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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 <iostream>
#include "itkImage.h"
#include "itkRayCastInterpolateImageFunction.h"
#include "itkTranslationTransform.h"
#include "itkLinearInterpolateImageFunction.h"
#include "itkTestingMacros.h"
int
itkRayCastInterpolateImageFunctionTest(
int itkNotUsed(argc),
char * itkNotUsed(argv) [] )
{
std::cout << "Testing RayCastInterpolateImageFunction:\n";
typedef unsigned char PixelType;
const unsigned int ImageDimension = 3;
typedef itk::Image< PixelType, ImageDimension > ImageType;
typedef ImageType::IndexType IndexType;
typedef ImageType::PointType PointType;
typedef ImageType::SpacingType SpacingType;
typedef ImageType::SizeType SizeType;
typedef ImageType::RegionType RegionType;
/* Allocate a simple test image */
ImageType::Pointer image = ImageType::New();
IndexType start;
start.Fill(0);
SizeType size;
size[0] = 30;
size[1] = 30;
size[2] = 30;
RegionType region;
region.SetIndex(start);
region.SetSize(size);
image->SetRegions(region);
image->Allocate();
PointType origin;
origin.Fill(0.0);
SpacingType spacing;
spacing.Fill(1.0);
/* Set origin and spacing of physical coordinates */
image->SetOrigin(origin);
image->SetSpacing(spacing);
/* Initialize the image contents */
IndexType index;
for (unsigned int slice = 0; slice < size[2]; slice++)
{
index[2] = slice;
for (unsigned int row = 0; row < size[1]; row++)
{
index[1] = row;
for (unsigned int col = 0; col < size[0]; col++)
{
index[0] = col;
PixelType value = (PixelType)(slice+row+col);
image->SetPixel(index,value);
}
}
}
typedef itk::RayCastInterpolateImageFunction<
ImageType,double> RayCastInterpolatorType;
/* Create and initialize the interpolator */
RayCastInterpolatorType::Pointer interp = RayCastInterpolatorType::New();
interp->SetInputImage(image);
interp->Print( std::cout );
PointType focus;
focus[0] = 15.0;
focus[1] = 15.0;
focus[2] = 100.0;
interp->SetFocalPoint( focus );
/* Create the transform */
typedef itk::TranslationTransform<
double,ImageDimension> TransformType;
TransformType::Pointer transform = TransformType::New();
interp->SetTransform( transform );
/* Create the auxiliary interpolator */
typedef itk::LinearInterpolateImageFunction<
ImageType, double > InterpolatorType;
InterpolatorType::Pointer auxInterpolator = InterpolatorType::New();
interp->SetInterpolator( auxInterpolator );
/* Exercise the SetThreshold() method */
interp->SetThreshold( 1.0 );
/* Evaluate the function */
double integral;
PointType query;
query[0] = 15.;
query[1] = 15.;
query[2] = -2.;
integral = interp->Evaluate(query);
std::cout << "Integral = " << integral << std::endl;
TEST_EXPECT_TRUE( itk::Math::FloatAlmostEqual( integral, 1247. ) );
return EXIT_SUCCESS;
}
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