vtkImageData图像遍历

 

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include 
#include 
VTK_MODULE_INIT(vtkRenderingOpenGL2)
VTK_MODULE_INIT(vtkInteractionStyle)
#include 
#include 
#include 
#include 

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
private slots:
    void openFileSlot();
private:
    vtkSmartPointer   pRenderer0;
    vtkSmartPointer   pRenderer1;
    vtkSmartPointer   pRenderer2;

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    pRenderer0 = vtkSmartPointer::New();
    pRenderer0->SetBackground(1, 0, 0);
    pRenderer0->SetViewport(0, 0, 0.33, 1);

    pRenderer1 = vtkSmartPointer::New();
    pRenderer1->SetBackground(0, 1, 0);
    pRenderer1->SetViewport(0.33, 0, 0.66, 1);

    pRenderer2 = vtkSmartPointer::New();
    pRenderer2->SetBackground(0, 0, 1);
    pRenderer2->SetViewport(0.66, 0, 1, 1);

    ui->qvtkWidget->GetRenderWindow()->AddRenderer(pRenderer0);
    ui->qvtkWidget->GetRenderWindow()->AddRenderer(pRenderer1);
    ui->qvtkWidget->GetRenderWindow()->AddRenderer(pRenderer2);

    connect(ui->pushButton, SIGNAL(clicked(bool)), this, SLOT(openFileSlot()));
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::openFileSlot()
{
#if 1
    QString selectFilePath = QFileDialog::getOpenFileName(this, QString("选择图像文件"), QString(""), QString("图像(*.jpg)"));
#else
    QString selectFilePath = QFileDialog::getOpenFileName(this, QString("选择图像文件"), QString(""), QString("图像(*.png)"));
#endif
    if(selectFilePath.isEmpty())
    {
        ui->textBrowser->append("选择图像路径为空!");
        return ;
    }

    // 原始图像
#if 1
    vtkSmartPointer pJpegReader =  vtkSmartPointer::New();
#else
    vtkSmartPointer pJpegReader =  vtkSmartPointer::New();
#endif
    pJpegReader->SetFileName(selectFilePath.toStdString().c_str());
    pJpegReader->Update();

    ui->textBrowser->append(QString("载入图像:") + selectFilePath + QString(" 成功 !"));

    // vtkImageData
    {
        // 获取图像信息
        int dims[3];
        pJpegReader->GetOutput()->GetDimensions(dims);
        ui->textBrowser->append(QString("图像维数：") + QString::number(dims[0]) + ", " + QString::number(dims[1]) + ", " + QString::number(dims[2]));

        // 获取图像原点
        double origin[3];
        pJpegReader->GetOutput()->GetOrigin(origin);
        ui->textBrowser->append(QString("图像原点：") + QString::number(origin[0]) + ", " + QString::number(origin[1]) + ", " + QString::number(origin[2]));

        // 获取图像的间隔
        double spaceing[3];
        pJpegReader->GetOutput()->GetSpacing(spaceing);
        ui->textBrowser->append(QString("图像像素点间隔：") + QString::number(spaceing[0]) + ", " + QString::number(spaceing[1]) + ", " + QString::number(spaceing[2]));

        vtkSmartPointer pJpegActor = vtkSmartPointer::New();
        pJpegActor->SetInputData(pJpegReader->GetOutput());
        pRenderer0->AddActor(pJpegActor);
    }

    // vtkChangeImageInformation
    {
        // 图像信息进行修改
        vtkSmartPointer pJpegChange = vtkSmartPointer::New();
        pJpegChange->SetInputData(pJpegReader->GetOutput());
        pJpegChange->SetOutputOrigin(100, 100, 0);
        pJpegChange->SetOutputSpacing(5, 5, 1);
        pJpegChange->SetCenterImage(1);
        pJpegChange->Update();


        // 获取图像信息
        int dims[3];
        pJpegChange->GetOutput()->GetDimensions(dims);
        ui->textBrowser->append(QString("修改后图像维数：") + QString::number(dims[0]) + ", " + QString::number(dims[1]) + ", " + QString::number(dims[2]));

        // 获取图像原点
        double origin[3];
        pJpegChange->GetOutput()->GetOrigin(origin);
        ui->textBrowser->append(QString("修改后图像原点：") + QString::number(origin[0]) + ", " + QString::number(origin[1]) + ", " + QString::number(origin[2]));

        // 获取图像的间隔
        double spaceing[3];
        pJpegChange->GetOutput()->GetSpacing(spaceing);
        ui->textBrowser->append(QString("修改后图像像素点间隔：") + QString::number(spaceing[0]) + ", " + QString::number(spaceing[1]) + ", " + QString::number(spaceing[2]));
    }

    // 访问图像点
    {
        int dims[3];
        pJpegReader->GetOutput()->GetDimensions(dims);

        // 深拷贝图像
        vtkSmartPointer pCopyImage = vtkSmartPointer::New();
        pCopyImage->DeepCopy(pJpegReader->GetOutput());

        // 非管线，不需要update
        for(int k = 0; k < dims[2]; ++k)
        {
            for(int i = 0; i < dims[0]; ++i)
            {
                for(int j = 0; j < dims[1]; ++j)
                {
                    if(i < 100 && j < 100)
                    {
                        unsigned char* pPixel = (unsigned char*)(pCopyImage->GetScalarPointer(i, j, k));
                        *(pPixel + 0) = 0;
                        *(pPixel + 1) = 0;
                        *(pPixel + 2) = 0;
                    }
                }
            }
        }

        vtkSmartPointer pCopyActor = vtkSmartPointer::New();
        pCopyActor->SetInputData(pCopyImage);
        pRenderer1->AddActor(pCopyActor);
    }

    // 使用迭代器遍历图像点
    {
        int dims[3];
        pJpegReader->GetOutput()->GetDimensions(dims);

        // 深拷贝图像
        vtkSmartPointer pCopyImage = vtkSmartPointer::New();
        pCopyImage->DeepCopy(pJpegReader->GetOutput());

        // 非管线，不需要update
        int region[] = {dims[0] / 4, dims[0] * 3 / 4, dims[1] / 4, dims[1] * 3 / 4};
        vtkImageIterator pImageIterator(pCopyImage, region);

        while(!pImageIterator.IsAtEnd())
        {
            auto iterBegin = pImageIterator.BeginSpan();
            auto iterEnd   = pImageIterator.EndSpan();
            for(auto iter = iterBegin; iter != iterEnd; ++iter)
            {
                *iter = 255 - *iter;
            }
            pImageIterator.NextSpan();
        }

        vtkSmartPointer pCopyActor = vtkSmartPointer::New();
        pCopyActor->SetInputData(pCopyImage);
        pRenderer2->AddActor(pCopyActor);
    }

    // 不能在MainWidow的构造函数中
    vtkSmartPointer style = vtkSmartPointer::New();
    ui->qvtkWidget->GetRenderWindow()->GetInteractor()->SetInteractorStyle(style);

    pRenderer0->ResetCamera();
    pRenderer1->ResetCamera();
    pRenderer2->ResetCamera();
    ui->qvtkWidget->GetRenderWindow()->Render();
}

 QT UI 文件

 MainWindow
 
  
   
    0
    0
    400
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   MainWindow
  
  
   
    
     
      
       
        
         选择图像
        
       
      
      
       
      
     
    
    
     
    
   
  
  
   
    
     0
     0
     400
     22
    
   
  
  
   
    TopToolBarArea
   
   
    false
   
  
  
 
 
 
  
   QVTKWidget
   QWidget
   
QVTKWidget.h