson_angles_list_deg = []
gsqr = []
pixel_value = []
phi = []
for i in range(width):
for j in range(height):
current_pixel_value = pix[i, j]
current_gsqr, vector_origin_to_current_pixel = give_gsqr_value.run(
i, j, wavelength, a_lattice, norm_view_x, norm_view_y,
central_pixel, width_mm_per_pixel, height_mm_per_pixel,
vector_origin_to_central_pixel, unit_vector_source_to_origin,
adjust_to_centre_of_pixel, width, height)
current_phi_deg = calc_phi_deg.run(vector_origin_to_current_pixel,
phi_0_plane_normal,
phi_0_vector)
current_filter_angle_deg = calc_angle_between_vectors.run(
vector_origin_to_current_pixel, normal)
current_thomson_angle_deg = calc_angle_between_vectors.run(
vector_origin_to_current_pixel, unit_vector_source_to_origin)
if phi_limit[0] <= current_phi_deg <= phi_limit[1] and gsqr_limit[
0] <= current_gsqr <= gsqr_limit[1]:
filter_angles_list_deg.append(abs(current_filter_angle_deg))
thomson_angles_list_deg.append(abs(current_thomson_angle_deg))
gsqr.append(current_gsqr)
phi.append(current_phi_deg)
pixel_value.append(current_pixel_value)
else:
continue
debug_message = (
"\n\n~~~~~~~~~~~~~\nFILENAME = " + __name__ + ".py" + "\n\nINPUTS:" +
"\nworking_width = " + str(width) + "\nworking_height = " +
str(height) + "\npix = " + str(pix) + "\nphi_limit = " +
str(phi_limit) + "\ngsqr_limit = " + str(gsqr_limit) +
"\nwavelength = " + str(wavelength) + "\na_lattice = " +
str(a_lattice) + "\nnormal = " + str(normal) + "\nnorm_view_x = " +
str(norm_view_x) + "\nnorm_view_y = " + str(norm_view_y) +
"\ncentral_pixel = " + str(central_pixel) + "\nwidth_mm_per_pixel = " +
str(width_mm_per_pixel) + "\nheight_mm_per_pixel = " +
str(height_mm_per_pixel) + "\nvector_origin_to_central_pixel = " +
str(vector_origin_to_central_pixel) +
"\nunit_vector_source_to_origin = " +
str(unit_vector_source_to_origin) + "\nadjust_to_centre_of_pixel = " +
str(adjust_to_centre_of_pixel) + "\nphi_0_plane_normal = " +
str(phi_0_plane_normal) + "\nphi_0_vector = " + str(phi_0_vector) +
"\ndebug = " + str(debug) + "\n\nOUTPUTS:" + "\nfilter_angles_deg = " +
str(filter_angles_list_deg) + "\nthomson_angles_list_deg = " +
str(thomson_angles_list_deg) + "\ngsqr = " + str(gsqr) +
"\nraw_pixel_value = " + str(pixel_value) + "\nphi = " + str(phi) +
"\n~~~~~~~~~~~~~~~")
if debug:
print debug_message
return filter_angles_list_deg, thomson_angles_list_deg, gsqr, pixel_value, phi
