[vtkusers] smoothen binarized vtkImageData

[Ang]

I want to smoothen binarized vtkImageData like image below from right to left
<http://vtk.1045678.n5.nabble.com/file/t281986/123132.png> 

I followed
https://stackoverflow.com/questions/45365727/vtk-volume-visualization-issue
and had results like below
<http://vtk.1045678.n5.nabble.com/file/t281986/22222.png> 

Then I tried using linear interpolation, the colors turned to be abnormal

<http://vtk.1045678.n5.nabble.com/file/t281986/33333.png> 

Below are my code pieces:

//Declaring Variables
	vtkSmartPointer<vtkVolumeProperty> volumeProperty;
	vtkSmartPointer<vtkPiecewiseFunction> compositeOpacity;
	vtkSmartPointer<vtkColorTransferFunction> color;
	vtkSmartPointer<vtkVolume> volume;
	vtkGPUVolumeRayCastMapper* mapper = vtkGPUVolumeRayCastMapper::New();
	
	volumeProperty = vtkSmartPointer<vtkVolumeProperty>::New();
	compositeOpacity = vtkSmartPointer<vtkPiecewiseFunction>::New();
	color = vtkSmartPointer<vtkColorTransferFunction>::New();
	volume = vtkSmartPointer<vtkVolume>::New();

	mapper->SetAutoAdjustSampleDistances(0);
	
	double spacing[3];
	m_RegionImageData->GetSpacing(spacing);
	

	double distance = spacing[0];
	if (distance>spacing[1])
	{
		distance = spacing[1];
	}
	if (distance>spacing[2])
	{
		distance = spacing[2];
	}
	distance = distance / 2.0;



	mapper->SetSampleDistance(static_cast<float>(distance));
	volumeProperty->ShadeOn();
	volumeProperty->SetIndependentComponents(1);
	volumeProperty->SetInterpolationTypeToLinear();
	volumeProperty->SetColor(color);
	volumeProperty->SetScalarOpacity(compositeOpacity);
    mapper->SetBlendModeToComposite();
	m_RegionImageData->UpdateCellGhostArrayCache();
	mapper->SetInputData(m_ReigonGrowing->m_RegionImageData);
	mapper->SetMaskTypeToLabelMap();
	mapper->SetMaskBlendFactor(0.8);
	volume->SetMapper(mapper);
	volume->SetProperty(volumeProperty);
	m_cImage3DViewer->getRenderer()->AddViewProp(volume);
	//Setting Voxel Data and Its Properties
	compositeOpacity->AddPoint(0, 0);
	for (int i = 1; i <
m_ReigonGrowing->m_lookupTable->GetNumberOfTableValues(); i++)
	{
	
		compositeOpacity->AddPoint(i, 1);
		color->AddRGBPoint(i, m_ReigonGrowing->m_lookupTable->GetTableValue(i)[0],
m_ReigonGrowing->m_lookupTable->GetTableValue(i)[1],
m_ReigonGrowing->m_lookupTable->GetTableValue(i)[2]);
	}

	m_cImage3DViewer->getRenderer()->ResetCamera();
	

/*m_cImage3DViewer->assignImageToVolume(m_pProjectData->GetActivePatientData()->GetOriginImageDataPtr(),
m_cImage3DViewer->m_k3DLUT);
	
	StartAdjustCropRegionWidget();*/

m_cImage3DViewer->getRenderer()->GetRenderWindow()->GetInteractor()->Render();

Does anyone has any ways to smoothen binarized vtkImageData? 



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