# emacs: -*- mode: python-mode; py-indent-offset: 4; indent-tabs-mode: nil -*- # vi: set ft=python sts=4 ts=4 sw=4 et: ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ## # # See COPYING file distributed along with the NiBabel package for the # copyright and license terms. # ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ## from __future__ import with_statement import os import numpy as np from ..py3k import asbytes from ..volumeutils import native_code, swapped_code from ..ecat import EcatHeader, EcatMlist, EcatSubHeader, EcatImage from unittest import TestCase from nose.tools import (assert_true, assert_false, assert_equal, assert_not_equal, assert_raises) from numpy.testing import assert_array_equal, assert_array_almost_equal from ..testing import data_path from ..tmpdirs import InTemporaryDirectory ecat_file = os.path.join(data_path, 'tinypet.v') class TestEcatHeader(TestCase): header_class = EcatHeader example_file = ecat_file def test_header_size(self): assert_equal(self.header_class._dtype.itemsize, 512) def test_empty(self): hdr = self.header_class() assert_true(len(hdr.binaryblock) == 512) assert_true(hdr['magic_number'] == asbytes('MATRIX72')) assert_true(hdr['sw_version'] == 74) assert_true(hdr['num_frames'] == 0) assert_true(hdr['file_type'] == 0) assert_true(hdr['ecat_calibration_factor'] == 1.0) def test_dtype(self): #dtype not specified in header, only in subheaders hdr = self.header_class() assert_raises(NotImplementedError, hdr.get_data_dtype) def test_header_codes(self): fid = open(ecat_file, 'rb') hdr = self.header_class() newhdr = hdr.from_fileobj(fid) fid.close() assert_true(newhdr.get_filetype() == 'ECAT7_VOLUME16') assert_equal(newhdr.get_patient_orient(), 'ECAT7_Unknown_Orientation') def test_copy(self): hdr = self.header_class() hdr2 = hdr.copy() assert_true(hdr == hdr2) assert_true(not hdr.binaryblock == hdr2._header_data.byteswap().tostring()) assert_true(hdr.keys() == hdr2.keys()) def test_update(self): hdr = self.header_class() assert_true(hdr['num_frames'] == 0) hdr['num_frames'] = 2 assert_true(hdr['num_frames'] == 2) def test_endianness(self): # Default constructed header should be native native_hdr = self.header_class() assert_true(native_hdr.endianness == native_code) # Swapped constructed header should be swapped swapped_hdr = self.header_class(endianness=swapped_code) assert_true(swapped_hdr.endianness == swapped_code) # Example header is big-endian fid = open(ecat_file, 'rb') file_hdr = native_hdr.from_fileobj(fid) fid.close() assert_true(file_hdr.endianness == '>') class TestEcatMlist(TestCase): header_class = EcatHeader mlist_class = EcatMlist example_file = ecat_file def test_mlist(self): fid = open(self.example_file, 'rb') hdr = self.header_class.from_fileobj(fid) mlist = self.mlist_class(fid, hdr) fid.seek(0) fid.seek(512) dat=fid.read(128*32) dt = np.dtype([('matlist',np.int32)]) dt = dt.newbyteorder('>') mats = np.recarray(shape=(32,4), dtype=dt, buf=dat) fid.close() #tests assert_true(mats['matlist'][0,0] + mats['matlist'][0,3] == 31) assert_true(mlist.get_frame_order()[0][0] == 0) assert_true(mlist.get_frame_order()[0][1] == 16842758.0) # test badly ordered mlist badordermlist = mlist badordermlist._mlist = np.array([[ 1.68427540e+07, 3.00000000e+00, 1.20350000e+04, 1.00000000e+00], [ 1.68427530e+07, 1.20360000e+04, 2.40680000e+04, 1.00000000e+00], [ 1.68427550e+07, 2.40690000e+04, 3.61010000e+04, 1.00000000e+00], [ 1.68427560e+07, 3.61020000e+04, 4.81340000e+04, 1.00000000e+00], [ 1.68427570e+07, 4.81350000e+04, 6.01670000e+04, 1.00000000e+00], [ 1.68427580e+07, 6.01680000e+04, 7.22000000e+04, 