Would the weapon have to check and see if it hits an image? It does not have eyes and it does not see as far as I can tell.
What about dancing weapons for that matter.
And I guess the same question would apply for any effect that gives the target concealment, if the room is dark, is the weapons vision based on the caster or wielder?
I am sure you could not direct the weapon to switch targets if you can't see the new target, but what if the effect happens after its acquired its target?
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With spiritual weapons, since it strikes from your direction, and must remain in your visual area, I would say that it is using your sight. But this is just my best guess.
For dancing weapons, that is a harder call, If you look at the spell used to create it, animate object, I would treat it as the same. In this case, a dancing sword, basically becomes a basic construct that attacks foes in your area. Since it uses your bab and is considered wielded by you for all maneuvers and effects that target items, I would say that too would use your sight.