VTK_Learning_图像基本操作_彩色图像生成灰度图像_彩色图像成分提取

淩亂°似流年 2023-07-07 05:52 4阅读 0赞

# 1.灰度图像映射 #

> vtkImageLuminance负责将一个RGB彩色图像转换为一个单组分的灰度图像。映射公式如下：  
> luminance = 0.3\*R + 0.59\*G + 0.11\*B  
> 该公式中，R为输入图像的第一分量（红色），G为第二分量（绿色），B为第三分量（蓝色）。这个计算结果计算一个RGB颜色的亮度。该类的使用也比较简单，用户无须设置参数，代码如下：  
>  
> 
>     #include <vtkAutoInit.h>
>     VTK_MODULE_INIT(vtkRenderingOpenGL);
>      
>     #include <vtkSmartPointer.h>
>     #include <vtkBMPReader.h>
>     #include <vtkImageLuminance.h>
>     #include <vtkImageActor.h>
>     #include <vtkRenderer.h>
>     #include <vtkRenderWindow.h>
>     #include <vtkRenderWindowInteractor.h>
>     #include <vtkInteractorStyleImage.h>
>      
>     int main()
>     {
>     	vtkSmartPointer<vtkBMPReader> reader =
>     		vtkSmartPointer<vtkBMPReader>::New();
>     	reader->SetFileName("lena.bmp");
>      
>     	vtkSmartPointer<vtkImageLuminance> luminanceFilter =
>     		vtkSmartPointer<vtkImageLuminance>::New();
>     	luminanceFilter->SetInputConnection(reader->GetOutputPort());
>     	luminanceFilter->Update();
>     	//原始演员
>     	vtkSmartPointer<vtkImageActor> origActor =
>     		vtkSmartPointer<vtkImageActor>::New();
>     	origActor->SetInputData(reader->GetOutput());
>     	//灰度演员
>     	vtkSmartPointer<vtkImageActor> shiftscaleActor =
>     		vtkSmartPointer<vtkImageActor>::New();
>     	shiftscaleActor->SetInputData(luminanceFilter->GetOutput());
>     	double origView[4] = { 0.0, 0.0, 0.5, 1.0 };
>     	double shiftscaleView[4] = { 0.5, 0.0, 1.0, 1.0 };
>     	//原始演员化妆
>     	vtkSmartPointer<vtkRenderer> origRender =
>     		vtkSmartPointer<vtkRenderer>::New();
>     	origRender->SetViewport(origView);
>     	origRender->AddActor(origActor);
>     	origRender->ResetCamera();
>     	origRender->SetBackground(1.0, 1.0, 1.0);
>     	//灰度演员化妆
>     	vtkSmartPointer<vtkRenderer> shiftscaleRender =
>     		vtkSmartPointer<vtkRenderer>::New();
>     	shiftscaleRender->SetViewport(shiftscaleView);
>     	shiftscaleRender->AddActor(shiftscaleActor);
>     	shiftscaleRender->ResetCamera();
>     	shiftscaleRender->SetBackground(1.0, 1.0, 1.0);
>      
>     	vtkSmartPointer<vtkRenderWindow> renderwindow =
>     		vtkSmartPointer<vtkRenderWindow>::New();
>     	renderwindow->AddRenderer(origRender);
>     	renderwindow->AddRenderer(shiftscaleRender);
>     	renderwindow->SetSize(720, 480);
>     	renderwindow->Render();
>     	renderwindow->SetWindowName("RGB to Gray");
>      
>     	vtkSmartPointer<vtkRenderWindowInteractor> rwi =
>     		vtkSmartPointer<vtkRenderWindowInteractor>::New();
>     	vtkSmartPointer<vtkInteractorStyleImage> style =
>     		vtkSmartPointer<vtkInteractorStyleImage>::New();
>     	rwi->SetInteractorStyle(style);
>     	rwi->SetRenderWindow(renderwindow);
>     	rwi->Initialize();
>      
>     	rwi->Start();
>     	return 0;
>     }
> 
> ![20170123201713504][]

