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/*=========================================================================
Program: ITK-SNAP
Module: $RCSfile: EdgePreprocessingImageFilter.h,v $
Language: C++
Date: $Date: 2009/01/24 01:50:21 $
Version: $Revision: 1.4 $
Copyright (c) 2007 Paul A. Yushkevich
This file is part of ITK-SNAP
ITK-SNAP is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
-----
Copyright (c) 2003 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 __EdgePreprocessingFilter_h_
#define __EdgePreprocessingFilter_h_
#include "itkCommand.h"
#include "itkImageToImageFilter.h"
#include "EdgePreprocessingSettings.h"
#include "GPUSettings.h"
#ifdef SNAP_USE_GPU
#include "CPUImageToGPUImageFilter.h"
#include <itkGPUDiscreteGaussianImageFilter.h>
#endif
namespace itk {
template <class TIn, class TOut> class DiscreteGaussianImageFilter;
template <class TIn, class TOut> class GradientMagnitudeImageFilter;
template <class TIn, class TOut, class Fun> class UnaryFunctorImageFilter;
template <class TIn, class TOut> class StreamingImageFilter;
template <class TIn, class TOut> class CastImageFilter;
}
/**
* The g() function that remaps the gradient magnitude image to the
* range 0 to 1.
*/
template<class TInput>
class EdgeRemappingFunctor
{
public:
typedef EdgeRemappingFunctor<TInput> Self;
void SetParameters(float intensityMin, float intensityMax,
float exponent, float kappa)
{
m_KappaFactor = 1.0f / kappa;
m_Exponent = exponent;
m_IntensityBase = intensityMin;
m_IntensityScale = 1.0f / (intensityMax - intensityMin);
}
// This operator maps the input value into the range of short integers
inline short operator()(const TInput &x)
{
float xNorm = (static_cast<float>(x)-m_IntensityBase)*m_IntensityScale;
float y = 1.0 / (1.0 + pow(xNorm * m_KappaFactor,m_Exponent));
return static_cast<short> (y * 0x7fff);
}
bool operator ==(const Self &z)
{
return
m_KappaFactor == z.m_KappaFactor &&
m_IntensityBase == z.m_IntensityBase &&
m_IntensityScale == z.m_IntensityScale &&
m_Exponent == z.m_Exponent;
}
bool operator !=(const Self &z)
{ return !(*this == z); }
private:
float m_KappaFactor;
float m_IntensityBase;
float m_IntensityScale;
float m_Exponent;
};
/**
* \class EdgePreprocessingImageFilter
* \brief A filter used for edge preprocessing of images in the IRIS application.
*
* This functor implements a Gaussian blur, followed by a gradient magnitude
* operator, followed by a 'contrast enhancement' intensity remapping filter.
*/
template <typename TInputImage,typename TOutputImage>
class EdgePreprocessingImageFilter:
public itk::ImageToImageFilter<TInputImage,TOutputImage>
{
public:
/** Standard class typedefs. */
typedef EdgePreprocessingImageFilter Self;
typedef itk::ImageToImageFilter<TInputImage,TOutputImage> Superclass;
typedef itk::SmartPointer<Self> Pointer;
typedef itk::SmartPointer<const Self> ConstPointer;
/** Pixel Type of the input image */
typedef TInputImage InputImageType;
typedef typename InputImageType::PixelType InputPixelType;
typedef itk::SmartPointer<InputImageType> InputImagePointer;
/** Pixel Type of the output image */
typedef TOutputImage OutputImageType;
typedef itk::SmartPointer<OutputImageType> OutputImagePointer;
typedef typename Superclass::OutputImageRegionType
OutputImageRegionType;
/** Type used for internal calculations */
typedef float RealType;
typedef itk::Image<RealType,3> InternalImageType;
typedef itk::SmartPointer<InternalImageType> InternalImagePointer;
#ifdef SNAP_USE_GPU
typedef typename itk::GPUTraits<InternalImageType>::Type
GPUInternalImageType;
typedef itk::SmartPointer<GPUInternalImageType>
GPUInternalImagePointer;
#endif
/** Functor type used for thresholding */
typedef EdgeRemappingFunctor<RealType> FunctorType;
/** Method for creation through the object factory. */
itkNewMacro(Self)
/** Image dimension. */
itkStaticConstMacro(ImageDimension, unsigned int,
TInputImage::ImageDimension);
/** Assign new edge processing settings */
void SetParameters(EdgePreprocessingSettings *parameters);
/** Set the maximum possible value of the gradient magnitude of the input
image. This should be computed by applying a gradient magnitude filter
to the input image. Must be provided for the filter to work. */
itkSetMacro(InputImageMaximumGradientMagnitude, double)
/** Get the parameters pointer */
EdgePreprocessingSettings *GetParameters();
protected:
EdgePreprocessingImageFilter();
virtual ~EdgePreprocessingImageFilter() {}
void PrintSelf(std::ostream& os, itk::Indent indent) const;
/** Generate Data */
void GenerateData();
/**
* This method maps an input region to an output region. It's necessary to
* reflect the way this filter pads the requested region
*/
void GenerateInputRequestedRegion();
private:
double m_InputImageMaximumGradientMagnitude;
typedef itk::CastImageFilter<InputImageType, InternalImageType> CastFilter;
typedef itk::DiscreteGaussianImageFilter<InternalImageType,
InternalImageType> BlurFilter;
#ifdef SNAP_USE_GPU
typedef CPUImageToGPUImageFilter<GPUInternalImageType> GPUImageSource;
typedef itk::GPUDiscreteGaussianImageFilter<GPUInternalImageType,
GPUInternalImageType>
GPUBlurFilter;
#endif
typedef itk::GradientMagnitudeImageFilter<InternalImageType,
InternalImageType> GradMagFilter;
typedef itk::UnaryFunctorImageFilter<InternalImageType,
OutputImageType,
FunctorType> RemapFilter;
SmartPtr<CastFilter> m_CastFilter;
SmartPtr<BlurFilter> m_BlurFilter;
SmartPtr<GradMagFilter> m_GradMagFilter;
SmartPtr<RemapFilter> m_RemapFilter;
#ifdef SNAP_USE_GPU
SmartPtr<GPUImageSource> m_GPUImageSource;
SmartPtr<GPUBlurFilter> m_GPUBlurFilter;
#endif
};
#ifndef ITK_MANUAL_INSTANTIATION
#include "EdgePreprocessingImageFilter.txx"
#endif
#endif // __EdgePreprocessingFilter_h_
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