Downsampling a 3D image by 2 in all dimensions

Support
1

Dear All,

I want to downsample a MHD (3D, RGB) image by 2 in all dimensions. But because the image is a surface the resulting image is sparse. Has VTK some function to do that with some king of filter (Raised Cosine (??)) that do not have that problem?

Thanks,

Luís Gonçalves.

2

Try vtkImageResize. It allows you to choose what filter (interpolator) to use.

  vtkNew<vtkImageSincInterpolator> interpolator;
  // Hann is another name for Raised Cosine
  interpolator->SetWindowFunctionToHann();
  // Perform antialiasing when downsampling
  interpolator->AntialiasingOn();

  vtkNew<vtkImageResize> resize;
  resize->SetInputData(imageData);
  resize->InterpolateOn();
  resize->SetInterpolator(interpolator);
  resize->SetResizeMethodToOutputDimensions();
  resize->SetOutputDimensions(newSize[0], newSize[1], newSize[2]);