Demo Abstract:iBookshelf:Accurately Search and Locate Books with an Adaptive and Intelligent Bookshelf Xi ChenT,Lei XieT,Xiaofan Jiang,Sanglu Lu',and Daoxu Chen State Key Laboratory for Novel Software Technology,Nanjing University,Nanjing,China ￥Intel Labs China hawkxc@dislab.nju.edu.cn,Ixie@nju.edu.cn,fred.jiang@intel.com,{sanglu,cdx@nju.edu.cn Abstract It is a tedious task to search and locate a specific book from massive number of books arbitrarily placed in a book- shelf.In this paper,we demonstrate iBookshelf,a system which allows users to quickly search and accurately locate books in the bookshelf,by leveraging a passive RFID sys- tem.By deploying a number of reference tags on the book- shelf,we are able to perform localization based on the simi- larities in received signal strength,and effectively offset the impact from the ambient noises and interferences.We de- ploy and evaluate our system in a real 3mx2.5m bookshelf. Figure 1.Real image of iBookshelf and show that users are able to locate the book from our Android-based application with 85%accuracy. Keywords resilient to environmental changes by adaptively conduct- Localization.Search.Bookshelf.Passive RFID ing self-calibration,and locates the book with 85%accu- 1 racy in a real-time approach.In this system,each book is Introduction attached with a passive RFID tag,which costs a few cents In our daily lives,most people will find that it is a te- per tag.The passive RFID reader obtains the information by dious task to search and locate a specified book from a large resolving the backscattered signals from passive tags,there- volume of books,which are often arbitrarily placed in the fore,the received signal strength is very sensitive to the dis- bookshelf.The traditional indoor localization techniques are tance,which improves localization accuracy.According to mainly based on WiFi[5],sound[3]as well as active RFID keywords stored in the tags,the system indexes the corre- [2],among which the highest accuracy is 1m~2m.Howev- sponding information of the books and supports information er,these techniques are not suitable for locating a book in the retrieval similar to using the Google search bar.By means bookshelf due to the relative low accuracy in localization of the reference tags on the bookshelf,the system is able to Meanwhile,current research on "smart"bookshelves[1][4] accurately locate the book based on the similarities in the re- either seek to locate books through optical localization using ceived signal strength,and effectively offset the impact from integrated LEDs or require calibration through a laborious the ambient noises and interferences.In our demonstration, training phase. the books are placed into a bookshelf with 4x4 grids,as In this paper,we demonstrate iBookshelf,a cost-effective shown in Fig.1.Users can use the custom-designed Android- system which allows users to search and accurately locate based tablet embedded in the bookshelf to search and locate the books in the bookshelf,by leveraging the passive RFID the specified books. system.Different from the previous work,by deploying a number of reference tags on the bookshelf,our system is 2 System Design Our system is composed of three main parts:(1)data ac- Video demo is available at http://cs.nju.edu.cn/lxie/ibookshelf.htm quisition module,(2)indexing/search module,and (3)local- ization module.Fig.2 shows the design model of iBookshelf. The bookshelf is composed of 16 grids with 4 columns and 4 rows,the size of each grid is 60cm x 75cm.As Fig.2 il- lustrates,the data acquisition module includes the reader as well as the antennas.In current implementation,we use the Alien-9900 reader and Alien-9611 linear antenna with a di- rectional gain of 6dB.We deploy the reader on the bottom of Copyright is held by the author/owner(s).SenSys'12,November 6-9,2012,Toronto, Canada.AM978-1-4503-1169-411/12 the bookshelf,while placing 2 antennas on both sides of the bookshelf.The indexing/search module and the localization ACM module are implemented in the tablet PC,which communi-Demo Abstract: iBookshelf: Accurately Search and Locate Books with an Adaptive and Intelligent Bookshelf Xi Chen† , Lei Xie† , Xiaofan Jiang‡ , Sanglu Lu† , and Daoxu Chen† †State Key Laboratory for Novel Software Technology, Nanjing University, Nanjing, China ‡ Intel Labs China hawkxc@dislab.nju.edu.cn, lxie@nju.edu.cn, fred.jiang@intel.com, {sanglu,cdx}@nju.edu.cn Abstract It is a tedious task to search and locate a specific book from massive number of books arbitrarily placed in a book￾shelf. In this paper, we demonstrate iBookshelf1 , a system which allows users to quickly search and accurately locate books in the bookshelf, by leveraging a passive RFID sys￾tem. By deploying a number of reference tags on the book￾shelf, we are able to perform localization based on the simi￾larities in received signal strength, and effectively offset the impact from the ambient noises and interferences. We de￾ploy and evaluate our system in a real 3m×2.5m bookshelf, and show that users are able to locate the book from our Android-based application with 85% accuracy. Keywords Localization, Search, Bookshelf, Passive RFID 1 Introduction In our daily lives, most people will find that it is a te￾dious task to search and locate a specified book from a large volume of books, which are often arbitrarily placed in the bookshelf. The traditional indoor localization techniques are mainly based on WiFi[5], sound[3] as well as active RFID [2], among which the highest accuracy is 1m∼2m. Howev￾er, these techniques are not suitable for locating a book in the bookshelf due to the relative low accuracy in localization. Meanwhile, current research on “smart” bookshelves[1][4] either seek to locate books through optical localization using integrated LEDs or require calibration through a laborious training phase. In this paper, we demonstrate iBookshelf, a cost-effective system which allows users to search and accurately locate the books in the bookshelf, by leveraging the passive RFID system. Different from the previous work, by deploying a number of reference tags on the bookshelf, our system is 1Video demo is available at http://cs.nju.edu.cn/lxie/ibookshelf.htm Copyright is held by the author/owner(s). SenSys ’12, November 6-9, 2012, Toronto, Canada. ACM 978-1-4503-1169-4/11/12 ACM Figure 1. Real image of iBookshelf resilient to environmental changes by adaptively conduct￾ing self-calibration, and locates the book with 85% accu￾racy in a real-time approach. In this system, each book is attached with a passive RFID tag, which costs a few cents per tag. The passive RFID reader obtains the information by resolving the backscattered signals from passive tags, there￾fore, the received signal strength is very sensitive to the dis￾tance, which improves localization accuracy. According to keywords stored in the tags, the system indexes the corre￾sponding information of the books and supports information retrieval similar to using the Google search bar. By means of the reference tags on the bookshelf, the system is able to accurately locate the book based on the similarities in the re￾ceived signal strength, and effectively offset the impact from the ambient noises and interferences. In our demonstration, the books are placed into a bookshelf with 4×4 grids, as shown in Fig.1. Users can use the custom-designed Android￾based tablet embedded in the bookshelf to search and locate the specified books. 2 System Design Our system is composed of three main parts: (1) data ac￾quisition module, (2) indexing/search module, and (3) local￾ization module. Fig.2 shows the design model of iBookshelf. The bookshelf is composed of 16 grids with 4 columns and 4 rows, the size of each grid is 60cm × 75cm. As Fig.2 il￾lustrates, the data acquisition module includes the reader as well as the antennas. In current implementation, we use the Alien-9900 reader and Alien-9611 linear antenna with a di￾rectional gain of 6dB. We deploy the reader on the bottom of the bookshelf, while placing 2 antennas on both sides of the bookshelf. The indexing/search module and the localization module are implemented in the tablet PC, which communi-