Method of detecting rain on a windscreen

摘要

The method involves using a camera (10) which is arranged inside a vehicle (13) opposite to windscreen and which is focused at infinity. The camera is also used for detecting a vehicle and edge of a path and/or for switching headlight of the vehicle from lighting mode to another mode. An image is acquired by the camera across the windscreen and an outline of task present on the image is extracted. A histogram is made from width of the outline. Independent claims are also included for the following: (1) a device for detecting rain drops on a windscreen (2) an information storage unit (3) a computer program on an information storage unit.