VTK 实例24：BMP图像信息的修改（图像维数、原点坐标和像素间隔）

1 #include "vtkAutoInit.h" 2 VTK_MODULE_INIT(vtkRenderingOpenGL2); 3 VTK_MODULE_INIT(vtkInteractionStyle); 4 5 #include <vtkSmartPointer.h> 6 #include <vtkImageViewer2.h> 7 #include <vtkRenderWindoh> 8 #include <vtkRenderWindowInteractor.h> 9 #include <vtkRenderer.h> 10 #include <vtkBMPReader.h> 11 #include <vtkImageChangeInformation.h> 12 #include <vtkImageData.h> 13 14 //测试图像：../data/lena.bmp 15 int main(int argc, char* argv[]) 16 */ 22 23 vtkSmartPointer<vtkBMPReader> reader = 24 vtkSmartPointer<vtkBMPReader>::New(); 25 //reader>SetFileName(argv[1]); 26 reader>SetFileName("lena.bmp"); 27 reader>Update(); 28 29 int dims[3]; 30 double origin[3]; 31 double spaceing[3]; 32 33 reader>GetOutput()>GetDimensions(dims); 34 std::cout<<"原图像维数:" <<dims[0]<<" "<<dims[1]<<" "<<dims[2]<<std::endl; 35 reader>GetOutput()>GetOrigin(origin); 36 std::cout<<"原图像原点:" <<origin[0]<<" "<<origin[1]<<" "<<origin[2]<<std::endl; 37 reader>GetOutput()>GetSpacing(spaceing); 38 std::cout<<"原像素间隔:" <<spaceing[0]<<" "<<spaceing[1]<<" "<<spaceing[2]<<std::endl<<std::endl;; 39 40 vtkSmartPointer<vtkImageChangeInformation> changer = 41 vtkSmartPointer<vtkImageChangeInformation>::New(); 42 changer>SetInputData(reader>GetOutput());// 43 changer>SetOutputOrigin(100, 100, 0); 44 changer>SetOutputSpacing(5,5,1); 45 changer>SetCenterImage(1); 46 changer>Update(); 47 48 changer>GetOutput()>GetDimensions(dims); 49 std::cout<<"修改后图像维数:" <<dims[0]<<" "<<dims[1]<<" "<<dims[2]<<std::endl; 50 changer>GetOutput()>GetOrigin(origin); 51 std::cout<<"修改后图像原点:" <<origin[0]<<" "<<origin[1]<<" "<<origin[2]<<std::endl; 52 changer>GetOutput()>GetSpacing(spaceing); 53 std::cout<<"修改后像素间隔:" <<spaceing[0]<<" "<<spaceing[1]<<" "<<spaceing[2]<<std::endl; 54 55 vtkSmartPointer<vtkImageViewer2> imageViewer = 56 vtkSmartPointer<vtkImageViewer2>::New(); 57 imageViewer>SetInputConnection(changer>GetOutputPort()); 58 vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = 59 vtkSmartPointer<vtkRenderWindowInteractor>::New(); 60 imageViewer>SetupInteractor(renderWindowInteractor); 61 imageViewer>Render(); 62 imageViewer>GetRenderer()>ResetCamera(); imageViewer>Render(); 64 65 imageViewer>GetRenderer()>SetBackground(1.0, 1.0, 1.0); 66 imageViewer>SetSize(640, 480); 67 imageViewer>GetRenderWindow()>SetWindowName("ImageChangeInformationExample"); 68 69 70 renderWindowInteractor>Start(); 71 72 return EXIT_SUCCESS; 73 }

注：SetCenterImage函数作用是将（0，0，0）点置于图像的中心，所以本程序执行该函数时会从新调用SetOutputOrigin（），所以会覆盖上方设置的原点位置，如果想让本程序输出设定的原点位置为（100，100，0），只需屏蔽语句SetCenterImage（1）

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