VTK系列47_圖像進行理想高通濾波器處理（頻域處理）

執行個體47：理想高通濾波器（頻域處理）

#include "vtkAutoInit.h" 
VTK_MODULE_INIT(vtkRenderingOpenGL2);
VTK_MODULE_INIT(vtkInteractionStyle);

#include <vtkSmartPointer.h>
#include <vtkImageData.h>
#include <vtkImageIdealHighPass.h>
#include <vtkImageActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkJPEGReader.h>
#include <vtkImageFFT.h>
#include <vtkImageRFFT.h>
#include <vtkImageExtractComponents.h>
#include <vtkImageCast.h>

//測試圖像：../data/lena-gray.jpg
int main(int argc, char* argv[])
{
	vtkSmartPointer<vtkJPEGReader> reader = 
		vtkSmartPointer<vtkJPEGReader>::New();
	reader->SetFileName("lena-gray.jpg");
	reader->Update();

	vtkSmartPointer<vtkImageFFT> fftFilter =
		vtkSmartPointer<vtkImageFFT>::New();
	fftFilter->SetInputConnection(reader->GetOutputPort());
	fftFilter->Update();

	vtkSmartPointer<vtkImageIdealHighPass> highPassFilter = 
		vtkSmartPointer<vtkImageIdealHighPass>::New();
	highPassFilter->SetInputConnection(fftFilter->GetOutputPort());
	highPassFilter->SetXCutOff(0.1);
	highPassFilter->SetYCutOff(0.1);
	highPassFilter->Update();

	vtkSmartPointer<vtkImageRFFT> rfftFilter =
		vtkSmartPointer<vtkImageRFFT>::New();
	rfftFilter->SetInputConnection(highPassFilter->GetOutputPort());
	rfftFilter->Update();

	vtkSmartPointer<vtkImageExtractComponents> ifftExtractReal =
		vtkSmartPointer<vtkImageExtractComponents>::New();
	ifftExtractReal->SetInputConnection(rfftFilter->GetOutputPort());
	ifftExtractReal->SetComponents(0);

	vtkSmartPointer<vtkImageCast> castFilter =
		vtkSmartPointer<vtkImageCast>::New();
	castFilter->SetInputConnection(ifftExtractReal->GetOutputPort());
	castFilter->SetOutputScalarTypeToUnsignedChar();
	castFilter->Update();

	vtkSmartPointer<vtkImageActor> originalActor =
		vtkSmartPointer<vtkImageActor>::New();
	originalActor->SetInputData(reader->GetOutput());

	vtkSmartPointer<vtkImageActor> erodedActor =
		vtkSmartPointer<vtkImageActor>::New();
	erodedActor->SetInputData(castFilter->GetOutput());

	double leftViewport[4] = {0.0, 0.0, 0.5, 1.0};
	double rightViewport[4] = {0.5, 0.0, 1.0, 1.0};

	vtkSmartPointer<vtkRenderWindow> renderWindow =
		vtkSmartPointer<vtkRenderWindow>::New();
	renderWindow->SetSize(640, 320);
	renderWindow->Render();
	renderWindow->SetWindowName("IdealHighPassExample");

	vtkSmartPointer<vtkRenderWindowInteractor> interactor =
		vtkSmartPointer<vtkRenderWindowInteractor>::New();
	interactor->SetRenderWindow(renderWindow);

	vtkSmartPointer<vtkRenderer> leftRenderer =
		vtkSmartPointer<vtkRenderer>::New();
	renderWindow->AddRenderer(leftRenderer);
	leftRenderer->SetViewport(leftViewport);
	leftRenderer->SetBackground(1.0, 1.0, 1.0);

	vtkSmartPointer<vtkRenderer> rightRenderer =
		vtkSmartPointer<vtkRenderer>::New();
	renderWindow->AddRenderer(rightRenderer);
	rightRenderer->SetViewport(rightViewport);
	rightRenderer->SetBackground(1.0, 1.0, 1.0);

	leftRenderer->AddActor(originalActor);
	rightRenderer->AddActor(erodedActor);

	leftRenderer->ResetCamera();
	rightRenderer->ResetCamera();

	renderWindow->Render();
	interactor->Start();

	return EXIT_SUCCESS;
}
           

VTK系列目錄：

1 VTK基本概念

2 VTK圖像處理

3 VTK圖形處理

4 VTK體繪制