初学ITK，想获取读取图像的尺寸，百度搜了几个，用的代码如下，可是为什么返回值总是 0 呢？还请各位同仁指导，多谢啦。
#include "itkCastImageFilter.h"
#include <itkImage.h>
#include "itkImage.h"
#include "itkCastImageFilter.h"
#include "itkCurvatureFlowImageFilter.h"
#include "itkImageFileReader.h"
#include <itkImageBase.h>
void main()
{
typedef unsigned char PixelType;
const unsigned int Dimension = 3;
typedef itk::Image< PixelType, Dimension > ImageType;
ImageType::Pointer image;
typedef unsigned char InternalPixelType;
typedef itk::Image< InternalPixelType, Dimension > InternalImageType;
typedef itk::ImageFileReader< InternalImageType > ReaderType;
ReaderType::Pointer reader_png_itk = ReaderType::New();
reader_png_itk->SetFileName("C:\\Users\\rolle\\Desktop\\01.png");
image = reader_png_itk->GetOutput();
int x = image->GetLargestPossibleRegion().GetSize()[0];
int y = image->GetLargestPossibleRegion().GetSize()[1];
int z = image->GetLargestPossibleRegion().GetSize()[2];
std::cout <<x<<" "<<y<<" "<<z<< std::endl;
}

你试试reader的正确读入了么。png应该是二维吧。dimension=3可以吗

获取之前
reader_png_itk->update（）

#include "itkImage.h"
#include "itkImageFileReader.h"
int main(int argc, char ** argv)
{
if(argc<2){
std::cout<<"missing param: "<<argv[0]<<" ,3D Image File Name"<<std::endl;//用三维图像作为输入
}
typedef unsigned char PixelType;
const unsigned int Dimension = 3;
typedef itk::Image< PixelType, Dimension > ImageType;
ImageType::Pointer image;
typedef unsigned char InternalPixelType;
typedef itk::Image< InternalPixelType, Dimension > InternalImageType;
typedef itk::ImageFileReader< InternalImageType > ReaderType;
ReaderType::Pointer reader_png_itk = ReaderType::New();
reader_png_itk->SetFileName(argv[1]);
reader_png_itk->Update();//这边加了一句
image = reader_png_itk->GetOutput();
int x = image->GetLargestPossibleRegion().GetSize()[0];
int y = image->GetLargestPossibleRegion().GetSize()[1];
int z = image->GetLargestPossibleRegion().GetSize()[2];
std::cout <<x<<" "<<y<<" "<<z<< std::endl;
return 0;
}