1.00000000e+00]]) assert_true(badordermlist.get_frame_order()[0][0] == 1) def test_mlist_errors(self): fid = open(self.example_file, 'rb') hdr = self.header_class.from_fileobj(fid) hdr['num_frames'] = 6 mlist = self.mlist_class(fid, hdr) mlist._mlist = np.array([[ 1.68427540e+07, 3.00000000e+00, 1.20350000e+04, 1.00000000e+00], [ 1.68427530e+07, 1.20360000e+04, 2.40680000e+04, 1.00000000e+00], [ 1.68427550e+07, 2.40690000e+04, 3.61010000e+04, 1.00000000e+00], [ 1.68427560e+07, 3.61020000e+04, 4.81340000e+04, 1.00000000e+00], [ 1.68427570e+07, 4.81350000e+04, 6.01670000e+04, 1.00000000e+00], [ 1.68427580e+07, 6.01680000e+04, 7.22000000e+04, 1.00000000e+00]]) series_framenumbers = mlist.get_series_framenumbers() # first frame stored was actually 2nd frame acquired assert_true(series_framenumbers[0] == 2) order = [series_framenumbers[x] for x in sorted(series_framenumbers)] # true series order is [2,1,3,4,5,6], note counting starts at 1 assert_true(order == [2, 1, 3, 4, 5, 6]) mlist._mlist[0,0] = 0 frames_order = mlist.get_frame_order() neworder =[frames_order[x][0] for x in sorted(frames_order)] assert_true(neworder == [1, 2, 3, 4, 5]) assert_raises(IOError, mlist.get_series_framenumbers) class TestEcatSubHeader(TestCase): header_class = EcatHeader mlist_class = EcatMlist subhdr_class = EcatSubHeader example_file = ecat_file fid = open(example_file, 'rb') hdr = header_class.from_fileobj(fid) mlist = mlist_class(fid, hdr) subhdr = subhdr_class(hdr, mlist, fid) def test_subheader_size(self): assert_equal(self.subhdr_class._subhdrdtype.itemsize, 510) def test_subheader(self): assert_equal(self.subhdr.get_shape() , (10,10,3)) assert_equal(self.subhdr.get_nframes() , 1) assert_equal(self.subhdr.get_nframes(), len(self.subhdr.subheaders)) assert_equal(self.subhdr._check_affines(), True) assert_array_almost_equal(np.diag(self.subhdr.get_frame_affine()), np.array([ 2.20241979, 2.20241979, 3.125, 1.])) assert_equal(self.subhdr.get_zooms()[0], 2.20241978764534) assert_equal(self.subhdr.get_zooms()[2], 3.125) assert_equal(self.subhdr._get_data_dtype(0),np.uint16) #assert_equal(self.subhdr._get_frame_offset(), 1024) assert_equal(self.subhdr._get_frame_offset(), 1536) dat = self.subhdr.raw_data_from_fileobj() assert_equal(dat.shape, self.subhdr.get_shape()) scale_factor = self.subhdr.subheaders[0]['scale_factor'] assert_equal(self.subhdr.subheaders[0]['scale_factor'].item(),1.0) ecat_calib_factor = self.hdr['ecat_calibration_factor'] assert_equal(ecat_calib_factor, 25007614.0) class TestEcatImage(TestCase): image_class = EcatImage example_file = ecat_file img = image_class.load(example_file) def test_file(self): assert_equal(self.img.file_map['header'].filename, self.example_file) assert_equal(self.img.file_map['image'].filename, self.example_file) def test_save(self): tmp_file = 'tinypet_tmp.v' with InTemporaryDirectory(): self.img.to_filename(tmp_file) other = self.image_class.load(tmp_file) assert_equal(self.img.get_data().all(), other.get_data().all()) # Delete object holding reference to temporary file to make Windows # happier. del other def test_data(self): dat = self.img.get_data() assert_equal(dat.shape, self.img.shape) frame = self.img.get_frame(0) assert_array_equal(frame, dat[:,:,:,0]) def test_array_proxy(self): # Get the cached data copy dat = self.img.get_data() # Make a new one to test arrayproxy img = self.image_class.load(self.example_file) # Maybe we will promote _data to public, but I know this looks bad secret_data = img._data data2 = np.array(secret_data) assert_array_equal(data2, dat) # Check it rereads data3 = np.array(secret_data) assert_array_equal(data3, dat)