Google Research

Where's Waldo: Matching People in Images of Crowds

  • Rahul Garg
  • Deva Ramanan
  • Steven M. Seitz
  • Noah Snavely
Proc. IEEE Conf. on Computer Vision and Pattern Recognition (2011), pp. 1793-1800


Given a community-contributed set of photos of a crowded public event, this paper addresses the problem of finding all images of each person in the scene. This problem is very challenging due to large changes in camera viewpoints, severe occlusions, low resolution and photos from tens or hundreds of different photographers. Despite these challenges, the problem is made tractable by exploiting a variety of visual and contextual cues – appearance, timestamps, camera pose and co-occurrence of people. This paper demonstrates an approach that integrates these cues to enable high quality person matching in community photo collections downloaded from

Research Areas

Learn more about how we do research

We maintain a portfolio of research projects, providing individuals and teams the freedom to emphasize specific types of work