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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#include "itkNiftiImageIOTest.h"
template <typename PixelType,unsigned TType>
int
SlopeInterceptTest()
{
//
// fill out a nifti image and write it.
const char *filename = "SlopeIntercept.nii";
nifti_image * niftiImage = nifti_simple_init_nim();
niftiImage->fname = (char *)malloc(strlen(filename)+1);
if(niftiImage->fname == ITK_NULLPTR)
{
std::cerr << "Failed to allocate memory for filename, length requested "
<< strlen(filename) + 1 << std::endl;
return EXIT_FAILURE;
}
strcpy(niftiImage->fname,filename);
niftiImage->nifti_type = 1;
niftiImage->iname = (char *)malloc(strlen(filename)+1);
if (niftiImage->iname == ITK_NULLPTR)
{
free(niftiImage->fname);
std::cerr << "Failed to allocate memory for filename, length requested "
<< strlen(filename) + 1 << std::endl;
return EXIT_FAILURE;
}
strcpy(niftiImage->iname,filename);
niftiImage->dim[0] =
niftiImage->ndim = 3;
niftiImage->nx = niftiImage->dim[1] = 8;
niftiImage->ny = niftiImage->dim[2] = 8;
niftiImage->nz = niftiImage->dim[3] = 4;
niftiImage->nvox = 256;
niftiImage->dx = niftiImage->pixdim[1] =
niftiImage->dy = niftiImage->pixdim[2] =
niftiImage->dz = niftiImage->pixdim[3] = 1.0;
niftiImage->nu = 1;
niftiImage->datatype = TType;
niftiImage->nbyper = sizeof(PixelType);
niftiImage->scl_slope = 1.0/256.0;
niftiImage->scl_inter = 0.0;
niftiImage->sform_code = NIFTI_XFORM_SCANNER_ANAT;
niftiImage->qform_code = NIFTI_XFORM_ALIGNED_ANAT;
niftiImage->qfac = 1;
mat44 matrix;
for(unsigned i = 0; i < 4; i++)
{
for(unsigned j = 0; j < 4; j++)
{
matrix.m[i][j] = (i == j) ? 1.0 : 0.0;
}
}
niftiImage->qto_xyz = matrix;
niftiImage->sto_xyz = matrix;
niftiImage->sto_ijk = matrix;
niftiImage->qto_ijk = matrix;
nifti_mat44_to_quatern(matrix,
&(niftiImage->quatern_b),
&(niftiImage->quatern_c),
&(niftiImage->quatern_d),
&(niftiImage->qoffset_x),
&(niftiImage->qoffset_y),
&(niftiImage->qoffset_z),
ITK_NULLPTR,
ITK_NULLPTR,
ITK_NULLPTR,
&(niftiImage->qfac));
niftiImage->data = malloc(sizeof(PixelType) * 256);
for(unsigned i = 0; i < 256; i++)
{
static_cast<PixelType *>(niftiImage->data)[i] = i;
}
nifti_image_write(niftiImage);
nifti_image_free(niftiImage);
//
// read the image back in
typedef typename itk::Image<float,3> ImageType;
typename ImageType::Pointer image;
try
{
image = itk::IOTestHelper::ReadImage<ImageType>(std::string(filename));
}
catch(...)
{
itk::IOTestHelper::Remove(filename);
return EXIT_FAILURE;
}
typedef typename itk::ImageRegionIterator<ImageType> IteratorType;
IteratorType it(image,image->GetLargestPossibleRegion());
it.GoToBegin();
double maxerror = 0.0;
for(unsigned i = 0; i < 256; i++,++it)
{
if(it.IsAtEnd())
{
return EXIT_FAILURE;
}
if(!Equal(it.Value(),static_cast<float>(i)/256.0))
{
// return EXIT_FAILURE;
double error = std::abs(it.Value() -
(static_cast<double>(i)/256.0));
if(error > maxerror)
{
maxerror = error;
}
}
}
std::cerr << "Max error " << maxerror << std::endl;
itk::IOTestHelper::Remove(filename);
return maxerror > 0.00001 ? EXIT_FAILURE : EXIT_SUCCESS;
}
//
// test vector images
int itkNiftiImageIOTest5(int ac, char* av[])
{
//
// first argument is passing in the writable directory to do all testing
if(ac > 1)
{
char *testdir = *++av;
itksys::SystemTools::ChangeDirectory(testdir);
}
else
{
return EXIT_FAILURE;
}
int success(0);
success |= SlopeInterceptTest<unsigned char,NIFTI_TYPE_UINT8>();
success |= SlopeInterceptTest<short,NIFTI_TYPE_INT16>();
success |= SlopeInterceptTest<unsigned short,NIFTI_TYPE_UINT16>();
success |= SlopeInterceptTest<int,NIFTI_TYPE_INT32>();
success |= SlopeInterceptTest<unsigned int,NIFTI_TYPE_UINT32>();
success |= SlopeInterceptTest<long long,NIFTI_TYPE_INT64>();
success |= SlopeInterceptTest<unsigned long long,NIFTI_TYPE_UINT64>();
return success;
}
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