Is there a foolproof or "rigorous" way to accurately and repeatably perform scansion in English poetry? It seems highly subjective at times.
For example, I can pretty easily grasp the iambic tetrameter in Frost's
Whose woods these are I think I know, but can't follow the spondee / iambic / anapest / iambic in his
Two roads diverged in a yellow wood.
My understanding is that you can't just look up the words in a dictionary and determine which syllables are stressed and which ones aren't to perform scansion. The stresses in the line are relative to each other and "stressed" syllables in scansion may appear unstressed in a dictionary pronunciation guide.
Is it really up to the reader to "hear" the poem correctly to perform scansion? Are there any linguistic computer algorithms that "hear" the words in order to perform scansion?