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itkImageMaskSpatialObject.txx
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itkImageMaskSpatialObject.txx
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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkImageMaskSpatialObject.txx
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.
=========================================================================*/
#ifndef __ImageMaskSpatialObject_txx
#define __ImageMaskSpatialObject_txx
#include "itkImageMaskSpatialObject.h"
namespace itk
{
/** Constructor */
template< unsigned int TDimension>
ImageMaskSpatialObject< TDimension>
::ImageMaskSpatialObject()
{
this->SetTypeName("ImageMaskSpatialObject");
this->ComputeBoundingBox();
}
/** Destructor */
template< unsigned int TDimension>
ImageMaskSpatialObject< TDimension>
::~ImageMaskSpatialObject()
{
}
/** Test whether a point is inside or outside the object
* For computational speed purposes, it is faster if the method does not
* check the name of the class and the current depth */
template< unsigned int TDimension >
bool
ImageMaskSpatialObject< TDimension >
::IsInside( const PointType & point) const
{
if(this->GetBounds()->IsInside(point))
{
if(!this->GetIndexToWorldTransform()->GetInverse(const_cast<TransformType *>(this->GetInternalInverseTransform())))
{
return false;
}
PointType p = this->GetInternalInverseTransform()->TransformPoint(point);
IndexType index;
for(unsigned int i=0; i<TDimension; i++)
{
index[i] = static_cast<int>( p[i] );
}
bool inside = ( this->GetImage()->GetPixel(index) != NumericTraits<PixelType>::Zero );
return inside;
}
return false;
}
/** Return true if the given point is inside the image */
template< unsigned int TDimension>
bool
ImageMaskSpatialObject< TDimension>
::IsInside( const PointType & point, unsigned int depth, char * name ) const
{
if(name == NULL)
{
if(IsInside(point))
{
return true;
}
}
else if(strstr(typeid(Self).name(), name))
{
if(IsInside(point))
{
return true;
}
}
return SpatialObject<TDimension>::IsInside(point, depth, name);
}
template< unsigned int TDimension >
typename ImageMaskSpatialObject< TDimension >::RegionType
ImageMaskSpatialObject< TDimension >
::GetAxisAlignedBoundingBoxRegion() const
{
// We will use a slice iterator to iterate through slices orthogonal
// to each of the axis of the image to find the bounding box. Each
// slice iterator iterates from the outermost slice towards the image
// center till it finds a mask pixel. For a 3D image, there will be six
// slice iterators, iterating from the periphery inwards till the bounds
// along each axes are found. The slice iterators save time and avoid
// having to walk the whole image. Since we are using slice iterators,
// we will implement this only for 3D images.
PixelType outsideValue = NumericTraits< PixelType >::Zero;
RegionType region;
ImagePointer image = this->GetImage();
if( ImageType::ImageDimension == 3)
{
IndexType index;
typename RegionType::SizeType size;
for( unsigned int axis = 0; axis < ImageType::ImageDimension; axis++ )
{
// Two slice iterators along each axis...
// Find the orthogonal planes for the slices
unsigned int i, j;
unsigned int direction[2];
for (i = 0, j = 0; i < 3; ++i )
{
if (i != axis )
{
direction[j] = i;
j++;
}
}
// Create the forward iterator to find lower bound
SliceIteratorType fit( image, image->GetRequestedRegion() );
fit.SetFirstDirection( direction[1] );
fit.SetSecondDirection( direction[0] );
fit.GoToBegin();
while( !fit.IsAtEnd() )
{
while( !fit.IsAtEndOfSlice() )
{
while( !fit.IsAtEndOfLine() )
{
if( fit.Get() != outsideValue )
{
index[axis] = fit.GetIndex()[axis];
fit.GoToReverseBegin(); // skip to the end
break;
}
++fit;
}
fit.NextLine();
}
fit.NextSlice();
}
// Create the reverse iterator to find upper bound
SliceIteratorType rit( image, image->GetRequestedRegion() );
rit.SetFirstDirection( direction[1] );
rit.SetSecondDirection( direction[0] );
rit.GoToReverseBegin();
while( !rit.IsAtReverseEnd() )
{
while( !rit.IsAtReverseEndOfSlice() )
{
while( !rit.IsAtReverseEndOfLine() )
{
if( rit.Get() != outsideValue )
{
size[axis] = rit.GetIndex()[axis] - index[axis];
rit.GoToBegin(); //Skip to reverse end
break;
}
--rit;
}
rit.PreviousLine();
}
rit.PreviousSlice();
}
}
region.SetIndex( index );
region.SetSize( size );
}
else
{
itkExceptionMacro( << "ImageDimension must be 3!" );
}
return region;
}
/** Print the object */
template< unsigned int TDimension >
void
ImageMaskSpatialObject< TDimension >
::PrintSelf( std::ostream& os, Indent indent ) const
{
Superclass::PrintSelf(os,indent);
}
} // end namespace itk
#endif //__ImageMaskSpatialObject_txx