openCV Gaussian blur/smoothing of 3D Matrix/Histogram

Question

I have a (3D) Histogram which I like to apply Gaussian smoothing on:

cv::MatND Hist;

In the 1D and 2D cases I blur it via:

cv::GaussianBlur(Hist, Hist, cv::Size(1,3), 1.0);// 1D case
cv::GaussianBlur(Hist, Hist, cv::Size(3,3), 1.0);// 2D case

But I struggle to apply Gaussian blurring in the 3D case.

Has anyone got an idea how to attempt this?

Answer 1

Try use separable kernels like shown here: http://www.programming-techniques.com/2013/03/gaussian-blurring-using-separable.html