Not necessarily a 1:1 ratio on the weapon dps but it may be a factor in damage calculation.

So far this is how i have heard rune enchantment behave
*A 2h Weapon and a 1H (non-dw) weapon of the same weapon dps will do about the same damage on each hit of a rune
*Dual Wielding a weapon alters the calculation for rune damage, appears to approximately half it per hit if utilizing 2 identical dps weapons
*Using a low dps weapon with a high dps weapon while dual wielding will decrease the damage of runes on BOTH weapons
*Using a very low dps weapon, whether 2handed or 1handed, will result in drastically lower rune damage.

As for an actual calculation on how it works.... no idea here