During writing commercial iPhone app for one of my customers i noticed really strange slowdown in Surf descriptors. Cutting a long story shorter - while matching two frames usign SURF algorithm more than half of overall time (4, FOUR seconds!) was spent in cvRound function! Read more to know what it was and how did i fixed it. Yes, i did it! Now with XCode 4 and iOS 4.3 support. OpenCV Build Scri
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