Vtk读取并显示保存图像

（1）：Vtk读取并显示图像：三种方法

转载：未知出处

转载：用VTK显示平面图片：/article/10721867.html

用到vtkJPEGReader类。

包含的头文件：

#include "vtkActor.h" #include "vtkRenderer.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h" #include "vtkImageViewer.h" #include "vtkJPEGReader.h" #include "vtkImageActor.h"
#include "vtkInteractorStyleImage.h" #include "vtkActor2D.h"

方法一：

使用vtkImageMapper和vtkAcotor2D来实现

int main(int argc, char **argv)
{
int extent[6];
vtkJPEGReader *m_reader = vtkJPEGReader::New();
m_reader->SetFileName("C:\\Users\\igst\\Documents\\美图图库\\叶.jpg");
m_reader->SetDataByteOrderToLittleEndian();
m_reader->SetDataScalarTypeToUnsignedChar();
m_reader->SetFileDimensionality(3);
vtkImageMapper *mapper=vtkImageMapper::New();
mapper->SetInput(m_reader->GetOutput());
mapper->SetColorLevel(128); mapper->SetColorWindow(256);
vtkActor2D *actor=vtkActor2D::New();
actor->SetMapper(mapper);
vtkRenderer *m_Renderer = vtkRenderer::New();
vtkRenderWindow *m_RenWin = vtkRenderWindow::New();
m_RenWin->AddRenderer(m_Renderer);
vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
iren->SetRenderWindow(m_RenWin);
vtkInteractorStyleImage *interactor = vtkInteractorStyleImage::New();
iren->SetInteractorStyle(interactor); m_Renderer->AddActor(actor);
m_Renderer->SetBackground(0.1, 0.2, 0.4); m_RenWin->Render();
m_reader->GetDataExtent(extent);//如果把这条命令放在Render()的前面则无效
m_RenWin->SetSize(extent[1],extent[3]);
iren->Initialize();
iren->Start();
return 0;
}

结果：

方法二：

使用vtkImageActor类，不需要用vktImageMaper

int main(int argc, char **argv)
{
vtkJPEGReader *m_reader = vtkJPEGReader::New();
m_reader->SetFileName("C:\\Users\\igst\\Documents\\美图图库\\荷叶.jpg");
m_reader->SetDataByteOrderToLittleEndian();
m_reader->SetDataScalarTypeToUnsignedChar();
m_reader->SetFileDimensionality(3);
vtkImageActor *m_Actor = vtkImageActor::New();
m_Actor->SetInput(m_reader->GetOutput()); vtkRenderer *m_Renderer = vtkRenderer::New();
vtkRenderWindow *m_RenWin = vtkRenderWindow::New();
m_RenWin->AddRenderer(m_Renderer);
vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
iren->SetRenderWindow(m_RenWin);
vtkInteractorStyleImage *interactor = vtkInteractorStyleImage::New();
iren->SetInteractorStyle(interactor); m_Renderer->AddActor(m_Actor);
m_Renderer->SetBackground(0.1, 0.2, 0.4);
m_RenWin->Render();
iren->Initialize();
iren->Start();
return 0;
}

方法三：简便快速
使用ImageViewer,需要调节窗宽窗位

ImageViewer将 vtkRenderWindow, vtkRenderer, vtkActor2D and vtkImageMapper集成在了一起，
不需要再对vtkRenderWindow, vtkRenderer, vtkActor2D and vtkImageMapper定义。
 int main() {
vtkJPEGReader *image=vtkJPEGReader::New();
image->SetFileName("C:\\Users\\igst\\Documents\\美图图库\\竹林.jpg");
image->SetDataByteOrderToLittleEndian();
image->SetDataScalarTypeToUnsignedChar();
vtkImageViewer *pViewer = vtkImageViewer::New();//显示二维图形
pViewer->SetColorLevel(128);//设置窗宽窗位，
pViewer->SetColorWindow(256);
pViewer->SetInput(image->GetOutput());
pViewer->Render();
vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
iren->SetRenderWindow(pViewer->GetRenderWindow());
iren->Initialize();
iren->Start();
return 0;
}

（2）：VTK保存图片