1. A projection apparatus for forming an image frame on a display surface, wherein the image frame comprises a two-dimensional array of pixels, the apparatus comprising: (a) a projector for directing an image-bearing beam toward the display surface, comprising: (i) a laser light source; (ii) an image modulator for modulating said laser light source to form said image-bearing beam, according to image data; (iii) projection optics for projecting said image-bearing beam toward the display surface to form the image frame; (b) a camera for obtaining a sensed pixel array by sensing the two-dimensional array of pixels of the image frame formed on the display surface by said image-bearing beam; (c) a control logic processor for comparing said sensed pixel array with corresponding said image data for the image frame to identify any portion of said image-bearing beam that is obstructed from the display surface and for disabling pixels within said obstructed portion of said image-bearing beam for at least one subsequent image frame.