Aspect Ratio Waves for Gait Analysis

Geotagging, in which digital photos are labelled with the location where they were taken, becomes more popular today. Users can browse the photos on digital map and make the web photo sharing and management even more conveniently. However, lacking the function of authentication and the way to deal with the situation that information within the EXIF area being falsified, the content of the photo might be inconsistent to the location it has been displayed on map. In this paper, a framework using image steganography and GPS information authentication is proposed for the problem described. By means of embedding GPS information as well as the authentication information into the image, the consistency of photo content and location can be assured. Furthermore, this scheme can be applied to authenticate that a user has ever visited a certain place.