VTKPNGWriter打印出黑色图像？

我正在使用ITK进行一些图像处理，然后使用VTK以.png格式打印结果，但输出图像始终为黑色。VTKPNGWriter打印出黑色图像？

目前，我使用itk :: ImagetoVTKImageFilter（typedeffed to ITKtoVTKFilterType in the code）将itk :: Image转换为vtk :: vtkImageData。

ITKtoVTKFilterType::Pointer itk2vtkGray = ITKtoVTKFilterType::New(); 
itk2vtkGray->SetInput(grayBinary); //grayBinary is of type itk::Image<unsigned short, 2> 
itk2vtkGray->Update(); 

vtkSmartPointer<vtkImageData> grayVTK = vtkSmartPointer<vtkImageData>::New(); 
grayVTK->SetExtent(extent); 
grayVTK->SetSpacing(m_spacing); 
grayVTK->SetScalarTypeToUnsignedShort(); 
grayVTK->SetNumberOfScalarComponents(1); 
grayVTK->AllocateScalars(); 
grayVTK->DeepCopy(static_cast<vtkImageData*>(itk2vtkGray->GetOutput())); 
//grayVTK = itk2vtkGray->GetOutput();

我甚至使用下面的代码证实我的VTK ImageData包含值为255或0。

int *dims = grayVTK->GetDimensions(); 

std::cout << "Dims: " << " x: " << dims[0] << " y: " << dims[1] << " z: " << dims[2] << std::endl; 
std::cout << "Number of points: " << grayVTK->GetNumberOfPoints() << std::endl; 
std::cout << "Number of cells: " << grayVTK->GetNumberOfCells() << std::endl; 

for (int y = 0; y < dims[1]; y++) 
{   
    for (int x = 0; x < dims[0]; x++) 
    { 
     unsigned short *pixel = static_cast<unsigned short*>(grayVTK->GetScalarPointer(x,y,0)); 
     std::cout << "PIXEL LOC/VAL "<< y*dims[0] + x << " " << pixel[0] <<std::endl; 
    } 
    std::cout << std::endl; 
}

然后我继续做一个ImageCast，以确保数据的类型是unsignedShort的。

vtkSmartPointer<vtkImageCast> cast2 = vtkSmartPointer<vtkImageCast>::New(); 
cast2->SetInput(grayVTK); 
cast2->SetOutputScalarTypeToUnsignedShort(); 
cast2->ClampOverflowOn(); 
cast2->Update();

然后最后我用vtkPNGwriter输出.png文件。请注意，我试图输出实际的vtkImageData以及ImageCastFilter的输出。

vtkSmartPointer<vtkPNGWriter> writer = 
vtkSmartPointer<vtkPNGWriter>::New(); 
writer->SetFileName(filename.toStdString().c_str()); 
writer->SetInputConnection(cast2->GetOutputPort()); 
//writer->SetInput(grayVTK); I have tried to method as well but to no success 
writer->Write();

但是，.png输出始终为黑色。有谁知道我做错了什么。

来源

2013-03-27 user1084113

也许，问题出在图书馆的一个/你VTK建？如果你编译并运行这个例子 - http://www.vtk.org/Wiki/VTK/Examples/Cxx/IO/WritePNG，它是否按预期工作？ – 2013-03-28 18:05:46

为什么不使用itImageFileWriter来编写PNG？ – 2013-05-13 20:33:57

以供将来参考，似乎有很多读者PNG不显示16个数据。因此，我在最后做的没有签名的演员阵容应该是焦点。

vtkSmartPointer<vtkImageCast> cast2 = vtkSmartPointer<vtkImageCast>::New(); 
cast2->SetInput(grayVTK); 
cast2->SetOutputScalarTypeToChar(); 
cast2->ClampOverflowOn(); 
cast2->Update();

来源

2013-03-28 20:50:07 user1084113

感谢它解决了我的问题！ – 2013-04-24 11:28:54

VTKPNGWriter打印出黑色图像？

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