图像灰度处理与边缘检测

图片是从网上下载，先将其处理为灰度图像，之后进行边缘检测。

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#ifndef INITIAL_OPENGL #define INITIAL_OPENGL   #include"vtkAutoInit.h" VTK_MODULE_INIT(vtkRenderingOpenGL2) VTK_MODULE_INIT(vtkInteractionStyle)   #endif   //转为灰度和滤波 int main() {     vtkSmartPointer<vtkJPEGReader> reader1 =         vtkSmartPointer<vtkJPEGReader>::New();     reader1->SetFileName("D:\\QTData\\Vtk-new\\figure2.jpg");     reader1->Update();       //图像灰度化     vtkSmartPointer<vtkImageLuminance> luminanceFilter =         vtkSmartPointer<vtkImageLuminance>::New();     luminanceFilter->SetInputConnection(reader1->GetOutputPort());     luminanceFilter->Update();       //计算图像梯度     vtkSmartPointer<vtkImageGradient> imgGradient =         vtkSmartPointer<vtkImageGradient>::New();     imgGradient->SetInputConnection(luminanceFilter->GetOutputPort());     imgGradient->SetDimensionality(2);//图像维数       //计算梯度向量的2范数，即向量的模     vtkSmartPointer<vtkImageMagnitude> imgMagnitude =         vtkSmartPointer<vtkImageMagnitude>::New();     imgMagnitude->SetInputConnection(imgGradient->GetOutputPort());     imgMagnitude->Update();       double Range[2];     vtkSmartPointer<vtkImageData> getRange =         vtkSmartPointer<vtkImageData>::New();     imgMagnitude->GetOutput()->GetScalarRange(Range);//图像灰度范围最小值、最大值       //调整图像的数据范围     vtkSmartPointer<vtkImageShiftScale> imgShiftScale =         vtkSmartPointer<vtkImageShiftScale>::New();     imgShiftScale->SetOutputScalarTypeToUnsignedChar(); //强制类型转换 0~255     imgShiftScale->SetScale(255 / Range[1]); //灰度映射间距     imgShiftScale->SetInputConnection(imgMagnitude->GetOutputPort());     imgShiftScale->Update();                 vtkSmartPointer<vtkImageActor> origActor =         vtkSmartPointer<vtkImageActor>::New();     origActor->SetInputData(reader1->GetOutput());       vtkSmartPointer<vtkImageActor> GradientActor =         vtkSmartPointer<vtkImageActor>::New();     GradientActor->SetInputData(imgShiftScale->GetOutput());       double origView[4] = { 0, 0, 0.5, 1 };     double gradientView[4] = { 0.5, 0, 1, 1 };     vtkSmartPointer<vtkRenderer> origRender =         vtkSmartPointer<vtkRenderer>::New();     origRender->SetViewport(origView);     origRender->AddActor(origActor);     origRender->ResetCamera();     origRender->SetBackground(1.0, 0, 0);       vtkSmartPointer<vtkRenderer> gradientRender =         vtkSmartPointer<vtkRenderer>::New();     gradientRender->SetViewport(gradientView);     gradientRender->AddActor(GradientActor);     gradientRender->ResetCamera();     gradientRender->SetBackground(1, 1, 1);       vtkSmartPointer<vtkRenderWindow> rw =         vtkSmartPointer<vtkRenderWindow>::New();     rw->AddRenderer(origRender);     rw->AddRenderer(gradientRender);     rw->SetSize(640, 320);     rw->SetWindowName("Image Gradient");       vtkSmartPointer<vtkRenderWindowInteractor> rwi =         vtkSmartPointer<vtkRenderWindowInteractor>::New();     vtkSmartPointer<vtkInteractorStyleImage> style =         vtkSmartPointer<vtkInteractorStyleImage>::New();     rwi->SetRenderWindow(rw);     rwi->SetInteractorStyle(style);     rwi->Initialize();     rwi->Start();       return 0; }

  实现结果如下图所示：

 

 参考：https://www.cnblogs.com/ybqjymy/p/14241281.html

　　　 https://blog.csdn.net/shenziheng1/article/details/54747184