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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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.
*
*=========================================================================*/
#ifndef itkPolylineMask2DImageFilter_hxx
#define itkPolylineMask2DImageFilter_hxx
#include "itkLineIterator.h"
#include "itkImageLinearIteratorWithIndex.h"
#include "itkPathIterator.h"
#include "itkImageRegionIterator.h"
#include "itkProgressReporter.h"
#include "itkVectorContainer.h"
namespace itk
{
template <typename TInputImage, typename TPolyline, typename TOutputImage>
PolylineMask2DImageFilter<TInputImage, TPolyline, TOutputImage>::PolylineMask2DImageFilter()
{
this->SetNumberOfRequiredInputs(2);
}
template <typename TInputImage, typename TPolyline, typename TOutputImage>
void
PolylineMask2DImageFilter<TInputImage, TPolyline, TOutputImage>::SetInput1(const TInputImage * input)
{
// Process object is not const-correct so the const_cast is required here
this->ProcessObject::SetNthInput(0, const_cast<TInputImage *>(input));
}
template <typename TInputImage, typename TPolyline, typename TOutputImage>
void
PolylineMask2DImageFilter<TInputImage, TPolyline, TOutputImage>::SetInput2(const TPolyline * input)
{
// Process object is not const-correct so the const_cast is required here
this->ProcessObject::SetNthInput(1, const_cast<TPolyline *>(input));
}
template <typename TInputImage, typename TPolyline, typename TOutputImage>
void
PolylineMask2DImageFilter<TInputImage, TPolyline, TOutputImage>::GenerateData()
{
using LineIteratorType = LineIterator<TOutputImage>;
using ImageLineIteratorType = ImageLinearIteratorWithIndex<TOutputImage>;
using InputImageConstIteratorType = ImageRegionConstIterator<TInputImage>;
using ImageIndexType = typename TOutputImage::IndexType;
using PixelType = typename TOutputImage::PixelType;
using OutputImageIteratorType = ImageRegionIterator<TOutputImage>;
using VertexType = typename TPolyline::VertexType;
using VertexListType = typename TPolyline::VertexListType;
typename TInputImage::ConstPointer inputImagePtr(dynamic_cast<const TInputImage *>(this->ProcessObject::GetInput(0)));
typename TPolyline::ConstPointer polylinePtr(dynamic_cast<const TPolyline *>(this->ProcessObject::GetInput(1)));
typename TOutputImage::Pointer outputImagePtr(dynamic_cast<TOutputImage *>(this->ProcessObject::GetOutput(0)));
outputImagePtr->SetOrigin(inputImagePtr->GetOrigin());
outputImagePtr->SetSpacing(inputImagePtr->GetSpacing());
outputImagePtr->SetDirection(inputImagePtr->GetDirection());
outputImagePtr->SetRequestedRegion(inputImagePtr->GetRequestedRegion());
outputImagePtr->SetBufferedRegion(inputImagePtr->GetBufferedRegion());
outputImagePtr->SetLargestPossibleRegion(inputImagePtr->GetLargestPossibleRegion());
outputImagePtr->Allocate();
const VertexListType * container = polylinePtr->GetVertexList();
typename VertexListType::ConstIterator piter = container->Begin();
/* Rasterize each polyline segment using bresenham line iterator */
VertexType startVertex;
VertexType endVertex;
VertexType pstartVertex;
VertexType tmpVertex;
/* Check if the polyline coordinates are within the input image */
while (piter != container->End())
{
tmpVertex = piter.Value();
const auto tmpIndex = outputImagePtr->TransformPhysicalPointToIndex(tmpVertex);
if (!outputImagePtr->GetBufferedRegion().IsInside(tmpIndex))
{
itkExceptionMacro("Polyline vertex is out of bounds (Vertex,Index): " << tmpVertex << ", " << tmpIndex);
}
++piter;
}
// reset piter
piter = container->Begin();
/* define flag to indicate the line segment slope */
bool pflag;
/* define background, foreground pixel values and unlabeled pixel value */
PixelType zero_val{};
auto u_val = static_cast<PixelType>(0);
auto b_val = static_cast<PixelType>(2);
auto f_val = static_cast<PixelType>(255);
outputImagePtr->FillBuffer(u_val);
pstartVertex = piter.Value();
tmpVertex = pstartVertex;
++piter;
ImageIndexType tmpImageIndex;
tmpImageIndex.Fill(0);
ImageLineIteratorType imit(outputImagePtr, outputImagePtr->GetLargestPossibleRegion());
imit.SetDirection(0);
itkDebugMacro("Generating the mask defined by the polyline.....");
while (piter != container->End())
{
pflag = false;
startVertex = tmpVertex;
endVertex = piter.Value();
const auto startImageIndex = outputImagePtr->TransformPhysicalPointToIndex(startVertex);
const auto endImageIndex = outputImagePtr->TransformPhysicalPointToIndex(endVertex);
// itkDebugMacro(<<"Projection image (index,physical
// coordinate):"<<startImageIndex<<","<<startVertex<<std::endl);
if (endImageIndex[1] > startImageIndex[1])
{
pflag = true;
}
LineIteratorType it(outputImagePtr, startImageIndex, endImageIndex);
it.GoToBegin();
while (!it.IsAtEnd())
{
tmpImageIndex[0] = it.GetIndex()[0];
tmpImageIndex[1] = it.GetIndex()[1];
// initialize imit using it
imit.SetIndex(tmpImageIndex);
while (!imit.IsAtEndOfLine())
{
if (pflag)
{
if (imit.Get() == u_val)
{
imit.Set(f_val);
}
}
else
{
imit.Set(b_val);
}
++imit;
}
++it;
}
tmpVertex = endVertex;
++piter;
}
/* Close the polygon */
pflag = false;
startVertex = tmpVertex;
endVertex = pstartVertex;
const auto startImageIndex = outputImagePtr->TransformPhysicalPointToIndex(startVertex);
const auto endImageIndex = outputImagePtr->TransformPhysicalPointToIndex(endVertex);
if (endImageIndex[1] > startImageIndex[1])
{
pflag = true;
}
LineIteratorType it(outputImagePtr, startImageIndex, endImageIndex);
while (!it.IsAtEnd())
{
tmpImageIndex[0] = it.GetIndex()[0];
tmpImageIndex[1] = it.GetIndex()[1];
// initialize imit using it
imit.SetIndex(tmpImageIndex);
while (!imit.IsAtEndOfLine())
{
if (pflag)
{
if (imit.Get() == u_val)
{
imit.Set(f_val);
}
}
else
{
imit.Set(b_val);
}
++imit;
}
++it;
}
/* Mask the input image with the mask generated */
InputImageConstIteratorType inputI(inputImagePtr, inputImagePtr->GetLargestPossibleRegion());
OutputImageIteratorType outputI(outputImagePtr, outputImagePtr->GetLargestPossibleRegion());
while (!outputI.IsAtEnd())
{
if (outputI.Get() == f_val)
{
outputI.Set(inputI.Get());
}
else
{
outputI.Set(zero_val);
}
++inputI;
++outputI;
}
}
} // end namespace itk
#endif
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