A method having corresponding apparatus and computer-readable media comprises: receiving a first image, wherein the first image includes a plurality of substantially parallel first stripes, wherein the first image conforms to a virtual display space, wherein the virtual display space comprises a first plurality of first pixel locations; projecting the first image from a projector onto a surface, wherein the projector is described by a projector space comprising a second plurality of second pixel locations; capturing a second image of the first image projected onto the surface, wherein the second image conforms to the virtual display space; detecting edges of the first stripes based on the second image; generating second stripes based upon the edges of the first stripes; and determining a correspondence between each second pixel location and one or more of the first pixel locations based upon the second stripes.