Mobile augmented reality for books on a shelf

Retrieving information about books on a bookshelf by snapping a photo of book spines with a mobile device is very useful for book-stores, libraries, offices, and homes. In this paper, we develop a new mobile augmented reality system for book spine recognition. Our system achieves very low recognition delays, around 1 second, to support real-time augmentation on a mobile device's viewfinder. We infer user interest by analyzing the motion of objects seen in the viewfinder. Our system initiates a query during each low-motion interval. This selection mechanism eliminates the need to press a button and avoids using degraded motion-blurred query frames during high-motion intervals. The viewfinder is augmented with a book's identity, prices from different vendors, average user rating, location within the enclosing bookshelf, and a digital compass marker. We present a new tiled search strategy for finding the location in the bookshelf with improved accuracy in half the time as in a previous state-of-the-art system. Our AR system has been implemented on an Android smartphone.