system for the camera-phone. Consider a customer seeing a
book in a bookstore and wanting to learn more about the
book. Using our system, the customer takes a snapshot of
the book with the camera-phone. The camera-phone pro-
cesses the query image and sends query data over the wire-
less network to a remote server. The server processes the
query data and recognizes the item among a large database
of products. Then, reviews of the book, pricing from other
merchants, and electronic version availability of the book
can be returned to the customer. For a customer in a music
shop, a picture of a CD cover can be used as a query to nd
music samples for the particular product. If the query item
is a DVD, a short description of the movie and its online
availability is provided.
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The camera-phone is a convenient visual input device,
having the ability to take photos and process data. These
abilities enable many interesting image retrieval applica-
tions. For small image databases, we can store the database
on the phone and run local image retrieval applications. For
large image databases, the database is placed on a server
with enough storage space. Query data is sent from the
camera-phone to the server where image retrieval is per-

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