What is this? Who is it? Where am I?

We are working on a media search task called instance search, which is to search for a specific object appearing in stored images or videos. It is assumed that the query specifying the object is given only as a set of images, and any metadata such as the associated text is unavailable. We think it an important task because the instance search technology will play a key role to bridge the gap between the real world and the digital world such as WWW. In this talk, I will first review a research history related to the instance search, and then introduce our work. I will also give some perspectives on future directions.