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#!/usr/bin/env python
# coding: utf-8
# /*##########################################################################
#
# Copyright (c) 2016 European Synchrotron Radiation Facility
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
# ###########################################################################*/
"""Test of the forward projection module"""
from __future__ import division, print_function
__authors__ = ["Pierre paleo"]
__license__ = "MIT"
__copyright__ = "2013-2017 European Synchrotron Radiation Facility, Grenoble, France"
__date__ = "19/01/2018"
import time
import logging
import numpy as np
import unittest
try:
import mako
except ImportError:
mako = None
from ..common import ocl
if ocl:
from .. import projection
from silx.test.utils import utilstest
logger = logging.getLogger(__name__)
@unittest.skipUnless(ocl and mako, "PyOpenCl is missing")
class TestProj(unittest.TestCase):
def setUp(self):
if ocl is None:
return
# ~ if sys.platform.startswith('darwin'):
# ~ self.skipTest("Projection is not implemented on CPU for OS X yet")
self.getfiles()
n_angles = self.sino.shape[0]
self.proj = projection.Projection(self.phantom.shape, n_angles)
if self.proj.compiletime_workgroup_size < 16 * 16:
self.skipTest("Current implementation of OpenCL projection is not supported on this platform yet")
def tearDown(self):
self.phantom = None
self.sino = None
self.proj = None
def getfiles(self):
# load 512x512 MRI phantom
self.phantom = np.load(utilstest.getfile("Brain512.npz"))["data"]
# load sinogram computed with PyHST
self.sino = np.load(utilstest.getfile("sino500_pyhst.npz"))["data"]
def measure(self):
"Common measurement of timings"
t1 = time.time()
try:
result = self.proj.projection(self.phantom)
except RuntimeError as msg:
logger.error(msg)
return
t2 = time.time()
return t2 - t1, result
def compare(self, res):
"""
Compare a result with the reference reconstruction.
Only the valid reconstruction zone (inscribed circle) is taken into account
"""
# Compare with the original phantom.
# TODO: compare a standard projection
ref = self.sino
return np.max(np.abs(res - ref))
@unittest.skipUnless(ocl and mako, "pyopencl is missing")
def test_proj(self):
"""
tests Projection
"""
# Test single reconstruction
# --------------------------
t, res = self.measure()
if t is None:
logger.info("test_proj: skipped")
else:
logger.info("test_proj: time = %.3fs" % t)
err = self.compare(res)
msg = str("Max error = %e" % err)
logger.info(msg)
# Interpolation differs at some lines, giving relative error of 10/50000
self.assertTrue(err < 20., "Max error is too high")
# Test multiple reconstructions
# -----------------------------
res0 = np.copy(res)
for i in range(10):
res = self.proj.projection(self.phantom)
errmax = np.max(np.abs(res - res0))
self.assertTrue(errmax < 1.e-6, "Max error is too high")
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