VTK 实例36：图像二值化

 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 <vtkJPEGReader.h>
13 #include <vtkImageThreshold.h>
14 #include <vtkImageCast.h>
15 
16 //测试图像：../data/lena-gray.jpg
17 int main(int argc, char* argv[])
18 {
19     vtkSmartPointer<vtkJPEGReader> reader =
20         vtkSmartPointer<vtkJPEGReader>::New();
21     reader->SetFileName("lena-gray.jpg");
22     reader->Update();
23 
24     vtkSmartPointer<vtkImageThreshold> thresholdFilter =
25         vtkSmartPointer<vtkImageThreshold>::New();
26     thresholdFilter->SetInputConnection(reader->GetOutputPort());
27     thresholdFilter->ThresholdByUpper(100);//设置阈值为100
28     thresholdFilter->SetInValue(255);//大于100的设置为255
29     thresholdFilter->SetOutValue(0);//小于100的设置为0
30     thresholdFilter->Update();//算法执行后必须添加更新消息
31 
32     vtkSmartPointer<vtkImageActor> originalActor =
33         vtkSmartPointer<vtkImageActor>::New();
34     originalActor->SetInputData(reader->GetOutput());
35 
36     vtkSmartPointer<vtkImageActor> binaryActor =
37         vtkSmartPointer<vtkImageActor>::New();
38     binaryActor->SetInputData(thresholdFilter->GetOutput());
39 
40     double originalViewport[4] = {0.0, 0.0, 0.5, 1.0};
41     double binaryviewport[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> binaryRenderer =
51         vtkSmartPointer<vtkRenderer>::New();
52     binaryRenderer->SetViewport(binaryviewport);
53     binaryRenderer->AddActor(binaryActor);
54     binaryRenderer->ResetCamera();
55     binaryRenderer->SetBackground(1.0, 1.0, 1.0);
56 
57     vtkSmartPointer<vtkRenderWindow> renderWindow =
58         vtkSmartPointer<vtkRenderWindow>::New();
59     renderWindow->AddRenderer(originalRenderer);
60     renderWindow->AddRenderer(binaryRenderer);
61     renderWindow->SetSize(640, 320);
62     renderWindow->Render();
63     renderWindow->SetWindowName("ImageBinaryExample");
64 
65     vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
66         vtkSmartPointer<vtkRenderWindowInteractor>::New();
67     vtkSmartPointer<vtkInteractorStyleImage> style =
68         vtkSmartPointer<vtkInteractorStyleImage>::New();
69 
70     renderWindowInteractor->SetInteractorStyle(style);
71     renderWindowInteractor->SetRenderWindow(renderWindow);
72     renderWindowInteractor->Initialize();
73     renderWindowInteractor->Start();
74 
75     return EXIT_SUCCESS;
76 }