Vehicle windscreen rain drop detector has light source coupling light into outer edge of screen with total internal reflection propagation observed by camera using reference comparison image

摘要

The vehicle windscreen rain drop detector (24) has a light source (9) coupling light (14) into the outer edge (17) of the screen (1) to propagate by multiple reflection (15) through the end of the screen with a camera (20) comparing an object free reference image with the current image.