失眠网 > VTK修炼之道38：图像平滑_中值滤波器

VTK修炼之道38：图像平滑_中值滤波器

时间：2022-01-10 20:53:56

1.中值滤波

vtkImageHybridMedian2D实现了对二维图像的中值滤波。其实现原理是，采用一个5x5的模板，逐次将模板中心对应于图像的每个像素上，将模板图像覆盖的像素的中值作为当前像素的输出值。
#include <vtkAutoInit.h>VTK_MODULE_INIT(vtkRenderingOpenGL);#include <vtkSmartPointer.h>#include <vtkJPEGReader.h>#include <vtkImageData.h>#include <vtkImageCast.h>#include <vtkImageHybridMedian2D.h>#include <vtkImageActor.h>#include <vtkRenderer.h>#include <vtkRenderWindow.h>#include <vtkRenderWindowInteractor.h>#include <vtkInteractorStyleImage.h>int main(int argc, char* argv[]){vtkSmartPointer<vtkJPEGReader> reader =vtkSmartPointer<vtkJPEGReader>::New();reader->SetFileName("lena.jpg");reader->Update();vtkSmartPointer<vtkImageHybridMedian2D> hybridMedian =vtkSmartPointer<vtkImageHybridMedian2D>::New();hybridMedian->SetInputData(reader->GetOutput());hybridMedian->Update();///vtkSmartPointer<vtkImageActor> originalActor =vtkSmartPointer<vtkImageActor>::New();originalActor->SetInputData(reader->GetOutput());vtkSmartPointer<vtkImageActor> hybridMedianActor =vtkSmartPointer<vtkImageActor>::New();hybridMedianActor->SetInputData(hybridMedian->GetOutput());/double originalViewport[4] = { 0.0, 0.0, 0.5, 1.0 };double hybridMedianViewport[4] = { 0.5, 0.0, 1.0, 1.0 };vtkSmartPointer<vtkRenderer> originalRenderer =vtkSmartPointer<vtkRenderer>::New();originalRenderer->SetViewport(originalViewport);originalRenderer->AddActor(originalActor);originalRenderer->ResetCamera();originalRenderer->SetBackground(1.0,0,0);vtkSmartPointer<vtkRenderer> hybridMedianRenderer =vtkSmartPointer<vtkRenderer>::New();hybridMedianRenderer->SetViewport(hybridMedianViewport);hybridMedianRenderer->AddActor(hybridMedianActor);hybridMedianRenderer->ResetCamera();hybridMedianRenderer->SetBackground(1.0, 1.0, 1.0);//vtkSmartPointer<vtkRenderWindow> rw =vtkSmartPointer<vtkRenderWindow>::New();rw->AddRenderer(originalRenderer);rw->AddRenderer(hybridMedianRenderer);rw->SetSize(640, 320);rw->Render();rw->SetWindowName("MedianFilterExample");vtkSmartPointer<vtkRenderWindowInteractor> rwi =vtkSmartPointer<vtkRenderWindowInteractor>::New();vtkSmartPointer<vtkInteractorStyleImage> style =vtkSmartPointer<vtkInteractorStyleImage>::New();rwi->SetInteractorStyle(style);rwi->SetRenderWindow(rw);rwi->Initialize();rwi->Start();return 0;}
该类使用非常简单，不需要用户设置任何参数。该方法能够有效的保持图像边缘，并对于椒盐噪声有较好的抑制作用。对于三维图像，则使用vtkImageHybridMedian3D类。
执行结果如下：