[Blindmath] Using crowdsourcing for cropping images?

[Susan Jolly]

You may be interested to know that Bookshare has recently implemented a 
crowdsourcing application called Poet for adding image descriptions to DAISY 
files.
http://diagramcenter.org/development/poet.html

I realize this is not an answer to the question you had asked but it may be 
that their expertise could be helpful in leading to an answer.

Best wishes,
SusanJ