Originally Posted by
bitingduck
I'd think finish would be easiest, since it's white-black-white (high contrast) and there's only one of them. With pursuit you don't know which one you're at.
My thought was that detecting a color change might be easier than intensity outdoors and counting every other line should not be a problem. Looking a bit more it looks like the iPhone uses variable capture rates so timing gets more interesting and at lower frame rates it might start to miss bits so probably not worth pursuing.