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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.
*
*=========================================================================*/
#ifndef itkExpandImageFilter_h
#define itkExpandImageFilter_h
#include "itkImageToImageFilter.h"
#include "itkLinearInterpolateImageFunction.h"
namespace itk
{
/** \class ExpandImageFilter
* \brief Expand the size of an image by an integer factor in each
* dimension.
*
* ExpandImageFilter increases the size of an image by an integer
* factor in each dimension using a interpolation method.
* The output image size in each dimension is given by:
*
* OutputSize[j] = InputSize[j] * ExpandFactors[j]
*
* The output values are obtained by interpolating the input image.
* The default interpolation type used is the LinearInterpolateImageFunction.
* The user can specify a particular interpolation function via
* SetInterpolator(). Note that the input interpolator must derive
* from base class InterpolateImageFunction.
*
* This filter will produce an output with different pixel spacing
* that its input image such that:
*
* OutputSpacing[j] = InputSpacing[j] / ExpandFactors[j]
*
* The filter is templated over the input image type and the output
* image type.
*
* This filter is implemented as a multithreaded filter and supports
* streaming.
*
* \warning This filter only works for image with scalar pixel types.
* For vector images use VectorExpandImageFilter.
*
* This filter assumes that the input and output image has the same
* number of dimensions.
*
* \sa InterpolateImageFunction
* \sa LinearInterpolationImageFunction
* \sa VectorExpandImageFilter
*
* \ingroup GeometricTransform
* \ingroup ITKImageGrid
*/
template< typename TInputImage, typename TOutputImage >
class ITK_TEMPLATE_EXPORT ExpandImageFilter:
public ImageToImageFilter< TInputImage, TOutputImage >
{
public:
/** Standard class typedefs. */
typedef ExpandImageFilter Self;
typedef ImageToImageFilter< TInputImage, TOutputImage > Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro(ExpandImageFilter, ImageToImageFilter);
/** Typedef to describe the output image region type. */
typedef typename TOutputImage::RegionType OutputImageRegionType;
/** ImageDimension enumeration. */
itkStaticConstMacro(ImageDimension, unsigned int,
TInputImage::ImageDimension);
/** Inherit some types from superclass. */
typedef typename Superclass::InputImageType InputImageType;
typedef typename Superclass::OutputImageType OutputImageType;
typedef typename OutputImageType::PixelType OutputPixelType;
typedef typename InputImageType::Pointer InputImagePointer;
typedef typename OutputImageType::Pointer OutputImagePointer;
/** Typedef support for the interpolation function. */
typedef double CoordRepType;
typedef InterpolateImageFunction< InputImageType, CoordRepType > InterpolatorType;
typedef typename InterpolatorType::Pointer InterpolatorPointer;
typedef LinearInterpolateImageFunction< InputImageType, CoordRepType >
DefaultInterpolatorType;
/** Get/Set the interpolator function. */
itkSetObjectMacro(Interpolator, InterpolatorType);
itkGetModifiableObjectMacro(Interpolator, InterpolatorType);
/** The type of the expand factors representation */
typedef FixedArray< unsigned int, ImageDimension > ExpandFactorsType;
/** Set the expand factors. Values are clamped to
* a minimum value of 1. Default is 1 for all dimensions. */
itkSetMacro(ExpandFactors, ExpandFactorsType);
virtual void SetExpandFactors(const unsigned int factor);
/** Get the expand factors. */
itkGetConstReferenceMacro(ExpandFactors, ExpandFactorsType);
/** ExpandImageFilter produces an image which is a different resolution and
* with a different pixel spacing than its input image. As such,
* ExpandImageFilter needs to provide an implementation for
* UpdateOutputInformation() in order to inform the pipeline execution model.
* The original documentation of this method is below.
* \sa ProcessObject::GenerateOutputInformaton() */
virtual void GenerateOutputInformation() ITK_OVERRIDE;
/** ExpandImageFilter needs a smaller input requested region than the output
* requested region. As such, ShrinkImageFilter needs to provide an
* implementation for GenerateInputRequestedRegion() in order to inform
* the pipeline execution model.
* \sa ProcessObject::GenerateInputRequestedRegion() */
virtual void GenerateInputRequestedRegion() ITK_OVERRIDE;
#ifdef ITK_USE_CONCEPT_CHECKING
// Begin concept checking
itkConceptMacro( InputHasNumericTraitsCheck,
( Concept::HasNumericTraits< typename TInputImage::PixelType > ) );
itkConceptMacro( OutputHasNumericTraitsCheck,
( Concept::HasNumericTraits< OutputPixelType > ) );
// End concept checking
#endif
protected:
ExpandImageFilter();
~ExpandImageFilter() ITK_OVERRIDE {}
void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;
/** ExpandImageFilter is implemented as a multithreaded filter. Therefore,
* this implementation provides a ThreadedGenerateData() routine which
* is called for each processing thread. The output image data is allocated
* automatically by the superclass prior to calling ThreadedGenerateData().
* ThreadedGenerateData can only write to the portion of the output image
* specified by the parameter "outputRegionForThread"
*
* \sa ImageToImageFilter::ThreadedGenerateData(),
* ImageToImageFilter::GenerateData() */
virtual
void ThreadedGenerateData(const OutputImageRegionType & outputRegionForThread,
ThreadIdType threadId) ITK_OVERRIDE;
/** This method is used to set the state of the filter before
* multi-threading. */
virtual void BeforeThreadedGenerateData() ITK_OVERRIDE;
private:
ITK_DISALLOW_COPY_AND_ASSIGN(ExpandImageFilter);
ExpandFactorsType m_ExpandFactors;
InterpolatorPointer m_Interpolator;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkExpandImageFilter.hxx"
#endif
#endif
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