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itkKullbackLeiblerCompareHistogramImageToImageMetricTest.cxx
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itkKullbackLeiblerCompareHistogramImageToImageMetricTest.cxx
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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 "itkKullbackLeiblerCompareHistogramImageToImageMetric.h"
#include "itkLinearInterpolateImageFunction.h"
#include "itkTimeProbesCollectorBase.h"
#include "vnl/vnl_sample.h"
#include <iostream>
/**
* This test uses two 2D-Gaussians (standard deviation RegionSize/2)
* One is shifted by 5 pixels from the other.
*
* This test computes the KullbackLeibler information value and derivatives
* for various shift values in (-10,10).
*
*/
int
itkKullbackLeiblerCompareHistogramImageToImageMetricTest(int, char *[])
{
//------------------------------------------------------------
// Create four simple images
//------------------------------------------------------------
// Allocate Images
using MovingImageType = itk::Image<unsigned char, 2>;
using FixedImageType = itk::Image<unsigned char, 2>;
using TrainingMovingImageType = itk::Image<unsigned char, 2>;
using TrainingFixedImageType = itk::Image<unsigned char, 2>;
enum
{
ImageDimension = MovingImageType::ImageDimension
};
MovingImageType::SizeType size = { { 16, 16 } };
MovingImageType::IndexType index = { { 0, 0 } };
MovingImageType::RegionType region;
region.SetSize(size);
region.SetIndex(index);
auto imgMoving = MovingImageType::New();
imgMoving->SetRegions(region);
imgMoving->Allocate();
auto imgFixed = FixedImageType::New();
imgFixed->SetRegions(region);
imgFixed->Allocate();
auto imgTrainingMoving = MovingImageType::New();
imgTrainingMoving->SetRegions(region);
imgTrainingMoving->Allocate();
auto imgTrainingFixed = FixedImageType::New();
imgTrainingFixed->SetRegions(region);
imgTrainingFixed->Allocate();
// Fill images with a 2D gaussian
using ReferenceIteratorType = itk::ImageRegionIterator<MovingImageType>;
using TargetIteratorType = itk::ImageRegionIterator<FixedImageType>;
using TrainingReferenceIteratorType = itk::ImageRegionIterator<TrainingMovingImageType>;
using TrainingTargetIteratorType = itk::ImageRegionIterator<TrainingFixedImageType>;
itk::Point<double, 2> center;
center[0] = static_cast<double>(region.GetSize()[0]) / 2.0;
center[1] = static_cast<double>(region.GetSize()[1]) / 2.0;
const double s = static_cast<double>(region.GetSize()[0]) / 2.0;
const double mag = 200.0;
const double noisemag = 0.0; // ended up yielding best results
itk::Point<double, 2> p;
itk::Vector<double, 2> d;
// Set the displacement
itk::Vector<double, 2> displacement;
displacement[0] = 5;
displacement[1] = 0;
ReferenceIteratorType ri(imgMoving, region);
TargetIteratorType ti(imgFixed, region);
TrainingReferenceIteratorType gri(imgTrainingMoving, region);
TrainingTargetIteratorType gti(imgTrainingFixed, region);
ri.GoToBegin();
while (!ri.IsAtEnd())
{
p[0] = ri.GetIndex()[0];
p[1] = ri.GetIndex()[1];
d = p - center;
d += displacement;
const double x = d[0];
const double y = d[1];
ri.Set(static_cast<unsigned char>(mag * std::exp(-(x * x + y * y) / (s * s))));
++ri;
}
ti.GoToBegin();
while (!ti.IsAtEnd())
{
p[0] = ti.GetIndex()[0];
p[1] = ti.GetIndex()[1];
d = p - center;
const double x = d[0];
const double y = d[1];
ti.Set(static_cast<unsigned char>(mag * std::exp(-(x * x + y * y) / (s * s))));
++ti;
}
vnl_sample_reseed(2334237);
gri.GoToBegin();
while (!gri.IsAtEnd())
{
p[0] = gri.GetIndex()[0];
p[1] = gri.GetIndex()[1];
d = p - center;
// d += displacement;
const double x = d[0];
const double y = d[1];
gri.Set(
static_cast<unsigned char>((mag * std::exp(-(x * x + y * y) / (s * s))) + vnl_sample_normal(0.0, noisemag)));
++gri;
}
gti.GoToBegin();
while (!gti.IsAtEnd())
{
p[0] = gti.GetIndex()[0];
p[1] = gti.GetIndex()[1];
d = p - center;
const double x = d[0];
const double y = d[1];
gti.Set(
static_cast<unsigned char>((mag * std::exp(-(x * x + y * y) / (s * s))) + vnl_sample_normal(0.0, noisemag)));
++gti;
}
//-----------------------------------------------------------
// Set up a transformer
//-----------------------------------------------------------
using TransformType = itk::AffineTransform<double, ImageDimension>;
using ParametersType = TransformType::ParametersType;
auto transformer = TransformType::New();
auto TrainingTransform = TransformType::New();
transformer->SetIdentity();
TrainingTransform->SetIdentity();
//------------------------------------------------------------
// Set up an interpolator
//------------------------------------------------------------
using InterpolatorType = itk::LinearInterpolateImageFunction<MovingImageType, double>;
auto interpolator = InterpolatorType::New();
auto TrainingInterpolator = InterpolatorType::New();
//------------------------------------------------------------
// Set up the metric
//------------------------------------------------------------
using MetricType = itk::KullbackLeiblerCompareHistogramImageToImageMetric<FixedImageType, MovingImageType>;
auto metric = MetricType::New();
// connect the interpolator
metric->SetInterpolator(interpolator);
// connect the transform
metric->SetTransform(transformer);
// connect the images to the metric
metric->SetFixedImage(imgFixed);
metric->SetMovingImage(imgMoving);
// set the standard deviations
// metric->SetFixedImageStandardDeviation( 5.0 );
// metric->SetMovingImageStandardDeviation( 5.0 );
// set the number of samples to use
// metric->SetNumberOfSpatialSamples( 100 );
unsigned int nBins = 64;
MetricType::HistogramType::SizeType histSize;
histSize.SetSize(2);
histSize[0] = nBins;
histSize[1] = nBins;
metric->SetHistogramSize(histSize);
// Set scales for derivative calculation.
