1. A method for automatically calibrating a multi-projector system with at least two projectors for projecting images onto a projection surface, a digital camera for picking up the projection surface, and a control unit for controlling the projectors and the camera, an auto-calibration being performed according to the following steps: projecting single-strip patterns of intersecting lines parallel in groups onto the projection surface by each of the projectors, the positions of the line intersection points of the single-strip pattern in the image to be projected being known, capturing the projected single-strip patterns by means of the camera, filtering the captured single-strip patterns for compensating for background noise, ambient light and/or optical distortions of the single-strip patterns caused by the camera and for detecting the line intersection points of the captured single-strip patterns, detecting the largest projection surface possible on the basis of the captured single-strip patterns, comparing the positions of the line intersection points within the captured single-strip patterns with the known position of the line intersection points of the single-strip patterns to be projected by the projectors in order to detect correction data for correcting distortions occurring as a consequence of unevennesses of the projection surface, calculating warp fields and image warping corresponding to the correction data.