Image Classification in the past
Back in 2008, I was writing about how a search engine might learn from photo databases like Flickr, and how people label images there in a post I wrote called, Community Tagging and Ranking in Images of Landmarks
In another post that covers the Flickr image classification Landmark work, Faces and Landmarks: Two Steps Towards Smarter Image Searches, I mentioned part of what the Yahoo study uncovered:
Using automatically generated location data, and software that can cluster together similar images to learn about images again goes beyond just looking at the words associated with pictures to learn what they are about.
That is using metadata from images in an image collection, which is very different from what Google is doing in this post about identifying landmarks in the post, How Google May Interpret Queries Based on Locations and Entities (Tested), where it might identify landmarks based upon a knowledge of their actual location.