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/*========================================================================= |
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Program: Insight Segmentation & Registration Toolkit |
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Module: $RCSfile: itkImageToImageFilter.h.html,v $ |
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Language: C++ |
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Date: $Date: 2006/01/17 19:15:40 $ |
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Version: $Revision: 1.4 $ |
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Copyright (c) Insight Software Consortium. All rights reserved. |
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See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details. |
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Portions of this code are covered under the VTK copyright. |
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See VTKCopyright.txt or http://www.kitware.com/VTKCopyright.htm for details. |
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This software is distributed WITHOUT ANY WARRANTY; without even |
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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*****PURPOSE. See the above copyright notices for more information. |
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=========================================================================*/ |
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#ifndef __itkImageToImageFilter_h |
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#define __itkImageToImageFilter_h |
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#include "itkImage.h" |
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#include "itkImageSource.h" |
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#include "itkConceptChecking.h" |
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#include "itkImageToImageFilterDetail.h" |
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namespace itk |
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{ |
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/** \class ImageToImageFilter |
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* \brief Base class for filters that take an image as input and produce an image as output. |
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* |
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* ImageToImageFilter is the base class for all process objects that output |
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* image data and require image data as input. Specifically, this class |
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* defines the SetInput() method for defining the input to a filter. |
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* |
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* This class provides the infrastructure for supporting multithreaded |
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* processing of images. If a filter provides an implementation of |
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* GenerateData(), the image processing will run in a single thread and the |
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* implementation is responsible for allocating its output data. If a filter |
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* provides an implementation of ThreadedGenerateData() instead, the image |
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* will be divided into a number of pieces, a number of threads will be |
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* spawned, and ThreadedGenerateData() will be called in each thread. Here, |
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* the output memory will be allocated by this superclass prior to calling |
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* ThreadedGenerateData(). |
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* |
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* ImageToImageFilter provides an implementation of |
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* GenerateInputRequestedRegion(). The base assumption to this point in the |
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* heirarchy is that a process object would ask for the largest possible |
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* region on input in order to produce any output. Imaging filters, |
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* however, can usually answer this question more precisely. The default |
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* implementation of GenerateInputRequestedRegion() in this class is to |
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* request an input that matches the size of the requested output. If a |
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* filter requires more input (say a filter that uses neighborhood |
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* information) or less input (for instance a magnify filter), then these |
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* filters will have to provide another implmentation of this method. By |
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* convention, such implementations should call the Superclass' method |
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* first. |
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* |
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* \ingroup ImageFilters |
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*/ |
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template <class TInputImage, class TOutputImage> |
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class ITK_EXPORT ImageToImageFilter : public ImageSource<TOutputImage> |
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{ |
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public: |
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/** Standard class typedefs. */ |
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typedef ImageToImageFilter Self; |
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TDA |
typedef ImageSource<TOutputImage> Superclass; |
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typedef SmartPointer<Self> Pointer; |
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typedef SmartPointer<const Self> ConstPointer; |
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/** Run-time type information (and related methods). */ |
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itkTypeMacro(ImageToImageFilter,ImageSource); |
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/** Superclass typedefs. */ |
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typedef typename Superclass::OutputImageRegionType OutputImageRegionType; |
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/** Some convenient typedefs. */ |
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typedef TInputImage InputImageType; |
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typedef typename InputImageType::Pointer InputImagePointer; |
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typedef typename InputImageType::ConstPointer InputImageConstPointer; |
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typedef typename InputImageType::RegionType InputImageRegionType; |
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typedef typename InputImageType::PixelType InputImagePixelType; |
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/** ImageDimension constants */ |
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itkStaticConstMacro(InputImageDimension, unsigned int, |
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TInputImage::ImageDimension); |
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itkStaticConstMacro(OutputImageDimension, unsigned int, |
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TOutputImage::ImageDimension); |
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/** Set/Get the image input of this process object. */ |
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virtual void SetInput( const InputImageType *image); |
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virtual void SetInput( unsigned int, const TInputImage * image); |
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const InputImageType * GetInput(void); |
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const InputImageType * GetInput(unsigned int idx); |
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*protected: |
