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Photo recognition determines your exact location

12.04.2004

Are you lost in an unknown city abroad and do not know the language? Take a photo of the nearest building with your mobile phone and send it to the web. A photo recognition program on a remote server will pinpoint your exact location and send you instructions on how to proceed.

University of Cambridge (UK) researchers Roberto Chippola and Duncan Robbergson have developed a program that compares photographs of buildings with images from a database of 10D street models. If satellite-based global positioning systems (GPS) determine your location with an accuracy of 50 m at best, and systems using mobile phones with an accuracy of 100 ... 1 m, for this system this figure is XNUMX m.

When an image is acquired, the system begins to detect vertical and horizontal lines. It then rotates it to a precise vertical position and identifies useful details such as window and door angles, colors, and so on. and searches for a match in the database, taking into account the location of the base station from which the signal was received from the mobile phone. Finally, the differences in the images allow the exact location of the photographer to be calculated.

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