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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkBSplineDownsampleImageFilter.h,v $
Language: C++
Date: $Date: 2006-03-16 13:35:01 $
Version: $Revision: 1.4 $
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
Portions of this code are covered under the VTK copyright.
See VTKCopyright.txt or http://www.kitware.com/VTKCopyright.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 __itkBSplineDownsampleImageFilter_h
#define __itkBSplineDownsampleImageFilter_h
// include .h for each ResamplerType
#include "itkBSplineResampleImageFilterBase.h"
#include "itkBSplineL2ResampleImageFilterBase.h"
#include "itkBSplineCenteredResampleImageFilterBase.h"
#include "itkBSplineCenteredL2ResampleImageFilterBase.h"
namespace itk
{
/** \class BSplineDownsampleImageFilter
* \brief Down-samples an image by a factor of 2 using B-Spline filter interpolation.
*
* This class is the public interface for spline down-sampling as defined by the
* ResamplerType.
* Requires the use of a resampler type. If in doubt, the basic itkBSplineResampleImageFilterBase
* should work fine for most applications.
*
* This class may also be used to create a smoother by combining it with the upSampler
* as in the following example:
* typedef itk::BSplineResampleImageFilterBase<ImageType2D, ImageType2D> ResamplerType;
* typedef itk::BSplineDownsampleImageFilter<ImageType2D,ImageType2D,ResamplerType> DownsamplerType2D;
* typedef itk::BSplineUpsampleImageFilter<ImageType2D,ImageType2D,ResamplerType> UpsamplerType2D;
*
* DownsamplerType2D::Pointer downSampler = DownsamplerType2D::New();
* UpsamplerType2D::Pointer upSampler = UpsamplerType2D::New();
* int splineOrder = 3;
* downSampler->SetSplineOrder(splineOrder);
* upSampler->SetSplineOrder(splineOrder);
*
* downSampler->SetInput(image);
* downSampler->Update();
*
* upSampler->SetInput( downSampler->GetOutput() ); // output of downSampler is input to upSampler
* upSampler->Update();
*
* ImageTypePtr2D outImage2 = upSampler->GetOutput(); // outImage2 is the smoothed imaged
*
* Limitations: This class requires specification of a resampler type which may
* be one of:
* itkBSplineResampleImageFilterBase,
* itkBSplineL2ResampleImageFilterBase
* itkBSplineSplineCenteredResampleImageFilterBase,
* itkBSplineCenteredL2ResampleImageFilterBase
* The limitations of these resampler types will apply to this filter.
* Downsamples only by a factor of 2.
*
* \sa itkBSplineDownsampleImageFilter
* \sa itkBSplineL2ResampleImageFilter
* \sa itkBSplineResampleImageFilterBase
* \sa itkBSplineCenteredResampleImageFilterBase
* \sa itkBSplineCenteredL2ResampleImageFilterBase
*
* \ingroup GeometricTransformationFilters
* \ingroup SingleThreaded
* \ingroup CannotBeStreamed
*/
//= ITK_TYPENAME BSplineResampleImageFilterBase<TInputImage, TOutputImage>
template <class TInputImage, class TOutputImage,
class ResamplerType = BSplineResampleImageFilterBase<TInputImage, TOutputImage> >
class ITK_EXPORT BSplineDownsampleImageFilter :
public ResamplerType
{
public:
/** Standard class typedefs. */
typedef BSplineDownsampleImageFilter Self;
typedef ResamplerType Superclass;
typedef SmartPointer<Self> Pointer;
typedef SmartPointer<const Self> ConstPointer;
/** Run-time type information (and related methods). */
itkTypeMacro(BSplineDownsampleImageFilter, ResamplerType);
/** New macro for creation of through a Smart Pointer */
itkNewMacro( Self );
/** InputImageType typedef support. */
typedef typename Superclass::InputImageType InputImageType;
/** InputImagePointer typedef support. */
typedef typename Superclass::InputImagePointer InputImagePointer;
/** OutputImagePointer typedef support. */
typedef typename Superclass::OutputImagePointer OutputImagePointer;
/** OutputImageIterator typedef support. */
typedef typename Superclass::OutputImageIterator OutputImageIterator;
/** Creates an image half the size of the input image with spacing twice the
* input image. */
void GenerateOutputInformation();
/** This filter requires all of the input image */
void GenerateInputRequestedRegion();
#ifdef ITK_USE_CONCEPT_CHECKING
/** Begin concept checking */
itkConceptMacro(DoubleConvertibleToOutputCheck,
(Concept::Convertible<double, typename TOutputImage::PixelType>));
/** End concept checking */
#endif
protected:
void GenerateData();
void EnlargeOutputRequestedRegion( DataObject *output );
BSplineDownsampleImageFilter();
virtual ~BSplineDownsampleImageFilter() {};
private:
BSplineDownsampleImageFilter( const Self& ); //purposely not implemented
void operator=( const Self& ); //purposely not implemented
};
} // namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkBSplineDownsampleImageFilter.txx"
#endif
#endif
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