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ImageToImageFilter(); |
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~ImageToImageFilter(); |
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virtual void PrintSelf(std::ostream& os, Indent indent) const; |
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/** What is the input requested region that is required to produce |
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* the output requested region? The base assumption for image |
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* processing filters is that the input requested region can be set |
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* to match the output requested region. If a filter requires more |
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* input (for instance a filter that uses neighborhoods needs more |
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* input than output to avoid introducing artificial boundary |
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* conditions) or less input (for instance a magnify filter) will |
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* have to override this method. In doing so, it should call its |
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* superclass' implementation as its first step. Note that imaging |
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* filters operate differently than the classes to this point in the |
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* class hierachy. Up till now, the base assumption has been that |
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* the largest possible region will be requested of the input. |
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* |
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* This implementation of GenerateInputRequestedRegion() only |
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* processes the inputs that are a subclass of the |
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* ImageBase<InputImageDimension>. If an input is another type of |
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* DataObject (including an Image of a different dimension), they |
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* are skipped by this method. The subclasses of ImageToImageFilter |
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* are responsible for providing an implementation of |
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* GenerateInputRequestedRegion() when there are multiple inputs of |
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* different types. |
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* |
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* \sa ProcessObject::GenerateInputRequestedRegion(), |
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* ImageSource::GenerateInputRequestedRegion() */ |
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virtual void GenerateInputRequestedRegion(); |
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/** Typedef for the region copier function object that converts an |
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* input region to an output region. */ |
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typedef ImageToImageFilterDetail::ImageRegionCopier<itkGetStaticConstMacro(OutputImageDimension), |
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itkGetStaticConstMacro(InputImageDimension)> InputToOutputRegionCopierType; |
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/** Typedef for the region copier function object that converts an |
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* output region to an input region. */ |
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typedef ImageToImageFilterDetail::ImageRegionCopier<itkGetStaticConstMacro(InputImageDimension), |
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itkGetStaticConstMacro(OutputImageDimension)> OutputToInputRegionCopierType; |
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/** This function calls the actual region copier to do the mapping |
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* from output image space to input image space. It uses a Function |
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* object used for dispatching to various routines to copy an output |
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* region (start index and size) to an input region. For most |
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* filters, this is a trivial copy because most filters require the |
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* input dimension to match the output dimension. However, some |
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* filters like itk::ExtractImageFilter can support output images of |
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* a lower dimension that the input. |
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* |
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* This function object can be used by GenerateOutputInformation() |
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* to copy the input LargestPossibleRegion to the output |
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* LargestPossibleRegion and can also be used in GenerateData or |
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* ThreadedGenerateData() where a filter may need to map an |
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* output region to an input region. |
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* |
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* The default copier uses a "dispatch pattern" to call one of three |
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* overloaded functions depending on whether the input and output |
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* images are the same dimension, the input is a higher dimension |
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* that the output, or the input is of a lower dimension than the |
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* output. The use of an overloaded function is required for proper |
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* compilation of the various cases. |
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* |
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* For the latter two cases, trivial implementations are used. If |
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* the input image is a higher dimension than the output, the output |
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* region information is copied into the first portion of the input |
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* region and the rest of the input region is set to zero. If the |
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* input region is a lower dimension than the output, the first |
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* portion of the output region is copied to the input region. |
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* |
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* If a filter needs a different default behavior, it can override |
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* this method. The ExtractImageFilter overrides this function |
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* object so that if the input image is a higher dimension than the |
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* output image, the filter can control "where" in the input image |
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* the output subimage is extracted (as opposed to mapping to first |
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* few dimensions of the input). */ |
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virtual void CallCopyOutputRegionToInputRegion(InputImageRegionType &destRegion, |
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const OutputImageRegionType &srcRegion); |
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/** This function calls the actual region copier to do the mapping |
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* from input image space to output image space. It uses a Function |
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* object used for dispatching to various routines to copy an input |
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* region (start index and size) to an output region. For most |
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* filters, this is a trivial copy because most filters require the |
