In a method of detecting optical axis of a headlamp, according to the present invention, an image of the light projected onto the screen is segmented grid by grid on the reference grid plane, a test window set in the reference grid plane is moved and the illuminance of the light incident upon a CCD corresponding...http://www.google.de/patents/US5379104?utm_source=gb-gplus-sharePatent US5379104 - Method of, and apparatus for, detecting optical axis of headlamp
