AUTOMATIC CORRECTION METHOD FOR PANORAMIC MULTI-PROJECTOR DISPLAYS

Abstract

ABSTRACT: In this paper we present an easy and novel method to calibrate a panoramic multi-projector display system. These kinds of displays have a wide range of applications in fields such as simulation, entertainment, marketing and data visualization. Our correction method uses a commercial off-the-shelf camera that rotates around its vertical axis in order to cover the entire screen. Light structured patterns are projected on this screen in order to establish the transformation that relates the camera to each projector. As the camera is only transformed with a pure rotation different views of the camera can be related using panoramic photo stitching algorithms. These photographic techniques allow to establish a common reference frame for all the projectors where the necessary correction can be calculated easily. Once all the transformation relations between the camera, projectors and projection surface are calculated the partial images emitted by each projector can be corrected in order to calibrate the system geometrically. Also, the application of Bezier patches to model the projectors allows the use of an uncalibrated camera. Our main contribution is the application of panoramic photo stitching algorithms to multi-projector display correction in order to make the correction procedure easier compared to previous methods. The validation of the described methodology is done presenting the case of a panoramic display composed of five projectors.