void UpdateDisplayExtent();
void ConvertImageToImageDisplayExtent(vtkInformation *sourceImage, const int sourceExtent[6],
vtkImageData *targetImage, int targetExtent[6]);
void UpdateDisplayExtent();
void ConvertImageToImageDisplayExtent(vtkInformation *sourceImage, const int sourceExtent[6],
vtkImageData *targetImage, int targetExtent[6]);