Self-Calibrating Camera Projector Systems for Interactive Displays and Presentations

The image generated by an off-center projector appears distorted (Figure 1, left). Using an uncalibrated camera pointed at the presentation screen, our system automatically recovers the projector-to-screen homography and pre-warps the computer output to produce a keystone-corrected image (Figure 1, right). This allows the presenter to place the microportable projector anywhere in the room without sacrificing presentation quality. Automatic keystone correction is also attractive in a home theater application where the user could place a microportable projector on a bookshelf at the side of the room and project an undistorted movie on an adjacent wall.