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Mobile Access to Personal Digital Photograph ArchivesCathal Gurrin1, Gareth J.F. Jones1, Hyowon Lee1, Neil O’Hare1, Alan F. Smeaton2, Noel Murphy11Centre for Digital Video Processing, 2Adaptive Information ClusterDublin City UniversityDublin, Irelandcgurrin@computing.dcu.ieABSTRACTHandheld computing devices are becoming highly connecteddevices with high capacity storage. This has resulted in their beingable to support storage of, and access to, personal photo archives.However the only means for mobile device users to browse sucharchives is typically a simple one-by-one scroll through imagethumbnails in the order that they were taken, or by manuallyorganising them based on folders. In this paper we describe asystem for context-based browsing of personal digital photoarchives. Photos are labeled with the GPS location and time theyare taken and this is used to derive other context-based metadatasuch as weather conditions and daylight conditions. We presentour prototype system for mobile digital photo retrieval, and anexperimental evaluation illustrating the utility of locationinformation for effective personal photo retrieval.Categories and Subject DescriptorsH.5.1 [Information Interfaces and Presentation]: MultimediaInformation Systems – evaluation/methodology.General TermsHuman Factors.KeywordsPersonal Digital Photo Archive, GPS Location, Mobile Access.1. INTRODUCTIONRecent years have seen a revolution in photography with a moveaway from analog film towards digital technologies, resulting inmany users accumulating very large numbers of personal digitalphotographs. The standard scenario is that these are uploadedfrom a camera to be stored, accessed and printed using personalcomputers. However, the increasing storage capacity of handhelddevices, such as the iPod Photo, and the cameras themselvesmeans that mobile users are increasingly now actually carryingsignificant photo archives with them in their pockets. In addition,many web services exist that offer photos storage and basicorganisation services for a user’s digital photos.Developments in wireless networking support users downloadingphotos from their personal archives (and elsewhere) to handhelddevices whilst the user is mobile. This provides a greatopportunity for users to share photos with others while on themove, but a significant issue is how does a mobile device supportsearching through a personal archive which may comprisehundreds or thousands of photos?In this paper we describe how we use contextual data, e.g. timeand location of image capture, to manage a personal digital photoarchive. We illustrate how this is particularly valuable for searchon mobile devices where data entry is restricted. The time anddate of capture are easily accessible from the camera, and this canbe augmented with location information using coincident GPSlocation data. Using context in this way has the advantage thatphoto indexing is entirely automatic, thereby removing the needfor the user to manually annotate and index the photos.The mobile system described in this paper gives a user ubiquitousaccess to the contents of their photo archive. We also showexperimentally that using context annotation in this way canvastly improve retrieval speed, reducing the amount of userinteraction required to locate relevant photos by nearly 50%.
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