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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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)[])
{
using PixelType = unsigned char;
constexpr unsigned int ImageDimension = 3;
using ImageType = itk::Image<PixelType, ImageDimension>;
using IndexType = ImageType::IndexType;
using PointType = ImageType::PointType;
using SpacingType = ImageType::SpacingType;
using SizeType = ImageType::SizeType;
using RegionType = ImageType::RegionType;
/* Allocate a simple test image */
auto 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;
auto value = (PixelType)(slice + row + col);
image->SetPixel(index, value);
}
}
}
using RayCastInterpolatorType = itk::RayCastInterpolateImageFunction<ImageType, double>;
/* Create and initialize the interpolator */
auto interp = RayCastInterpolatorType::New();
ITK_EXERCISE_BASIC_OBJECT_METHODS(interp, RayCastInterpolateImageFunction, InterpolateImageFunction);
// Test exceptions
ITK_TRY_EXPECT_EXCEPTION(interp->GetRadius());
interp->SetInputImage(image);
PointType focus;
focus[0] = 15.0;
focus[1] = 15.0;
focus[2] = 100.0;
interp->SetFocalPoint(focus);
ITK_TEST_SET_GET_VALUE(focus, interp->GetFocalPoint());
/* Create the transform */
using TransformType = itk::TranslationTransform<double, ImageDimension>;
auto transform = TransformType::New();
interp->SetTransform(transform);
ITK_TEST_SET_GET_VALUE(transform, interp->GetTransform());
/* Create the auxiliary interpolator */
using InterpolatorType = itk::LinearInterpolateImageFunction<ImageType, double>;
auto auxInterpolator = InterpolatorType::New();
interp->SetInterpolator(auxInterpolator);
ITK_TEST_SET_GET_VALUE(auxInterpolator, interp->GetInterpolator());
/* Exercise the SetThreshold() method */
double threshold = 1.0;
interp->SetThreshold(threshold);
ITK_TEST_SET_GET_VALUE(threshold, interp->GetThreshold());
/* Evaluate the function */
double integral;
// Evaluate the ray casting function at the same point as the focal point:
// - Allows to increase coverage.
// - Makes the ray be invalid.
// - Sets the traversal direction to TraversalDirectionEnum::UNDEFINED_DIRECTION
// - The integral should equal to 0.
integral = interp->Evaluate(focus);
ITK_TEST_EXPECT_TRUE(itk::Math::FloatAlmostEqual(integral, 0.0));
PointType query;
query[0] = 15.;
query[1] = 15.;
query[2] = -2.;
integral = interp->Evaluate(query);
std::cout << "Integral = " << integral << std::endl;
for (unsigned int d = 0; d < ImageDimension; ++d)
{
ITK_TEST_SET_GET_VALUE(size[d], interp->GetRadius()[d]);
}
ITK_TEST_EXPECT_TRUE(itk::Math::FloatAlmostEqual(integral, 1276.));
ITK_TEST_EXPECT_TRUE(interp->IsInsideBuffer(query));
ITK_TEST_EXPECT_TRUE(interp->IsInsideBuffer(index));
std::cout << "Test finished" << std::endl;
return EXIT_SUCCESS;
}
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