Automatic Calibration of a Urban Video Surveillance System through the Observation of Zebra Crossings


  • Alberto Broggi
  • Alessandra Fascioli
  • Rean Isabella Fedriga
  • Stefano Ghidoni



Automatic calibration, world reconstruction, zebra crossing recognition, distortion evaluation, perspective evaluation, DDC: 004 (Data processing, computer science, computer systems)


In this paper, a method for automatic calibration of a camera stereo pair through the observation of zebra crossing signs is described. It is based on the well-known consideration that it is possible to obtain information about lens distortion and camera orientation by observing how a known pattern appears in the image; moreover, a major advantage of this system is that it does not require any ad-hoc calibration pattern, because it exploits the zebra crossing signs, a pattern usually present in images used for monitoring pedestrians while crossing a road. To achieve this goal, well-known techniques for removing lens distortion and perspective effect are combined with new methods for locating calibration points on the available pattern, and, finally, for evaluating the camera position.






The 5th International Conference on Computer Vision Systems