1. An image processing system adapted to recognize an object disposed on a predetermined world surface, the system comprising: means for acquiring an image of the object, the image comprising a distorted projection of the world surface; means for analyzing the acquired image to locate one or more local features of the image, with respect to an image coordinate system of the image; means for mapping the local features into a world coordinate system of the world surface; and means for matching the mapped local features to a model defined in the world coordinate system.