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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkBinaryBallStructuringElement.txx.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:33 $ |
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Version: $Revision: 1.4 $ |
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Copyright (c) Insight Software Consortium. All rights reserved. |
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See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details. |
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This software is distributed WITHOUT ANY WARRANTY; without even |
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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PURPOSE. See the above copyright notices for more information. |
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=========================================================================*/ |
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DEF |
#ifndef _itkBinaryBallStructuringElement_txx |
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DEF |
#define _itkBinaryBallStructuringElement_txx |
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#include "itkBinaryBallStructuringElement.h" |
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#include "itkImage.h" |
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#include "itkImageRegionIterator.h" |
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#include "itkFloodFilledSpatialFunctionConditionalIterator.h" |
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#include "itkEllipsoidInteriorExteriorSpatialFunction.h" |
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namespace itk |
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{ |
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// Create the structuring element |
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template <class TPixel, unsigned int VDimension, class TAllocator> |
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void |
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BinaryBallStructuringElement<TPixel, VDimension, TAllocator> |
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::CreateStructuringElement() |
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{ |
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unsigned int i; |
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// Image typedef |
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typedef Image<TPixel, VDimension> ImageType; |
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// Create an image to hold the ellipsoid |
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// |
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typename ImageType::Pointer sourceImage = ImageType::New(); |
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typename ImageType::RegionType region; |
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region.SetSize( this->GetSize() ); |
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sourceImage->SetLargestPossibleRegion( region ); |
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sourceImage->SetBufferedRegion( region ); |
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sourceImage->SetRequestedRegion( region ); |
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sourceImage->Allocate(); |
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// Set the background to be zero |
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// |
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ImageRegionIterator<ImageType> it = |
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****ImageRegionIterator<ImageType>(sourceImage, region); |
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for(it.GoToBegin(); !it.IsAtEnd(); ++it) |
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{ |
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it.Set(NumericTraits<TPixel>::Zero); |
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} |
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// Create the ellipsoid |
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// |
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// Ellipsoid spatial function typedef |
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typedef EllipsoidInteriorExteriorSpatialFunction<VDimension> |
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****EllipsoidType; |
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// Create an ellipsoid spatial function for the source image |
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typename EllipsoidType::Pointer spatialFunction = EllipsoidType::New(); |
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// Define and set the axes lengths for the ellipsoid |
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typename EllipsoidType::InputType axes; |
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for (i=0; i < VDimension; i++) |
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{ |
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axes[i] = this->GetSize(i); |
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} |
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spatialFunction->SetAxes( axes ); |
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// Define and set the center of the ellipsoid in physical space |
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typename EllipsoidType::InputType center; |
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for (i=0; i < VDimension; i++) |
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{ |
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// put the center of ellipse in the middle of the center pixel |
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center[i] = this->GetRadius(i) + 0.5; |
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} |
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spatialFunction->SetCenter( center ); |
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// Define the orientations of the ellipsoid axes, for now, we'll use |
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// the identify matrix |
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typename EllipsoidType::OrientationType orientations; |
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orientations.fill( 0.0 ); |
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orientations.fill_diagonal( 1.0 ); |
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spatialFunction->SetOrientations(orientations); |
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typename ImageType::IndexType seed; |
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for (i=0; i < VDimension; i++) |
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{ |
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seed[i] = this->GetRadius(i); |
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} |
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FloodFilledSpatialFunctionConditionalIterator<ImageType, EllipsoidType> |
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****sfi = FloodFilledSpatialFunctionConditionalIterator<ImageType, |
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EllipsoidType>(sourceImage, spatialFunction, seed); |
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sfi.SetCenterInclusionStrategy(); |
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// Iterate through the entire image and set interior pixels to 1 |
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for(; !sfi.IsAtEnd(); ++sfi) |
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{ |
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sfi.Set(NumericTraits<TPixel>::One); |
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} |
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// Copy the ellipsoid into the kernel |
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// |
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Iterator kernel_it; |
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for (it.GoToBegin(), kernel_it=this->Begin(); !it.IsAtEnd(); |
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*******++it, ++kernel_it) |
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{ |
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*kernel_it = it.Get(); |
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} |
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// Clean up |
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// ...temporary image should be cleaned up by SmartPointers automatically |
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} |
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} // namespace itk |
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#endif |
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