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VTK_Learning_图像信息的访问与修改(vtkImageData)(vtkImageChangeInformation)


1.利用vtkImageData实现图像信息的访问与修改

数字图像文件内容由两个部分组成:图像头信息和数据。图像头信息定义了图像的基本信息,主要包括起点位置(Origin),像素间隔(space)和维数(dimension)。

 

vtkImageData中提供了多个函数用于访问或者获取图像的基本信息,这些函数通常使用Set或者Get加上相应的信息名的形式,例如获取图像维数的方法定义为GetDimensions()。

 2.实验程序及运行结果

#include <vtkAutoInit.h>
VTK_MODULE_INIT(vtkRenderingOpenGL2);

#include <vtkSmartPointer.h>
#include <vtkBMPReader.h>
#include <vtkImageData.h>
#include <vtkImageViewer2.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>

int main()
{
//读数据
vtkSmartPointer<vtkBMPReader> reader =
vtkSmartPointer<vtkBMPReader>::New();
reader->SetFileName("lena.bmp");
reader->Update();

//获取图像信息
int dims[3];
reader->GetOutput()->GetDimensions(dims);
std::cout << "图像维数:" << dims[0] << "*" << dims[1] << "*" << dims[2] << std::endl;

double origin[3];
reader->GetOutput()->GetOrigin(origin);
std::cout << "图像中心:" << origin[0] << " " << origin[1] << " " << origin[2] << std::endl;

double spacing[3];
reader->GetOutput()->GetSpacing(spacing);
std::cout << "图像间距:" << spacing[0] << " " << spacing[1] << " " << spacing[2] << std::endl;

//显示图像
vtkSmartPointer<vtkImageViewer2> imgViewer =
vtkSmartPointer<vtkImageViewer2>::New();
imgViewer->SetInputConnection(reader->GetOutputPort());

vtkSmartPointer<vtkRenderWindowInteractor> rwi =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
imgViewer->SetupInteractor(rwi);
imgViewer->Render();

imgViewer->GetRenderer()->ResetCamera();
imgViewer->Render();

imgViewer->GetRenderer()->SetBackground(1.0, 1.0, 1.0);
imgViewer->SetSize(640,480);

imgViewer->GetRenderWindow()->SetWindowName("GetImageInfo");
rwi->Start();
return 0;
}

 运行结果:

3.类vtkImageChengeInformation用于图像信息修改 

vtkImageData中提供了多个Set函数用于设置图像的基本信息。当对一个管线的输出修改图像信息后,如果管线重新Update,那么这些修改都会恢复回原来的值。而vtkChangeImageInformation可以作为管线中的一个filter来修改图像信息。利用这个filter可以修改图像的原点,像素间隔以及范围起点(extent),另外还可以对图像平移缩放等操作。
 

#include <vtkAutoInit.h>
VTK_MODULE_INIT(vtkRenderingOpenGL);

#include <vtkSmartPointer.h>
#include <vtkBMPReader.h>
#include <vtkImageData.h>
#include <vtkImageChangeInformation.h>
#include <vtkImageViewer2.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>


int main()
{
vtkSmartPointer<vtkBMPReader> reader =
vtkSmartPointer<vtkBMPReader>::New();
reader->SetFileName("lena.bmp");
reader->Update();

int dims[3];
double origin[3];
double spacing[3];

reader->GetOutput()->GetDimensions(dims);
std::cout << "图像维度:" << dims[0] << " " << dims[1] << " " << dims[2] << std::endl;
reader->GetOutput()->GetOrigin(origin);
std::cout << "图像中心:" << origin[0] << " " << origin[1] << " " << origin[2] << std::endl;
reader->GetOutput()->GetSpacing(spacing);
std::cout << "图像间隔:" << spacing[0] << " " << spacing[1] << " " << spacing[2] << std::endl;

vtkSmartPointer<vtkImageChangeInformation> changer =
vtkSmartPointer<vtkImageChangeInformation>::New();
changer->SetInputData(reader->GetOutput());
changer->SetOutputOrigin(100, 100, 0);
changer->SetOutputSpacing(10, 10, 1);
changer->SetCenterImage(1);
changer->Update();

changer->GetOutput()->GetDimensions(dims);
std::cout << "图像维度:" << dims[0] << " " << dims[1] << " " << dims[2] << std::endl;
changer->GetOutput()->GetOrigin(origin);
std::cout << "图像中心:" << origin[0] << " " << origin[1] << " " << origin[2] << std::endl;
changer->GetOutput()->GetSpacing(spacing);
std::cout << "图像间隔:" << spacing[0] << " " << spacing[1] << " " << spacing[2] << std::endl;

vtkSmartPointer<vtkImageViewer2> imgViewer =
vtkSmartPointer<vtkImageViewer2>::New();
imgViewer->SetInputConnection(changer->GetOutputPort());

vtkSmartPointer<vtkRenderWindowInteractor> rwi =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
imgViewer->SetupInteractor(rwi);
imgViewer->Render();

imgViewer->GetRenderer()->ResetCamera();
imgViewer->GetRenderer()->SetBackground(1.0, 1.0, 1.0);
imgViewer->Render();

imgViewer->GetRenderWindow()->SetWindowName("ChangeImageInfo");
imgViewer->SetSize(640, 480);

rwi->Start();

return 0;
}

输出结果:

 

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