Edge detection as a full screen post process effect while using night vision

[jukibom]

Something like the current colour as edge colour and 50% brightness to everything else, but take a view on it

https://static.wikia.nocookie.net/elite-dangerous/images/7/7f/Night_Vision_SRV_Krait_MkII.png/revision/latest?cb=20181103105723

Need to make sure any effect does not produce subtly different edges per eye for vr!