1. A computer-implemented method for defining a display region for a projector display, said method comprising: accessing by a computer system an image of a camera's view of a display region, wherein said image is at least a portion of a projection on said display region from at least one projector; displaying by said computer system said image on a graphical user interface, said image having a first set of coordinates; integrating by said computer system said image with a reference canvas displayed on said graphical user interface, said integrating comprising overlaying a portion of said reference canvas on said image, said reference canvas having a second set of coordinates, wherein one of said first set of coordinates and said second set of coordinates represents a mesh of movable control points, said movable control points being movable from a first location to a second location on said graphical user interface; and mapping by said computer system said first set of coordinates to said second set of coordinates, thereby generating a pointwise correspondence mapping between coordinate points of said image and coordinate points of said reference canvas.