According to Google, almost one trillion images now exist online, thanks to the explosion in popularity of digital cameras and camera phones. and the company is looking at ways to improve how users can search for the pictures they want.

Currently, Google’s image search relies on textual information stored in and around images on web pages. This is fine to a point, but not only does it have the potential to be abused by people trying to make their web pages more popular, but it relies on a human to correctly categorise a picture and what it contains…