# 2.彩色图像RGB成分提取 #

> VTK中利用vtkImageExtractComponents可以方便的提取出彩色图像的各个颜色分量，该类的使用比较简单，只需要设置要提取的分量序号即可。下面代码说明了怎样提取彩色图像的某个颜色分量。
> 
>     #include <vtkAutoInit.h>
>     VTK_MODULE_INIT(vtkRenderingOpenGL);
>      
>     #include <vtkSmartPointer.h>
>     #include <vtkBMPReader.h>
>     #include <vtkImageExtractComponents.h>
>     #include <vtkImageActor.h>
>     #include <vtkRenderer.h>
>     #include <vtkRenderWindow.h>
>     #include <vtkRenderWindowInteractor.h>
>     #include <vtkInteractorStyleImage.h>
>      
>     int main()
>     {
>     	vtkSmartPointer<vtkBMPReader> reader =
>     		vtkSmartPointer<vtkBMPReader>::New();
>     	reader->SetFileName("lena.bmp");
>      
>     	vtkSmartPointer<vtkImageExtractComponents> redComponent =
>     		vtkSmartPointer<vtkImageExtractComponents>::New();
>     	redComponent->SetInputConnection(reader->GetOutputPort());
>     	redComponent->SetComponents(0);
>     	redComponent->Update();
>      
>     	vtkSmartPointer<vtkImageExtractComponents> greenComponent =
>     		vtkSmartPointer<vtkImageExtractComponents>::New();
>     	greenComponent->SetInputConnection(reader->GetOutputPort());
>     	greenComponent->SetComponents(1);
>     	greenComponent->Update();
>      
>     	vtkSmartPointer<vtkImageExtractComponents> blueComponent =
>     		vtkSmartPointer<vtkImageExtractComponents>::New();
>     	blueComponent->SetInputConnection(reader->GetOutputPort());
>     	blueComponent->SetComponents(2);
>     	blueComponent->Update();
>     	//创建演员
>     	vtkSmartPointer<vtkImageActor> origActor =
>     		vtkSmartPointer<vtkImageActor>::New();
>     	origActor->SetInputData(reader->GetOutput());
>      
>     	vtkSmartPointer<vtkImageActor> redActor =
>     		vtkSmartPointer<vtkImageActor>::New();
>     	redActor->SetInputData(redComponent->GetOutput());
>      
>     	vtkSmartPointer<vtkImageActor> greenActor =
>     		vtkSmartPointer<vtkImageActor>::New();
>     	greenActor->SetInputData(greenComponent->GetOutput());
>      
>     	vtkSmartPointer<vtkImageActor> blueActor =
>     		vtkSmartPointer<vtkImageActor>::New();
>     	blueActor->SetInputData(blueComponent->GetOutput());
>     	//定义窗口 并化妆
>     	double origView[4] = { 0.0, 0.0, 0.25, 1.0 };
>     	double redView[4] = { 0.25, 0.0, 0.5, 1.0 };
>     	double greenView[4] = { 0.5, 0.0, 0.75, 1.0 };
>     	double blueView[4] = { 0.75, 0.0, 1.0, 1.0 };
>      
>     	vtkSmartPointer<vtkRenderer> origRender =
>     		vtkSmartPointer<vtkRenderer>::New();
>     	origRender->SetViewport(origView);
>     	origRender->AddActor(origActor);
>     	origRender->ResetCamera();
>     	origRender->SetBackground(1.0, 1.0, 1.0);
>      
>     	vtkSmartPointer<vtkRenderer> redRender =
>     		vtkSmartPointer<vtkRenderer>::New();
>     	redRender->SetViewport(redView);
>     	redRender->AddActor(redActor);
>     	redRender->ResetCamera();
>     	redRender->SetBackground(1.0, 1.0, 1.0);
>      
>     	vtkSmartPointer<vtkRenderer> greenRender =
>     		vtkSmartPointer<vtkRenderer>::New();
>     	greenRender->SetViewport(greenView);
>     	greenRender->AddActor(greenActor);
>     	greenRender->ResetCamera();
>     	greenRender->SetBackground(1.0, 1.0, 1.0);
>      
>     	vtkSmartPointer<vtkRenderer> blueRender =
>     		vtkSmartPointer<vtkRenderer>::New();
>     	blueRender->SetViewport(blueView);
>     	blueRender->AddActor(blueActor);
>     	blueRender->ResetCamera();
>     	blueRender->SetBackground(1.0, 1.0, 1.0);
>     	//上舞台
>     	vtkSmartPointer<vtkRenderWindow> renderwindow =
>     		vtkSmartPointer<vtkRenderWindow>::New();
>     	renderwindow->AddRenderer(origRender);
>     	renderwindow->AddRenderer(redRender);
>     	renderwindow->AddRenderer(greenRender);
>     	renderwindow->AddRenderer(blueRender);
>     	renderwindow->SetSize(960, 320);
>     	renderwindow->Render();
>     	renderwindow->SetWindowName("ExtraImageColorComponents");
>     	//设置交互
>     	vtkSmartPointer<vtkRenderWindowInteractor> rwi =
>     		vtkSmartPointer<vtkRenderWindowInteractor>::New();
>     	vtkSmartPointer<vtkInteractorStyleImage> style =
>     		vtkSmartPointer<vtkInteractorStyleImage>::New();
>     	rwi->SetInteractorStyle(style);
>     	rwi->SetRenderWindow(renderwindow);
>     	rwi->Initialize();
>      
>     	rwi->Start(); 
>     	return 0;
>     }
> 
> ![20170123213701880][]

[20170123201713504]: https://img-blog.csdn.net/20170123201713504
[20170123213701880]: https://img-blog.csdn.net/20170123213701880