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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkBinaryBallStructuringElement.txx,v $
Language: C++
Date: $Date: 2006-03-19 23:21:38 $
Version: $Revision: 1.12 $
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.
=========================================================================*/
#ifndef __itkBinaryBallStructuringElement_txx
#define __itkBinaryBallStructuringElement_txx
#include "itkBinaryBallStructuringElement.h"
#include "itkImage.h"
#include "itkImageRegionIterator.h"
#include "itkFloodFilledSpatialFunctionConditionalIterator.h"
#include "itkEllipsoidInteriorExteriorSpatialFunction.h"
namespace itk
{
// Create the structuring element
template <class TPixel, unsigned int VDimension, class TAllocator>
void
BinaryBallStructuringElement<TPixel, VDimension, TAllocator>
::CreateStructuringElement()
{
unsigned int i;
// Image typedef
typedef Image<TPixel, VDimension> ImageType;
// Create an image to hold the ellipsoid
//
typename ImageType::Pointer sourceImage = ImageType::New();
typename ImageType::RegionType region;
region.SetSize( this->GetSize() );
sourceImage->SetLargestPossibleRegion( region );
sourceImage->SetBufferedRegion( region );
sourceImage->SetRequestedRegion( region );
sourceImage->Allocate();
// Set the background to be zero
//
ImageRegionIterator<ImageType> it =
ImageRegionIterator<ImageType>(sourceImage, region);
for(it.GoToBegin(); !it.IsAtEnd(); ++it)
{
it.Set(NumericTraits<TPixel>::Zero);
}
// Create the ellipsoid
//
// Ellipsoid spatial function typedef
typedef EllipsoidInteriorExteriorSpatialFunction<VDimension> EllipsoidType;
// Create an ellipsoid spatial function for the source image
typename EllipsoidType::Pointer spatialFunction = EllipsoidType::New();
// Define and set the axes lengths for the ellipsoid
typename EllipsoidType::InputType axes;
for (i=0; i < VDimension; i++)
{
axes[i] = this->GetSize(i);
}
spatialFunction->SetAxes( axes );
// Define and set the center of the ellipsoid in physical space
typename EllipsoidType::InputType center;
for (i=0; i < VDimension; i++)
{
// put the center of ellipse in the middle of the center pixel
center[i] = this->GetRadius(i) + 0.5;
}
spatialFunction->SetCenter( center );
// Define the orientations of the ellipsoid axes, for now, we'll use
// the identify matrix
typename EllipsoidType::OrientationType orientations;
orientations.fill( 0.0 );
orientations.fill_diagonal( 1.0 );
spatialFunction->SetOrientations(orientations);
typename ImageType::IndexType seed;
for (i=0; i < VDimension; i++)
{
seed[i] = this->GetRadius(i);
}
FloodFilledSpatialFunctionConditionalIterator<ImageType, EllipsoidType>
sfi = FloodFilledSpatialFunctionConditionalIterator<ImageType,
EllipsoidType>(sourceImage, spatialFunction, seed);
sfi.SetCenterInclusionStrategy();
// Iterate through the entire image and set interior pixels to 1
for(; !sfi.IsAtEnd(); ++sfi)
{
sfi.Set(NumericTraits<TPixel>::One);
}
// Copy the ellipsoid into the kernel
//
Iterator kernel_it;
for (it.GoToBegin(), kernel_it=this->Begin();!it.IsAtEnd();++it,++kernel_it)
{
*kernel_it = it.Get();
}
// Clean up
// ...temporary image should be cleaned up by SmartPointers automatically
}
} // namespace itk
#endif
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