bool mitk::CorrectorAlgorithm::ImprovedHeimannCorrectionAlgorithm(itk::Image< ipMITKSegmentationTYPE, 2 >::Pointer pic)
{
/*!
Some documentation (not by the original author)
TobiasHeimannCorrectionAlgorithm will be called, when the user has finished drawing a freehand line.
There should be different results, depending on the line's properties:
1. Without any prior segmentation, the start point and the end point of the drawn line will be
connected to a contour and the area enclosed by the contour will be marked as segmentation.
2. When the whole line is inside a segmentation, start and end point will be connected to
a contour and the area of this contour will be subtracted from the segmentation.
3. When the line starts inside a segmentation and ends outside with only a single
transition from segmentation to no-segmentation, nothing will happen.
4. When there are multiple transitions between inside-segmentation and
outside-segmentation, the line will be divided in so called segments. Each segment is
either fully inside or fully outside a segmentation. When it is inside a segmentation, its
enclosed area will be subtracted from the segmentation. When the segment is outside a
segmentation, its enclosed area it will be added to the segmentation.
The algorithm is described in full length in Tobias Heimann's diploma thesis
(MBI Technical Report 145, p. 37 - 40).
*/
ContourModel::Pointer projectedContour = mitk::ContourModelUtils::ProjectContourTo2DSlice( m_WorkingImage, m_Contour, true, false );
bool firstPointIsFillingColor = false;
if (projectedContour.IsNull() ||
projectedContour->GetNumberOfVertices() < 2 )
{
return false;
}
// Read the first point of the contour
ContourModel::VertexIterator contourIter = projectedContour->Begin();
if (contourIter == projectedContour->End())
return false;
itk::Index<2> previousIndex;
previousIndex[0] = (*contourIter)->Coordinates[0];
previousIndex[1] = (*contourIter)->Coordinates[1];
++contourIter;
int currentColor = ( pic->GetPixel(previousIndex) == m_FillColor);
firstPointIsFillingColor = currentColor;
TSegData currentSegment;
int countOfSegments = 1;
bool firstSegment = true;
ContourModel::VertexIterator contourEnd = projectedContour->End();
for (; contourIter != contourEnd; ++contourIter)
{
// Get current point
itk::Index<2> currentIndex;
currentIndex[0] = (*contourIter)->Coordinates[0] +0.5;
currentIndex[1] = (*contourIter)->Coordinates[1] +0.5;
// Calculate length and slope
double slopeX = currentIndex[0] - previousIndex[0];
double slopeY = currentIndex[1] - previousIndex[1];
double length = std::sqrt(slopeX * slopeX + slopeY * slopeY);
double deltaX = slopeX / length;
double deltaY = slopeY / length;
for (double i = 0; i <= length && length > 0; i+=1)
{
itk::Index<2> temporaryIndex;
temporaryIndex[0] = previousIndex[0] + deltaX * i;
temporaryIndex[1] = previousIndex[1] + deltaY * i;
if ( ! pic->GetLargestPossibleRegion().IsInside(temporaryIndex))
continue;
if ( (pic->GetPixel(temporaryIndex) == m_FillColor) != currentColor)
{
currentSegment.points.push_back(temporaryIndex);
if ( ! firstSegment)
{
ModifySegment( currentSegment, pic);
} else
{
firstSegment = false;
}
currentSegment = TSegData();
++countOfSegments;
currentColor = (pic->GetPixel(temporaryIndex) == m_FillColor);
}
currentSegment.points.push_back(temporaryIndex);
}
previousIndex = currentIndex;
}
// Check if only on Segment
