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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
/*=========================================================================
*
* Portions of this file are subject to the VTK Toolkit Version 3 copyright.
*
* Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
*
* For complete copyright, license and disclaimer of warranty information
* please refer to the NOTICE file at the top of the ITK source tree.
*
*=========================================================================*/
#ifndef itkBSplineDownsampleImageFilter_h
#define itkBSplineDownsampleImageFilter_h
// include .h for each ResamplerType
#include "itkBSplineL2ResampleImageFilterBase.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
* \ingroup ITKImageGrid
*/
//= typename BSplineResampleImageFilterBase<TInputImage, TOutputImage>
template< typename TInputImage, typename TOutputImage,
typename ResamplerType = BSplineResampleImageFilterBase< TInputImage, TOutputImage > >
class ITK_TEMPLATE_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() ITK_OVERRIDE;
/** This filter requires all of the input image */
void GenerateInputRequestedRegion() ITK_OVERRIDE;
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro( DoubleConvertibleToOutputCheck,
( Concept::Convertible< double, typename TOutputImage::PixelType > ) );
// End concept checking
#endif
protected:
void GenerateData() ITK_OVERRIDE;
void EnlargeOutputRequestedRegion(DataObject *output) ITK_OVERRIDE;
BSplineDownsampleImageFilter();
virtual ~BSplineDownsampleImageFilter() ITK_OVERRIDE {}
private:
ITK_DISALLOW_COPY_AND_ASSIGN(BSplineDownsampleImageFilter);
};
} // namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkBSplineDownsampleImageFilter.hxx"
#endif
#endif
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