DETERMINATION OF ILLUMINATOR OBSTRUCTION BY KNOWN OPTICAL PROPERTIES

A vehicle includes an image sensor having a field of view, an illuminator aimed at the field of view; and a computer including a processor and a memory storing instructions executable by the processor. The computer is programmed to illuminate an object external to the vehicle; determine that the object has a known optical property; determine the optical property of the object from a database; calculate luminance of the illuminator based at least on the optical property of the object; and adjust at least one of the illuminator, the image sensor, and the computer based at least on the luminance of the illuminator.