So no doubt if you even vaguely follow computer vision type stuff you’ve heard of the OpenCV library, and as we’ve mentioned occasionally people have been using it on iOS with some degree of effort for a while now; but as of the latest release (2.4.2) it’s officially supported:
…. opencv2.framework for iOS has been created. You can either download the binary from SourceForge or build it yourself using the simple guide. Also, you may be interested to look at some OpenCV on iOS samples, created by our GSoC 2012 students Eduard and Charu and read the slides of the tutorial…
Speaking of tutorials, here’s a series just updated (h/t @romainbriche) for iOS to get you started nice and easy processing both video frames and saved photos:
Code for these is on github at BloodAxe / OpenCV-Tutorial if you’re in a hurry.