no it's a really good question! I think this just has to do with the line detection algorithm and it tending to find more curves than sharp angle lines -- this is what the matches look like when you draw a Z:
they are not as good as when you draw a curve and I think it's just trimming based on general poor matches. I've found if I round the Z or make the angle less extreme I can get better results.
interesting! thanks. Yes, most of the matches you linked are poor matches
so what you said earlier about starting to trim the start of it must have applied.
I don't have more questions :) Thanks again for sharing this project - the result is fantastic, really shockingly good :) - goes to show...algorithms ftw :)
http://imgur.com/a/YErmM
they are not as good as when you draw a curve and I think it's just trimming based on general poor matches. I've found if I round the Z or make the angle less extreme I can get better results.