[djb_hackernews]

Optical sorting is pretty common in agriculture. Sounds like these guys do what you are proposing for pecans among their competitors: http://www.buhlergroup.com/global/en/process-technologies/op...

[jhassell]

Optical sorting in Ag with devices less than $1,000 ... not common.

[jacquesm]

That's a good point, industrial machinery is very expensive, smart industrial machinery is extremely expensive.