VTK 实例30：提取BMP图像的感兴趣区域(区域提取)

 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 <vtkExtractVOI.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     reader->Update();
22 
23     int dims[3];
24     reader->GetOutput()->GetDimensions(dims);
25 
26     vtkSmartPointer<vtkExtractVOI> extractVOI =
27         vtkSmartPointer<vtkExtractVOI>::New();
28     extractVOI->SetInputConnection(reader->GetOutputPort());
29     extractVOI->SetVOI(dims[0]/4.,3.*dims[0]/4.,dims[1]/4.,3.*dims[1]/4., 0, 0);
30     extractVOI->Update();
31 
32     vtkSmartPointer<vtkImageActor> originalActor =
33         vtkSmartPointer<vtkImageActor>::New();
34     originalActor->SetInputData(reader->GetOutput());
35 
36     vtkSmartPointer<vtkImageActor> voiActor =
37         vtkSmartPointer<vtkImageActor>::New();
38     voiActor->SetInputData(extractVOI->GetOutput());
39 
40     double originalViewport[4] = {0.0, 0.0, 0.5, 1.0};
41     double voiviewport[4] = {0.5, 0.0, 1.0, 1.0};
42 
43     vtkSmartPointer<vtkRenderer> originalRenderer =
44         vtkSmartPointer<vtkRenderer>::New();
45     originalRenderer->SetViewport(originalViewport);
46     originalRenderer->AddActor(originalActor);
47     originalRenderer->ResetCamera();
48     originalRenderer->SetBackground(1.0, 1.0, 1.0);
49 
50     vtkSmartPointer<vtkRenderer> shiftscaleRenderer =
51         vtkSmartPointer<vtkRenderer>::New();
52     shiftscaleRenderer->SetViewport(voiviewport);
53     shiftscaleRenderer->AddActor(voiActor);
54     shiftscaleRenderer->ResetCamera();
55     shiftscaleRenderer->SetBackground(1.0, 1.0, 1.0);
56 
57     vtkSmartPointer<vtkRenderWindow> renderWindow =
58         vtkSmartPointer<vtkRenderWindow>::New();
59     renderWindow->AddRenderer(originalRenderer);
60     renderWindow->AddRenderer(shiftscaleRenderer);
61     renderWindow->SetSize(900, 300);
62     renderWindow->Render();
63     renderWindow->SetWindowName("ExtractVOIExample");
64 
65 
66     vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
67         vtkSmartPointer<vtkRenderWindowInteractor>::New();
68     vtkSmartPointer<vtkInteractorStyleImage> style =
69         vtkSmartPointer<vtkInteractorStyleImage>::New();
70 
71     renderWindowInteractor->SetInteractorStyle(style);
72     renderWindowInteractor->SetRenderWindow(renderWindow);
73     renderWindowInteractor->Initialize();
74     renderWindowInteractor->Start();
75 
76     return EXIT_SUCCESS;
77 }