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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.
*
*=========================================================================*/
/*=========================================================================
*
* Portions of this file are subject to the VTK Toolkit Version 3 copyright.
*
* Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
*
* For complete copyright, license and disclaimer of warranty information
* please refer to the NOTICE file at the top of the ITK source tree.
*
*=========================================================================*/
#ifndef itkThresholdImageFilter_hxx
#define itkThresholdImageFilter_hxx
#include "itkThresholdImageFilter.h"
#include "itkImageScanlineIterator.h"
#include "itkNumericTraits.h"
#include "itkObjectFactory.h"
#include "itkProgressReporter.h"
#include "itkMacro.h"
#include "itkMath.h"
namespace itk
{
/**
*
*/
template< typename TImage >
ThresholdImageFilter< TImage >
::ThresholdImageFilter()
{
m_OutsideValue = NumericTraits< PixelType >::ZeroValue();
m_Lower = NumericTraits< PixelType >::NonpositiveMin();
m_Upper = NumericTraits< PixelType >::max();
this->InPlaceOff();
}
/**
*
*/
template< typename TImage >
void
ThresholdImageFilter< TImage >
::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "OutsideValue: "
<< static_cast< typename NumericTraits< PixelType >::PrintType >( m_OutsideValue )
<< std::endl;
os << indent << "Lower: "
<< static_cast< typename NumericTraits< PixelType >::PrintType >( m_Lower )
<< std::endl;
os << indent << "Upper: "
<< static_cast< typename NumericTraits< PixelType >::PrintType >( m_Upper )
<< std::endl;
}
/**
* The values greater than the threshold value are set to OutsideValue
*/
template< typename TImage >
void
ThresholdImageFilter< TImage >
::ThresholdAbove(const PixelType & thresh)
{
if ( Math::NotExactlyEquals(m_Upper, thresh)
|| m_Lower > NumericTraits< PixelType >::NonpositiveMin() )
{
m_Lower = NumericTraits< PixelType >::NonpositiveMin();
m_Upper = thresh;
this->Modified();
}
}
/**
* The values less than the threshold value are set to OutsideValue
*/
template< typename TImage >
void
ThresholdImageFilter< TImage >
::ThresholdBelow(const PixelType & thresh)
{
if ( Math::NotExactlyEquals(m_Lower, thresh) || m_Upper < NumericTraits< PixelType >::max() )
{
m_Lower = thresh;
m_Upper = NumericTraits< PixelType >::max();
this->Modified();
}
}
/**
* The values outside the threshold range (less than lower or greater than upper) are set to OutsideValue
*/
template< typename TImage >
void
ThresholdImageFilter< TImage >
::ThresholdOutside(const PixelType & lower, const PixelType & upper)
{
if ( lower > upper )
{
itkExceptionMacro(<< "Lower threshold cannot be greater than upper threshold.");
return;
}
if ( Math::NotExactlyEquals(m_Lower, lower) || Math::NotExactlyEquals(m_Upper, upper) )
{
m_Lower = lower;
m_Upper = upper;
this->Modified();
}
}
/**
*
*/
template< typename TImage >
void
ThresholdImageFilter< TImage >
::ThreadedGenerateData(const OutputImageRegionType & outputRegionForThread,
ThreadIdType threadId)
{
const SizeValueType size0 = outputRegionForThread.GetSize(0);
if( size0 == 0)
{
return;
}
itkDebugMacro(<< "Actually executing");
// Get the input and output pointers
InputImagePointer inputPtr = this->GetInput();
OutputImagePointer outputPtr = this->GetOutput(0);
// Define/declare an iterator that will walk the output region for this
// thread.
typedef ImageScanlineConstIterator< TImage > InputIterator;
typedef ImageScanlineIterator< TImage > OutputIterator;
InputIterator inIt(inputPtr, outputRegionForThread);
OutputIterator outIt(outputPtr, outputRegionForThread);
// support progress methods/callbacks
const size_t numberOfLinesToProcess = outputRegionForThread.GetNumberOfPixels() / size0;
ProgressReporter progress( this, threadId, static_cast<SizeValueType>( numberOfLinesToProcess ) );
// walk the regions, threshold each pixel
while ( !outIt.IsAtEnd() )
{
while ( !outIt.IsAtEndOfLine() )
{
const PixelType value = inIt.Get();
if ( m_Lower <= value && value <= m_Upper )
{
// pixel passes to output unchanged and is replaced by m_OutsideValue in
// the inverse output image
outIt.Set( inIt.Get() );
}
else
{
outIt.Set(m_OutsideValue);
}
++inIt;
++outIt;
}
inIt.NextLine();
outIt.NextLine();
progress.CompletedPixel();
}
}
} // end namespace itk
#endif
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