METHOD OF IMAGE PROCESSING FOR OFF THE GLASS RAIN SENSING

An assembly (10) for sensing moisture (20) on the exterior surface (22) of a windshield (14) from a position spaced from the interior surface (18) of the windshield (14). The assembly (10) includes a focal plane detector (12) comprising a plurality of pixels (24) adapted for disposition in spaced relationship to the interior surface (18) of the sheet of glass (14). An imaging lens (16) is adapted for disposition between the focal plane detector (12) and the interior surface (18) of the sheet of glass (14) for directing light waves from moisture (20) on the exterior surface (22) of the sheet of glass (14) through the imaging lens (16) to produce successive images of the moisture (20) on the focal plane detector (12).