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/*=========================================================================
Program: ORFEO Toolbox
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) Centre National d'Etudes Spatiales. All rights reserved.
See OTBCopyright.txt 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 otbScalarImageToPanTexTextureFilter_txx
#define otbScalarImageToPanTexTextureFilter_txx
#include "otbScalarImageToPanTexTextureFilter.h"
#include "itkImageRegionIteratorWithIndex.h"
#include "itkConstNeighborhoodIterator.h"
#include "itkImageRegionIterator.h"
#include "itkProgressReporter.h"
#include "itkNumericTraits.h"
namespace otb
{
template <class TInputImage, class TOutputImage>
ScalarImageToPanTexTextureFilter<TInputImage, TOutputImage>
::ScalarImageToPanTexTextureFilter() : m_Radius(),
m_NumberOfBinsPerAxis(8),
m_InputImageMinimum(0),
m_InputImageMaximum(255)
{
// There are 1 output corresponding to the Pan Tex texture indice
this->SetNumberOfRequiredOutputs(1);
//Fill the offset list for contrast computation
OffsetType off;
off[0] = 0;
off[1] = 1;
m_OffsetList.push_back(off); //(0, 1)
off[1] = 2;
m_OffsetList.push_back(off); //(0, 2)
off[0] = 1;
off[1] = -2;
m_OffsetList.push_back(off); //(1, -2)
off[1] = -1;
m_OffsetList.push_back(off); //(1, -1)
off[1] = 0;
m_OffsetList.push_back(off); //(1, 0)
off[1] = 1;
m_OffsetList.push_back(off); //(1, 1)
off[1] = 2;
m_OffsetList.push_back(off); //(1, 2)
off[0] = 2;
off[1] = -1;
m_OffsetList.push_back(off); //(2, -1)
off[1] = 0;
m_OffsetList.push_back(off); //(2, 0)
off[1] = 1;
m_OffsetList.push_back(off); //(2, 1)
}
template <class TInputImage, class TOutputImage>
ScalarImageToPanTexTextureFilter<TInputImage, TOutputImage>
::~ScalarImageToPanTexTextureFilter()
{}
template <class TInputImage, class TOutputImage>
void
ScalarImageToPanTexTextureFilter<TInputImage, TOutputImage>
::GenerateInputRequestedRegion()
{
// First, call superclass implementation
Superclass::GenerateInputRequestedRegion();
// Retrieve the input and output pointers
InputImagePointerType inputPtr = const_cast<InputImageType *>(this->GetInput());
OutputImagePointerType outputPtr = this->GetOutput();
if (!inputPtr || !outputPtr)
{
return;
}
// Retrieve the output requested region
// We use only the first output since requested regions for all outputs are enforced to be equal
// by the default GenerateOutputRequestedRegiont() implementation
OutputRegionType outputRequestedRegion = outputPtr->GetRequestedRegion();
// Build the input requested region
InputRegionType inputRequestedRegion = outputRequestedRegion;
// Apply the radius
SizeType maxOffsetSize;
maxOffsetSize[0] = 2;
maxOffsetSize[1] = 2;
inputRequestedRegion.PadByRadius(m_Radius + maxOffsetSize);
// Try to apply the requested region to the input image
if (inputRequestedRegion.Crop(inputPtr->GetLargestPossibleRegion()))
{
inputPtr->SetRequestedRegion(inputRequestedRegion);
}
else
{
// Build an exception
itk::InvalidRequestedRegionError e(__FILE__, __LINE__);
e.SetLocation(ITK_LOCATION);
e.SetDescription("Requested region is (at least partially) outside the largest possible region.");
e.SetDataObject(inputPtr);
throw e;
}
}
template <class TInputImage, class TOutputImage>
void
ScalarImageToPanTexTextureFilter<TInputImage, TOutputImage>
::ThreadedGenerateData(const OutputRegionType& outputRegionForThread, itk::ThreadIdType threadId)
{
// Retrieve the input and output pointers
InputImagePointerType inputPtr = const_cast<InputImageType *> (this->GetInput());
OutputImagePointerType outputPtr = this->GetOutput();
itk::ImageRegionIteratorWithIndex<OutputImageType> outputIt(outputPtr, outputRegionForThread);
// Go to begin
outputIt.GoToBegin();
// Set-up progress reporting
itk::ProgressReporter progress(this, threadId, outputRegionForThread.GetNumberOfPixels());
// Iterate on outputs to compute textures
while (!outputIt.IsAtEnd())
{
// Initialise output value
double out = itk::NumericTraits<double>::max();
// For each offset
typename OffsetListType::const_iterator offIt;
for (offIt = m_OffsetList.begin(); offIt != m_OffsetList.end(); ++offIt)
{
OffsetType currentOffset = *offIt;
// Compute the region on which co-occurence will be estimated
typename InputRegionType::IndexType inputIndex;
typename InputRegionType::SizeType inputSize;
// First, create an window for neighborhood iterator based on m_Radius
// For example, if xradius and yradius is 2. window size is 5x5 (2 *
// radius + 1).
for (unsigned int dim = 0; dim < InputImageType::ImageDimension; ++dim)
{
inputIndex[dim] = outputIt.GetIndex()[dim] - m_Radius[dim];
inputSize[dim] = 2 * m_Radius[dim] + 1;
}
// Build the input region
InputRegionType inputRegion;
inputRegion.SetIndex(inputIndex);
inputRegion.SetSize(inputSize);
inputRegion.Crop(inputPtr->GetRequestedRegion());
SizeType neighborhoodRadius;
/** calculate minimum offset and set it as neighborhood radius **/
unsigned int minRadius = 0;
for ( unsigned int i = 0; i < currentOffset.GetOffsetDimension(); i++ )
{
unsigned int distance = vcl_abs(currentOffset[i]);
if ( distance > minRadius )
{
minRadius = distance;
}
}
neighborhoodRadius.Fill(minRadius);
CooccurrenceIndexedListPointerType GLCIList = CooccurrenceIndexedListType::New();
GLCIList->Initialize(m_NumberOfBinsPerAxis, m_InputImageMinimum, m_InputImageMaximum);
typedef itk::ConstNeighborhoodIterator< InputImageType > NeighborhoodIteratorType;
NeighborhoodIteratorType neighborIt;
neighborIt = NeighborhoodIteratorType(neighborhoodRadius, inputPtr, inputRegion);
for ( neighborIt.GoToBegin(); !neighborIt.IsAtEnd(); ++neighborIt )
{
const InputPixelType centerPixelIntensity = neighborIt.GetCenterPixel();
bool pixelInBounds;
const InputPixelType pixelIntensity = neighborIt.GetPixel(currentOffset, pixelInBounds);
if ( !pixelInBounds )
{
continue; // don't put a pixel in the histogram if it's out-of-bounds.
}
GLCIList->AddPixelPair(centerPixelIntensity, pixelIntensity);
}
VectorConstIteratorType constVectorIt;
VectorType glcVector = GLCIList->GetVector();
double totalFrequency = static_cast<double> (GLCIList->GetTotalFrequency());
//Compute inertia aka contrast
double inertia = 0;
constVectorIt = glcVector.begin();
while( constVectorIt != glcVector.end())
{
CooccurrenceIndexType index = (*constVectorIt).first;
RelativeFrequencyType frequency = (*constVectorIt).second / totalFrequency;
inertia += ( index[0] - index[1] ) * ( index[0] - index[1] ) * frequency;
++constVectorIt;
}
if (inertia < out)
{
out = inertia;
}
}
outputIt.Set(out);
++outputIt;
progress.CompletedPixel();
}
}
} // End namespace otb
#endif
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