void mitk::RegionGrowingTool::StartRegionGrowing(itk::Image<TPixel, imageDimension>* inputImage, itk::Index<imageDimension> seedIndex, std::array<ScalarType, 2> thresholds, mitk::Image::Pointer& outputImage)
{
MITK_DEBUG << "Starting region growing at index " << seedIndex << " with lower threshold " << thresholds[0] << " and upper threshold " << thresholds[1];
typedef itk::Image<TPixel, imageDimension> InputImageType;
typedef itk::Image<DefaultSegmentationDataType, imageDimension> OutputImageType;
typedef itk::ConnectedThresholdImageFilter<InputImageType, OutputImageType> RegionGrowingFilterType;
typename RegionGrowingFilterType::Pointer regionGrower = RegionGrowingFilterType::New();
// perform region growing in desired segmented region
regionGrower->SetInput(inputImage);
regionGrower->AddSeed(seedIndex);
regionGrower->SetLower(thresholds[0]);
regionGrower->SetUpper(thresholds[1]);
try
{
regionGrower->Update();
}
catch(...)
{
return; // Should we do something?
}
typename OutputImageType::Pointer resultImage = regionGrower->GetOutput();
// Smooth result: Every pixel is replaced by the majority of the neighborhood
typedef itk::NeighborhoodIterator<OutputImageType> NeighborhoodIteratorType;
typedef itk::ImageRegionIterator<OutputImageType> ImageIteratorType;
typename NeighborhoodIteratorType::RadiusType radius;
radius.Fill(2); // for now, maybe make this something the user can adjust in the preferences?
NeighborhoodIteratorType neighborhoodIterator(radius, resultImage, resultImage->GetRequestedRegion());
ImageIteratorType imageIterator(resultImage, resultImage->GetRequestedRegion());
for (neighborhoodIterator.GoToBegin(), imageIterator.GoToBegin(); !neighborhoodIterator.IsAtEnd(); ++neighborhoodIterator, ++imageIterator)
{
DefaultSegmentationDataType voteYes(0);
DefaultSegmentationDataType voteNo(0);
for (unsigned int i = 0; i < neighborhoodIterator.Size(); ++i)
{
if (neighborhoodIterator.GetPixel(i) > 0)
{
voteYes += 1;
}
else
{
voteNo += 1;
}
}
if (voteYes > voteNo)
{
imageIterator.Set(1);
}
else
{
imageIterator.Set(0);
}
}
if (resultImage.IsNull())
{
MITK_DEBUG << "Region growing result is empty.";
}
// Can potentially have multiple regions, use connected component image filter to label disjunct regions
typedef itk::ConnectedComponentImageFilter<OutputImageType, OutputImageType> ConnectedComponentImageFilterType;
typename ConnectedComponentImageFilterType::Pointer connectedComponentFilter = ConnectedComponentImageFilterType::New();
connectedComponentFilter->SetInput(resultImage);
connectedComponentFilter->Update();
typename OutputImageType::Pointer resultImageCC = connectedComponentFilter->GetOutput();
m_ConnectedComponentValue = resultImageCC->GetPixel(seedIndex);
outputImage = mitk::GrabItkImageMemory(resultImageCC);
}
void TractsToFiberEndingsImageFilter< OutputImageType >::GenerateData()
{
// generate upsampled image
mitk::Geometry3D::Pointer geometry = m_FiberBundle->GetGeometry();
typename OutputImageType::Pointer outImage = this->GetOutput();
// calculate new image parameters
mitk::Vector3D newSpacing;
mitk::Point3D newOrigin;
itk::Matrix<double, 3, 3> newDirection;
ImageRegion<3> upsampledRegion;
if (m_UseImageGeometry && !m_InputImage.IsNull())
{
newSpacing = m_InputImage->GetSpacing()/m_UpsamplingFactor;
upsampledRegion = m_InputImage->GetLargestPossibleRegion();
newOrigin = m_InputImage->GetOrigin();
typename OutputImageType::RegionType::SizeType size = upsampledRegion.GetSize();
size[0] *= m_UpsamplingFactor;
size[1] *= m_UpsamplingFactor;
size[2] *= m_UpsamplingFactor;
upsampledRegion.SetSize(size);
newDirection = m_InputImage->GetDirection();
}
else
{
newSpacing = geometry->GetSpacing()/m_UpsamplingFactor;
newOrigin = geometry->GetOrigin();
mitk::Geometry3D::BoundsArrayType bounds = geometry->GetBounds();
newOrigin[0] += bounds.GetElement(0);
newOrigin[1] += bounds.GetElement(2);
newOrigin[2] += bounds.GetElement(4);
for (int i=0; i<3; i++)
for (int j=0; j<3; j++)
newDirection[j][i] = geometry->GetMatrixColumn(i)[j];
upsampledRegion.SetSize(0, geometry->GetExtent(0)*m_UpsamplingFactor);
upsampledRegion.SetSize(1, geometry->GetExtent(1)*m_UpsamplingFactor);
upsampledRegion.SetSize(2, geometry->GetExtent(2)*m_UpsamplingFactor);
}
typename OutputImageType::RegionType::SizeType upsampledSize = upsampledRegion.GetSize();
// apply new image parameters
outImage->SetSpacing( newSpacing );
outImage->SetOrigin( newOrigin );
outImage->SetDirection( newDirection );
outImage->SetRegions( upsampledRegion );
outImage->Allocate();
int w = upsampledSize[0];
int h = upsampledSize[1];
int d = upsampledSize[2];
// set/initialize output
OutPixelType* outImageBufferPointer = (OutPixelType*)outImage->GetBufferPointer();
for (int i=0; i<w*h*d; i++)
outImageBufferPointer[i] = 0;
// resample fiber bundle
float minSpacing = 1;
if(newSpacing[0]<newSpacing[1] && newSpacing[0]<newSpacing[2])
minSpacing = newSpacing[0];
else if (newSpacing[1] < newSpacing[2])
minSpacing = newSpacing[1];
else
minSpacing = newSpacing[2];
vtkSmartPointer<vtkPolyData> fiberPolyData = m_FiberBundle->GetFiberPolyData();
vtkSmartPointer<vtkCellArray> vLines = fiberPolyData->GetLines();
vLines->InitTraversal();
int numFibers = m_FiberBundle->GetNumFibers();
boost::progress_display disp(numFibers);
for( int i=0; i<numFibers; i++ )
{
++disp;
vtkIdType numPoints(0);
vtkIdType* points(NULL);
vLines->GetNextCell ( numPoints, points );
// fill output image
if (numPoints>0)
{
itk::Point<float, 3> vertex = GetItkPoint(fiberPolyData->GetPoint(points[0]));
itk::Index<3> index;
outImage->TransformPhysicalPointToIndex(vertex, index);
if (m_BinaryOutput)
outImage->SetPixel(index, 1);
else
outImage->SetPixel(index, outImage->GetPixel(index)+1);
}
if (numPoints>2)
{
itk::Point<float, 3> vertex = GetItkPoint(fiberPolyData->GetPoint(points[numPoints-1]));
itk::Index<3> index;
outImage->TransformPhysicalPointToIndex(vertex, index);
if (m_BinaryOutput)
outImage->SetPixel(index, 1);
else
outImage->SetPixel(index, outImage->GetPixel(index)+1);
}
}
if (m_InvertImage)
for (int i=0; i<w*h*d; i++)
outImageBufferPointer[i] = 1-outImageBufferPointer[i];
}