1.彩色图像RGB成分提取

VTK中利用vtkImageExtractComponents可以方便的提取出彩色图像的各个颜色分量，该类的使用比较简单，只需要设置要提取的分量序号即可。下面代码说明了怎样提取彩色图像的某个颜色分量。

  1 #include <vtkAutoInit.h>
  2 VTK_MODULE_INIT(vtkRenderingOpenGL);
  3  
  4 #include <vtkSmartPointer.h>
  5 #include <vtkBMPReader.h>
  6 #include <vtkImageExtractComponents.h>
  7 #include <vtkImageActor.h>
  8 #include <vtkRenderer.h>
  9 #include <vtkRenderWindow.h>
 10 #include <vtkRenderWindowInteractor.h>
 11 #include <vtkInteractorStyleImage.h>
 12  
 13 int main()
 14 {
 15     vtkSmartPointer<vtkBMPReader> reader =
 16         vtkSmartPointer<vtkBMPReader>::New();
 17     reader->SetFileName("lena.bmp");
 18  
 19     vtkSmartPointer<vtkImageExtractComponents> redComponent =
 20         vtkSmartPointer<vtkImageExtractComponents>::New();
 21     redComponent->SetInputConnection(reader->GetOutputPort());
 22     redComponent->SetComponents(0);
 23     redComponent->Update();
 24  
 25     vtkSmartPointer<vtkImageExtractComponents> greenComponent =
 26         vtkSmartPointer<vtkImageExtractComponents>::New();
 27     greenComponent->SetInputConnection(reader->GetOutputPort());
 28     greenComponent->SetComponents(1);
 29     greenComponent->Update();
 30  
 31     vtkSmartPointer<vtkImageExtractComponents> blueComponent =
 32         vtkSmartPointer<vtkImageExtractComponents>::New();
 33     blueComponent->SetInputConnection(reader->GetOutputPort());
 34     blueComponent->SetComponents(2);
 35     blueComponent->Update();
 36     //创建演员
 37     vtkSmartPointer<vtkImageActor> origActor =
 38         vtkSmartPointer<vtkImageActor>::New();
 39     origActor->SetInputData(reader->GetOutput());
 40  
 41     vtkSmartPointer<vtkImageActor> redActor =
 42         vtkSmartPointer<vtkImageActor>::New();
 43     redActor->SetInputData(redComponent->GetOutput());
 44  
 45     vtkSmartPointer<vtkImageActor> greenActor =
 46         vtkSmartPointer<vtkImageActor>::New();
 47     greenActor->SetInputData(greenComponent->GetOutput());
 48  
 49     vtkSmartPointer<vtkImageActor> blueActor =
 50         vtkSmartPointer<vtkImageActor>::New();
 51     blueActor->SetInputData(blueComponent->GetOutput());
 52     //定义窗口 并化妆
 53     double origView[4] = { 0.0, 0.0, 0.25, 1.0 };
 54     double redView[4] = { 0.25, 0.0, 0.5, 1.0 };
 55     double greenView[4] = { 0.5, 0.0, 0.75, 1.0 };
 56     double blueView[4] = { 0.75, 0.0, 1.0, 1.0 };
 57  
 58     vtkSmartPointer<vtkRenderer> origRender =
 59         vtkSmartPointer<vtkRenderer>::New();
 60     origRender->SetViewport(origView);
 61     origRender->AddActor(origActor);
 62     origRender->ResetCamera();
 63     origRender->SetBackground(1.0, 1.0, 1.0);
 64  
 65     vtkSmartPointer<vtkRenderer> redRender =
 66         vtkSmartPointer<vtkRenderer>::New();
 67     redRender->SetViewport(redView);
 68     redRender->AddActor(redActor);
 69     redRender->ResetCamera();
 70     redRender->SetBackground(1.0, 1.0, 1.0);
 71  
 72     vtkSmartPointer<vtkRenderer> greenRender =
 73         vtkSmartPointer<vtkRenderer>::New();
 74     greenRender->SetViewport(greenView);
 75     greenRender->AddActor(greenActor);
 76     greenRender->ResetCamera();
 77     greenRender->SetBackground(1.0, 1.0, 1.0);
 78  
 79     vtkSmartPointer<vtkRenderer> blueRender =
 80         vtkSmartPointer<vtkRenderer>::New();
 81     blueRender->SetViewport(blueView);
 82     blueRender->AddActor(blueActor);
 83     blueRender->ResetCamera();
 84     blueRender->SetBackground(1.0, 1.0, 1.0);
 85     //上舞台
 86     vtkSmartPointer<vtkRenderWindow> renderwindow =
 87         vtkSmartPointer<vtkRenderWindow>::New();
 88     renderwindow->AddRenderer(origRender);
 89     renderwindow->AddRenderer(redRender);
 90     renderwindow->AddRenderer(greenRender);
 91     renderwindow->AddRenderer(blueRender);
 92     renderwindow->SetSize(960, 320);
 93     renderwindow->Render();
 94     renderwindow->SetWindowName("ExtraImageColorComponents");
 95     //设置交互
 96     vtkSmartPointer<vtkRenderWindowInteractor> rwi =
 97         vtkSmartPointer<vtkRenderWindowInteractor>::New();
 98     vtkSmartPointer<vtkInteractorStyleImage> style =
 99         vtkSmartPointer<vtkInteractorStyleImage>::New();
100     rwi->SetInteractorStyle(style);
101     rwi->SetRenderWindow(renderwindow);
102     rwi->Initialize();
103  
104     rwi->Start(); 
105     return 0;
106 }