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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkExpandImageFilter.h,v $
Language: C++
Date: $Date: 2006-03-27 17:01:09 $
Version: $Revision: 1.11 $
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 __itkExpandImageFilter_h
#define __itkExpandImageFilter_h
#include "itkImageToImageFilter.h"
#include "itkInterpolateImageFunction.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.
*
* When the LargestPossibleRegion is requested, the output image will
* contain padding at the upper edge of each dimension. The width
* of padding in the i'th dimension is (ExpandFactors[i] - 1). Users can
* specify the padding value used by setting the EdgePaddingValue.
*
* 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
*/
template <
class TInputImage,
class TOutputImage
>
class ITK_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;
/** Set the interpolator function. */
itkSetObjectMacro( Interpolator, InterpolatorType );
/** Get a pointer to the interpolator function. */
itkGetObjectMacro( Interpolator, InterpolatorType );
/** Set the expand factors. Values are clamped to
* a minimum value of 1. Default is 1 for all dimensions. */
virtual void SetExpandFactors( const unsigned int factors[] );
virtual void SetExpandFactors( const unsigned int factor );
/** Get the expand factors. */
virtual const unsigned int * GetExpandFactors() const
{ return m_ExpandFactors; }
/** Set the edge padding value. The default is zero. */
itkSetMacro( EdgePaddingValue, OutputPixelType );
/** Get the edge padding value */
itkGetMacro( EdgePaddingValue, OutputPixelType );
/** 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();
/** 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();
#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() {}
void PrintSelf(std::ostream& os, Indent indent) const;
/** 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,
int threadId );
/** This method is used to set the state of the filter before
* multi-threading. */
virtual void BeforeThreadedGenerateData();
private:
ExpandImageFilter(const Self&); //purposely not implemented
void operator=(const Self&); //purposely not implemented
unsigned int m_ExpandFactors[ImageDimension];
InterpolatorPointer m_Interpolator;
OutputPixelType m_EdgePaddingValue;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkExpandImageFilter.txx"
#endif
#endif
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