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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 "itkSpatialNeighborSubsampler.h"
#include "itkImageToNeighborhoodSampleAdaptor.h"
#include "itkImageRegionConstIteratorWithIndex.h"
int itkSpatialNeighborSubsamplerTest(int, char * [] )
{
// Given the following 25x25 image on the left
// with the region constraint marked by |---|
// | |
// |---|
// Sample all points within a radius of 10 from the point at (2,6) marked
// by an X in the image. Replace each of the sampled points with a value of 255
// The correct image should match the image on the right where a + indicates a
// value of 255
// input image with search index | output image with sampled
// and region constraint indicated | points indicated by +
// ooooooooooooooooooooooooo | ooooooooooooooooooooooooo
// ooooooooooooooooooooooooo | ooooooooooooooooooooooooo
// ooooooooooooooooooooooooo | ooooooooooooooooooooooooo
// ooooooooooooooooooooooooo | ooooooooooooooooooooooooo
// ooooooooooooooooooooooooo | ooooooooooooooooooooooooo
// |---------------------|oo | +++++++++++++oooooooooooo
// |oXooooooooooooooooooo|oo | +++++++++++++oooooooooooo
// |ooooooooooooooooooooo|oo | +++++++++++++oooooooooooo
// |ooooooooooooooooooooo|oo | +++++++++++++oooooooooooo
// |ooooooooooooooooooooo|oo | +++++++++++++oooooooooooo
// |ooooooooooooooooooooo|oo | +++++++++++++oooooooooooo
// |ooooooooooooooooooooo|oo | +++++++++++++oooooooooooo
// |ooooooooooooooooooooo|oo | +++++++++++++oooooooooooo
// |ooooooooooooooooooooo|oo | +++++++++++++oooooooooooo
// |---------------------|oo | +++++++++++++oooooooooooo
// ooooooooooooooooooooooooo | ooooooooooooooooooooooooo
// ooooooooooooooooooooooooo | ooooooooooooooooooooooooo
// ooooooooooooooooooooooooo | ooooooooooooooooooooooooo
// ooooooooooooooooooooooooo | ooooooooooooooooooooooooo
// ooooooooooooooooooooooooo | ooooooooooooooooooooooooo
// ooooooooooooooooooooooooo | ooooooooooooooooooooooooo
// ooooooooooooooooooooooooo | ooooooooooooooooooooooooo
// ooooooooooooooooooooooooo | ooooooooooooooooooooooooo
// ooooooooooooooooooooooooo | ooooooooooooooooooooooooo
// ooooooooooooooooooooooooo | ooooooooooooooooooooooooo
std::cout << "SpatialNeighborSubsampler Test \n \n";
typedef unsigned int PixelType;
typedef itk::Image< PixelType, 2 > ImageType;
typedef ImageType::RegionType RegionType;
typedef ImageType::IndexType IndexType;
typedef ImageType::SizeType SizeType;
typedef itk::ZeroFluxNeumannBoundaryCondition< ImageType >
BoundaryCondition;
typedef itk::Statistics::ImageToNeighborhoodSampleAdaptor< ImageType, BoundaryCondition >
AdaptorType;
typedef itk::Statistics::SpatialNeighborSubsampler< AdaptorType, RegionType >
SamplerType;
typedef itk::ImageRegionConstIteratorWithIndex< ImageType >
IteratorType;
ImageType::Pointer inImage = ImageType::New();
SizeType sz;
sz.Fill(25);
IndexType idx;
idx.Fill(0);
RegionType region;
region.SetSize(sz);
region.SetIndex(idx);
inImage->SetRegions(region);
inImage->Allocate(true); // initialize buffer
// to zero
SizeType szConstraint;
szConstraint[0] = 23;
szConstraint[1] = 10;
IndexType idxConstraint;
idxConstraint[0] = 0;
idxConstraint[1] = 5;
RegionType regionConstraint;
regionConstraint.SetSize(szConstraint);
regionConstraint.SetIndex(idxConstraint);
AdaptorType::Pointer sample = AdaptorType::New();
sample->SetImage(inImage);
SamplerType::Pointer sampler_orig = SamplerType::New();
sampler_orig->SetSample(sample);
sampler_orig->SetSampleRegion(region);
sampler_orig->SetRegionConstraint(regionConstraint);
sampler_orig->SetRadius(10);
sampler_orig->CanSelectQueryOn();
// test clone mechanism
SamplerType::Pointer sampler = sampler_orig->Clone().GetPointer();
if (sampler->GetSample() != sampler_orig->GetSample())
{
std::cerr << "Clone did not copy the sample correctly!" << std::endl;
return EXIT_FAILURE;
}
if (sampler->GetSampleRegion() != sampler_orig->GetSampleRegion())
{
std::cerr << "Clone did not copy the region correctly!" << std::endl;
return EXIT_FAILURE;
}
if (sampler->GetRegionConstraint() != sampler_orig->GetRegionConstraint())
{
std::cerr << "Clone did not copy the region constraint correctly!" << std::endl;
return EXIT_FAILURE;
}
if (sampler->GetRadius() != sampler_orig->GetRadius())
{
std::cerr << "Clone did not copy the radius correctly!" << std::endl;
return EXIT_FAILURE;
}
if (sampler->GetCanSelectQuery() != sampler_orig->GetCanSelectQuery())
{
std::cerr << "Clone did not copy CanSelectQuery correctly!" << std::endl;
return EXIT_FAILURE;
}
SamplerType::SubsamplePointer subsample = SamplerType::SubsampleType::New();
IndexType queryIdx;
queryIdx[0] = 2;
queryIdx[1] = 6;
ImageType::OffsetValueType queryOffset = inImage->ComputeOffset(queryIdx);
sampler->Search(queryOffset, subsample);
IndexType index;
for (SamplerType::SubsampleConstIterator sIt = subsample->Begin();
sIt != subsample->End();
++sIt)
{
index = sIt.GetMeasurementVector()[0].GetIndex();
inImage->SetPixel(index, 255);
}
// To validate, create a region that should contain only the points that
// should now be = 255. Iterate through the image and confirm that only
// values inside the region are 255 and that ALL values within the region
// are 255.
SizeType validSz;
validSz[0] = 13;
validSz[1] = 10;
IndexType validStart;
validStart[0] = 0;
validStart[1] = 5;
RegionType validRegion;
validRegion.SetSize(validSz);
validRegion.SetIndex(validStart);
IteratorType it( inImage, region);
it.GoToBegin();
while( !it.IsAtEnd() )
{
PixelType curValue = it.Get();
IndexType curIdx = it.GetIndex();
if (validRegion.IsInside(curIdx))
{
// inside the region, value must be 255
if (curValue != 255)
{
std::cout << "Error! Pixel at " << curIdx
<< " should be 255 but is " << curValue
<< " instead!" << std::endl;
return EXIT_FAILURE;
}
}
else
{
// outside of the region, value must be 0
if (curValue != 0)
{
std::cout << "Error! Pixel at " << curIdx
<< " should be 0 but is " << curValue
<< " instead!" << std::endl;
return EXIT_FAILURE;
}
}
++it;
} // end for each point in the image
std::cout << "All pixels and only pixels within intersection of"
<< " the image region and constraint region are equal to 255."
<< std::endl;
return EXIT_SUCCESS;
}
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