Gaussian blurring (or Gaussian smoothing) is the application of a mathematical function to an image in order to blur it.
related work by A. Knieps:
https://alexrobomind.github.io/fusionsc/howto/Heat%20Load%20Calculation.html
Raw source for the flux computation / gaussian blurring module:
https://jugit.fz-juelich.de/a.knieps/fsc/-/blob/main/src/c++/fsc/hfcam.cpp
The important parts are the lines 360 to 430