Image conversion for signage

A method of image conversion for signage, displaying an image on a display surface, comprises determining (1) a shape model of a three-dimensional object, determining (2) geometric properties of a display surface including a position and orientation of the display surface in a space, determining (3) a position of a viewpoint in the space, determining (4) a position and orientation of the shape model in the space, and computing (6) an inverse perspective projection onto the display surface based on the position of the viewpoint, for example the camera position in space, to generate a display image, wherein the display image, when displayed on the display surface and viewed through the viewpoint, appears to show the three-dimensional object with a position and orientation according to the position and orientation of the shape model in the space.