I believe that there isn't an absolute way to value a human life if you don't take into account emotions.
If intelligence is the supreme of the values that one can use to justify actions then AI will make the machine the sovereign of our planet. The real problem is giving a sense to our existence and actions in a way compatible with our emotions and nature and at the same time based on a sound ground. For a machine without emotions our life is no more valuable of that of any other thing be it alive or not.