using ScalesType = MetricType::ScalesType;
ScalesType scales(transformer->GetNumberOfParameters());
for (unsigned int k = 0; k < transformer->GetNumberOfParameters(); ++k)
{
scales[k] = 1;
}
metric->SetDerivativeStepLengthScales(scales);
// set the region over which to compute metric
metric->SetFixedImageRegion(imgFixed->GetBufferedRegion());
//------------------------------------------------------------
// Set up the metric
//------------------------------------------------------------
metric->SetTrainingInterpolator(TrainingInterpolator);
metric->SetTrainingFixedImage(imgTrainingFixed);
metric->SetTrainingMovingImage(imgTrainingMoving);
metric->SetTrainingFixedImageRegion(imgTrainingFixed->GetBufferedRegion());
metric->SetTrainingTransform(TrainingTransform);
// initialize the metric before use
metric->Initialize();
//------------------------------------------------------------
// Set up an affine transform parameters
//------------------------------------------------------------
unsigned int numberOfParameters = transformer->GetNumberOfParameters();
ParametersType parameters(numberOfParameters);
// set the parameters to the identity
unsigned long count = 0;
// initialize the linear/matrix part
for (unsigned int row = 0; row < ImageDimension; ++row)
{
for (unsigned int col = 0; col < ImageDimension; ++col)
{
parameters[count] = 0;
if (row == col)
{
parameters[count] = 1;
}
++count;
}
}
// initialize the offset/vector part
for (unsigned int k = 0; k < ImageDimension; ++k)
{
parameters[count] = 0;
++count;
}
//---------------------------------------------------------
// Print out KullbackLeibler values
// for parameters[4] = {-10,10}
//---------------------------------------------------------
MetricType::MeasureType measure;
MetricType::DerivativeType derivative(numberOfParameters);
itk::TimeProbesCollectorBase collector;
collector.Start("Loop");
std::cout << "param[4]\tKullbackLeibler\tdKullbackLeibler/dparam[4]" << std::endl;
for (double trans = -10; trans <= 4; trans += 0.5)
{
parameters[4] = trans;
metric->GetValueAndDerivative(parameters, measure, derivative);
std::cout << trans << "\t" << measure << "\t" << derivative[4] << std::endl;
// exercise the other functions
metric->GetValue(parameters);
metric->GetDerivative(parameters, derivative);
}
collector.Stop("Loop");
collector.Report();
//-------------------------------------------------------
// exercise misc member functions
//-------------------------------------------------------
std::cout << "Name of class: " << metric->GetNameOfClass() << std::endl;
// std::cout << "No. of samples used = " <<
// metric->GetNumberOfSpatialSamples() << std::endl;
// std::cout << "Fixed image std dev = " <<
// metric->GetFixedImageStandardDeviation() << std::endl;
// std::cout << "Moving image std dev = " <<
// metric->GetMovingImageStandardDeviation() << std::endl;
metric->Print(std::cout);
// itk::KernelFunctionBase::Pointer theKernel = metric->GetKernelFunction();
// metric->SetKernelFunction( theKernel );
// theKernel->Print( std::cout );
// std::cout << "Try causing an exception by making std dev too small";
// std::cout << std::endl;
// metric->SetFixedImageStandardDeviation( 0.001 );
// try
// {
// metric->Initialize();
// std::cout << "Value = " << metric->GetValue( parameters );
// std::cout << std::endl;
// }
// catch(itk::ExceptionObject &err)
// {
// std::cout << "Caught the exception." << std::endl;
// std::cout << err << std::endl;
// }
//
// // reset standard deviation
// metric->SetFixedImageStandardDeviation( 5.0 );
std::cout << "Try causing an exception by making fixed image nullptr";
std::cout << std::endl;
metric->SetFixedImage(nullptr);
try
{
metric->Initialize();
std::cout << "Value = " << metric->GetValue(parameters);
std::cout << std::endl;
}
catch (const itk::ExceptionObject & err)
{
std::cout << "Caught the exception." << std::endl;
std::cout << err << std::endl;
}
return EXIT_SUCCESS;
}