well, face recognition is more specific than you'd need in this case. if you went that route, you could get away with simpler person recognition (height, width

well, face recognition is more specific than you'd need in this case. if you went that route, you could get away with simpler person recognition (height, width, clothing color, accessories, etc.). or you could just track phones and other devices via wifi/bluetooth (and presumably uwb in the near future). but you could also just have salespeople on the floor doing the recognition & ad placement part of it, for a lower-tech solution. i'd actually bet trained salespeople would have better hit rates over algorithmic solutions, where access to large amounts of dislocated data is the main advantage (at the cost of our privacy).