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* input dimension to match the output dimension. However, some |
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* filters like itk::UnaryFunctorImageFilter can support output |
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* images of a higher dimension that the input. |
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* |
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* This function object is used by the default implementation of |
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* GenerateOutputInformation(). It can also be used in routines |
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* like ThreadedGenerateData() where a filter may need to map an |
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* input region to an output region. |
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* |
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* The default copier uses a "dispatch pattern" to call one of three |
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* overloaded functions depending on whether the input and output |
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* images are the same dimension, the input is a higher dimension |
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* that the output, or the input is of a lower dimension than the |
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* output. The use of an overloaded function is required for proper |
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* compilation of the various cases. |
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* |
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* For the latter two cases, trivial implementations are used. If |
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* the input image is a higher dimension than the output, the first |
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* portion of the input region is copied to the output region. If |
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* the input region is a lower dimension than the output, the input |
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* region information is copied into the first portion of the output |
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* region and the rest of the output region is set to zero. |
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* |
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* If a filter needs a different default behavior, it can override |
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* this method. */ |
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virtual void CallCopyInputRegionToOutputRegion(OutputImageRegionType &destRegion, |
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const InputImageRegionType &srcRegion); |
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private: |
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ImageToImageFilter(const Self&); //purposely not implemented |
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void operator=(const Self&); //purposely not implemented |
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}; |
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#ifdef ITK_EXPLICIT_INSTANTIATION |
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***export template class ImageToImageFilter<Image<float ,2>, Image<float ,2> >; |
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***export template class ImageToImageFilter<Image<double ,2>, Image<double ,2> >; |
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***export template class ImageToImageFilter<Image<unsigned char ,2>, Image<unsigned char ,2> >; |
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***export template class ImageToImageFilter<Image<unsigned short,2>, Image<unsigned short,2> >; |
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***export template class ImageToImageFilter<Image<signed char ,2>, Image<signed char ,2> >; |
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***export template class ImageToImageFilter<Image<signed short ,2>, Image<signed short ,2> >; |
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***export template class ImageToImageFilter<Image<signed int ,2>, Image<signed int ,2> >; |
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***export template class ImageToImageFilter<Image<double ,2>, Image<float ,2> >; |
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***export template class ImageToImageFilter<Image<unsigned char ,2>, Image<float ,2> >; |
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***export template class ImageToImageFilter<Image<unsigned short,2>, Image<float ,2> >; |
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***export template class ImageToImageFilter<Image<signed char ,2>, Image<float ,2> >; |
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***export template class ImageToImageFilter<Image<signed short ,2>, Image<float ,2> >; |
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***export template class ImageToImageFilter<Image<float ,2>, Image<double ,2> >; |
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***export template class ImageToImageFilter<Image<float ,2>, Image<unsigned char ,2> >; |
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***export template class ImageToImageFilter<Image<float ,2>, Image<unsigned short,2> >; |
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***export template class ImageToImageFilter<Image<float ,2>, Image<signed char ,2> >; |
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***export template class ImageToImageFilter<Image<float ,2>, Image<signed short ,2> >; |
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***export template class ImageToImageFilter<Image<float ,3>, Image<float ,3> >; |
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***export template class ImageToImageFilter<Image<double ,3>, Image<double ,3> >; |
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***export template class ImageToImageFilter<Image<unsigned char ,3>, Image<unsigned char ,3> >; |
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***export template class ImageToImageFilter<Image<unsigned short,3>, Image<unsigned short,3> >; |
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***export template class ImageToImageFilter<Image<signed char ,3>, Image<signed char ,3> >; |
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***export template class ImageToImageFilter<Image<signed short ,3>, Image<signed short ,3> >; |
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***export template class ImageToImageFilter<Image<signed int ,3>, Image<signed int ,3> >; |
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***export template class ImageToImageFilter<Image<double ,3>, Image<float ,3> >; |
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***export template class ImageToImageFilter<Image<unsigned char ,3>, Image<float ,3> >; |
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***export template class ImageToImageFilter<Image<unsigned short,3>, Image<float ,3> >; |
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***export template class ImageToImageFilter<Image<signed char ,3>, Image<float ,3> >; |
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***export template class ImageToImageFilter<Image<signed short ,3>, Image<float ,3> >; |
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***export template class ImageToImageFilter<Image<float ,3>, Image<double ,3> >; |
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***export template class ImageToImageFilter<Image<float ,3>, Image<unsigned char ,3> >; |
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***export template class ImageToImageFilter<Image<float ,3>, Image<unsigned short,3> >; |
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***export template class ImageToImageFilter<Image<float ,3>, Image<signed char ,3> >; |
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***export template class ImageToImageFilter<Image<float ,3>, Image<signed short ,3> >; |
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#endif |
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} // end namespace itk |
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#ifndef ITK_MANUAL_INSTANTIATION |
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#include "itkImageToImageFilter.txx" |
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#endif |
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#endif |
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