The present invention discloses a lane departure warning method, which
functions to choose the data acquiring source according to brightness of
the environment surrounding a vehicle and weather status so as to reduce
the erroneous judgment of lane departure during image processing and
analyzing. In addition, the present invention also presents a lane
departure warning apparatus using the foregoing method, which comprises
at least a first information acquisition unit, at least a second
information acquisition and a information processing/information
processing/controlling unit. The first information acquisition unit
disposed on the vehicle is capable of capturing the image around the
vehicle while the second information acquisition unit disposed on the
bottom of the vehicle is capable of capturing image under the bottom of
the vehicle. The image acquired from the first information acquisition
unit and the second information acquisition unit is then sent to the
processing and information processing/controlling unit for data
processing.