VTK 实例26：将BMP类型的RGB图像转换为灰度图像

 1 #include "vtkAutoInit.h" 
 2 VTK_MODULE_INIT(vtkRenderingOpenGL2);
 3 VTK_MODULE_INIT(vtkInteractionStyle);
 4 
 5 #include <vtkSmartPointer.h>
 6 #include <vtkImageData.h>
 7 #include <vtkRenderWindow.h>
 8 #include <vtkRenderWindowInteractor.h>
 9 #include <vtkInteractorStyleImage.h>
10 #include <vtkRenderer.h>
11 #include <vtkImageActor.h>
12 #include <vtkBMPReader.h>
13 #include <vtkImageLuminance.h>
14 
15 //测试图像：../data/lena.bmp
16 int main(int argc, char* argv[])
17 {
18     vtkSmartPointer<vtkBMPReader> reader =
19     vtkSmartPointer<vtkBMPReader>::New();
20     reader->SetFileName ( "lena.bmp" );
21 
22     vtkSmartPointer<vtkImageLuminance> luminanceFilter = 
23         vtkSmartPointer<vtkImageLuminance>::New();
24     luminanceFilter->SetInputConnection(reader->GetOutputPort());
25     luminanceFilter->Update();
26 
27     vtkSmartPointer<vtkImageActor> originalActor =
28         vtkSmartPointer<vtkImageActor>::New();
29     originalActor->SetInputData(reader->GetOutput());
30 
31     vtkSmartPointer<vtkImageActor> shiftscaleActor =
32         vtkSmartPointer<vtkImageActor>::New();
33     shiftscaleActor->SetInputData(luminanceFilter->GetOutput());
34 
35     double originalViewport[4] = {0.0, 0.0, 0.5, 1.0};
36     double shiftscaleViewport[4] = {0.5, 0.0, 1.0, 1.0};
37 
38     vtkSmartPointer<vtkRenderer> originalRenderer =
39         vtkSmartPointer<vtkRenderer>::New();
40     originalRenderer->SetViewport(originalViewport);
41     originalRenderer->AddActor(originalActor);
42     originalRenderer->ResetCamera();
43     originalRenderer->SetBackground(1.0, 1.0, 1.0);
44 
45     vtkSmartPointer<vtkRenderer> shiftscaleRenderer =
46         vtkSmartPointer<vtkRenderer>::New();
47     shiftscaleRenderer->SetViewport(shiftscaleViewport);
48     shiftscaleRenderer->AddActor(shiftscaleActor);
49     shiftscaleRenderer->ResetCamera();
50     shiftscaleRenderer->SetBackground(1.0, 1.0, 1.0);
51 
52     vtkSmartPointer<vtkRenderWindow> renderWindow =
53         vtkSmartPointer<vtkRenderWindow>::New();
54     renderWindow->AddRenderer(originalRenderer);
55     renderWindow->AddRenderer(shiftscaleRenderer);
56     renderWindow->SetSize( 640, 320 );
57     renderWindow->Render();
58     renderWindow->SetWindowName("Color2GrayImageExample");
59 
60     vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
61         vtkSmartPointer<vtkRenderWindowInteractor>::New();
62     vtkSmartPointer<vtkInteractorStyleImage> style =
63         vtkSmartPointer<vtkInteractorStyleImage>::New();
64 
65     renderWindowInteractor->SetInteractorStyle(style);
66     renderWindowInteractor->SetRenderWindow(renderWindow);
67     renderWindowInteractor->Initialize();
68 
69     renderWindowInteractor->Start();
70 
71     return EXIT_SUCCESS;
72 }