Ad-hoc multi-planar projector displays

Abstract

High-resolution portable projectors have become commodity items now to own - but not to use. It is not always possible to find a display area where the camera can be properly aligned so that an undistorted image be seen. We present a method to project an undistorted image using a digital projector on a piecewise-planar display area. We use uncalibrated structured light ranging to segment the unknown projection area and further compute the homographies that map the projector space to the camera space through each of the planes. The edge detection and point-correspondences are subpixel precise. Finally, we use these computed homographies to pre-warp the display image so that a distortion-free image is visible. Our results show a seamless and correct rectification with accurate segmentation of the planes.