if (firstSegment && currentSegment.points.size() > 0)
{
ContourModel::Pointer projectedContour = mitk::ContourModelUtils::ProjectContourTo2DSlice( m_WorkingImage, m_Contour, true, false );
projectedContour->Close();
if (firstPointIsFillingColor)
{
ContourModelUtils::FillContourInSlice(projectedContour, 0, m_WorkingImage, m_EraseColor);
} else
{
ContourModelUtils::FillContourInSlice(projectedContour, 0, m_WorkingImage, m_FillColor);
}
}
return true;
}
/**
Insert the point to the feedback contour,finish to build the contour and at the same time the painting function
*/
void mitk::PaintbrushTool::MouseMoved(mitk::InteractionEvent* interactionEvent, bool leftMouseButtonPressed)
{
mitk::InteractionPositionEvent* positionEvent = dynamic_cast<mitk::InteractionPositionEvent*>( interactionEvent );
CheckIfCurrentSliceHasChanged( positionEvent );
if ( m_LastContourSize != m_Size )
{
UpdateContour( positionEvent );
m_LastContourSize = m_Size;
}
Point3D worldCoordinates = positionEvent->GetPositionInWorld();
Point3D indexCoordinates;
m_WorkingSlice->GetGeometry()->WorldToIndex( worldCoordinates, indexCoordinates );
MITK_DEBUG << "Mouse at W " << worldCoordinates << std::endl;
MITK_DEBUG << "Mouse at I " << indexCoordinates << std::endl;
// round to nearest voxel center (abort if this hasn't changed)
if ( m_Size % 2 == 0 ) // even
{
indexCoordinates[0] = ROUND( indexCoordinates[0]);// /*+ 0.5*/) + 0.5;
indexCoordinates[1] = ROUND( indexCoordinates[1]);// /*+ 0.5*/ ) + 0.5;
}
else // odd
{
indexCoordinates[0] = ROUND( indexCoordinates[0] ) ;
indexCoordinates[1] = ROUND( indexCoordinates[1] ) ;
}
static Point3D lastPos; // uninitialized: if somebody finds out how this can be initialized in a one-liner, tell me
if ( fabs(indexCoordinates[0] - lastPos[0]) > mitk::eps ||
fabs(indexCoordinates[1] - lastPos[1]) > mitk::eps ||
fabs(indexCoordinates[2] - lastPos[2]) > mitk::eps ||
leftMouseButtonPressed
)
{
lastPos = indexCoordinates;
}
else
{
MITK_DEBUG << "." << std::flush;
return;
}
MITK_DEBUG << "Mouse at C " << indexCoordinates;
int timestep = positionEvent->GetSender()->GetTimeStep();
ContourModel::Pointer contour = ContourModel::New();
contour->Expand(timestep + 1);
contour->SetClosed(true, timestep);
ContourModel::VertexIterator it = m_MasterContour->Begin();
ContourModel::VertexIterator end = m_MasterContour->End();
while(it != end)
{
Point3D point = (*it)->Coordinates;
point[0] += indexCoordinates[ 0 ];
point[1] += indexCoordinates[ 1 ];
contour->AddVertex( point, timestep );
it++;
}
if (leftMouseButtonPressed)
{
FeedbackContourTool::FillContourInSlice( contour, timestep, m_WorkingSlice, m_PaintingPixelValue );
m_WorkingNode->SetData(m_WorkingSlice);
m_WorkingNode->Modified();
}
// visualize contour
ContourModel::Pointer displayContour = this->GetFeedbackContour();
displayContour->Clear();
ContourModel::Pointer tmp = FeedbackContourTool::BackProjectContourFrom2DSlice( m_WorkingSlice->GetGeometry(), /*displayContour*/contour );
// copy transformed contour into display contour
it = tmp->Begin();
end = tmp->End();
while(it != end)
{
Point3D point = (*it)->Coordinates;
displayContour->AddVertex( point, timestep );
it++;
}
m_FeedbackContourNode->GetData()->Modified();
assert( positionEvent->GetSender()->GetRenderWindow() );
RenderingManager::GetInstance()->RequestUpdate( positionEvent->GetSender()->GetRenderWindow() );
}
