[thesystemis]

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:

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.

[logicallee]

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 :)

[dorianm]

Your link to the image doesn't work.

Great work BTW

[thesystemis]

fixed! thanks!