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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkSymmetricEllipsoidInteriorExteriorSpatialFunctionTest.cxx
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#if defined(_MSC_VER)
#pragma warning ( disable : 4786 )
#endif
#include "itkSymmetricEllipsoidInteriorExteriorSpatialFunction.h"
int itkSymmetricEllipsoidInteriorExteriorSpatialFunctionTest(int, char* [] )
{
std::cout << "itkSymmetricEllipsoidInteriorExteriorSpatialFunction test start" << std::endl;
// Test will create an ellipsoid (3-dimensional)
const unsigned int dimension = 3;
// Symmetric Ellipsoid spatial function typedef
typedef itk::SymmetricEllipsoidInteriorExteriorSpatialFunction<3> TSymEllipsoidFunctionType;
// Point position typedef
typedef TSymEllipsoidFunctionType::InputType TSymEllipsoidFunctionVectorType;
// Create an ellipsoid spatial function for the source image
TSymEllipsoidFunctionType::Pointer spatialFunc = TSymEllipsoidFunctionType::New();
// Define function doitkSymmetricEllipsoidInteriorExteriorSpatialFunctionTest, which encapsulates ellipsoid.
int xExtent = 50;
int yExtent = 50;
int zExtent = 50;
// Define and set the center of the ellipsoid in the center of
// the function doitkSymmetricEllipsoidInteriorExteriorSpatialFunctionTest
TSymEllipsoidFunctionVectorType center;
center[0] = xExtent/2;
center[1] = yExtent/2;
center[2] = zExtent/2;
spatialFunc->SetCenter(center);
// Define and set the orientation and axes lengths of the ellipsoid
// NOTE: Orienation vector must be normalized!!!!
itk::Vector<double, 3> orientation;
orientation[0] = 1/vcl_sqrt(2.0);
orientation[1] = 1/vcl_sqrt(2.0);
orientation[2] = 0;
double uniqueAxisLength = 45;
double symmetricAxesLength = 30;
spatialFunc->SetOrientation(orientation, uniqueAxisLength, symmetricAxesLength);
// Evaluate all points in the spatial function and count the number of
// pixels that are inside the sphere.
double testPosition[dimension]; // position of a pixel in the function doitkSymmetricEllipsoidInteriorExteriorSpatialFunctionTest
bool functionValue; // Value of pixel at a given position
int interiorPixelCounter = 0; // Count pixels inside ellipsoid
for(int x = 0; x < xExtent; x++)
{
for(int y = 0; y < yExtent; y++)
{
for(int z =0; z < zExtent; z++)
{
testPosition[0] = x;
testPosition[1] = y;
testPosition[2] = z;
functionValue = spatialFunc->Evaluate(testPosition);
if(functionValue == 1)
interiorPixelCounter++;
}
}
}
// Evaluate the center of the ellipsoid, which is inside the ellipsoid and
// should equal 1.
testPosition[0] = center[0];
testPosition[1] = center[1];
testPosition[2] = center[2];
functionValue = spatialFunc->Evaluate(testPosition);
// Volume of ellipsoid using V=(4/3)*pi*(a/2)*(b/2)*(c/2)
double volume = 4.18879013333*(uniqueAxisLength/2)*(symmetricAxesLength/2)*(symmetricAxesLength/2);
// Percent difference in volume measurement and calculation
double volumeError = (vcl_fabs(volume - interiorPixelCounter)/volume)*100;
// 5% error was randomly chosen as a successful ellipsoid fill.
// This should actually be some function of the image/ellipsoid size.
if(volumeError <= 5 || functionValue == 1)
{
// With testing settings, results should yield:
// calculated ellipsoid volume = 21205.8 pixels
// measured ellipsoid volume = 21197 pixels
// volume error = 0.04126%
// function value = 1
std::cout << "calculated ellipsoid volume = " << volume << std::endl
<< "measured ellipsoid volume = " << interiorPixelCounter << std::endl
<< "volume error = " << volumeError << "%" << std::endl
<< "function value = " << functionValue << std::endl
<< "center location = (" << spatialFunc->GetCenter()[0] << ", " << spatialFunc->GetCenter()[0]
<< ", " << spatialFunc->GetCenter()[2] << ")" << std::endl
<< "itkSymmetricEllipsoidSpatialFunction ended successfully!" << std::endl;
return EXIT_SUCCESS;
}
//Default behavior is to fail
std::cerr << "calculated ellipsoid volume = " << volume << std::endl
<< "measured ellipsoid volume = " << interiorPixelCounter << std::endl
<< "volume error = " << volumeError << "%" << std::endl
<< "function value = " << functionValue << std::endl
<< "center location = (" << spatialFunc->GetCenter()[0] << ", " << spatialFunc->GetCenter()[0]
<< ", " << spatialFunc->GetCenter()[2] << ")" << std::endl
<< "itkSymmetricEllipsoidSpatialFunction failed :(" << std::endl;
return EXIT_FAILURE;
}
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