Lane departure warning method and apparatus

A lane departure warning method for automatically detecting lane departures of a vehicle, comprising the steps of:

• providing at least a first information acquisition unit and at least a second information acquisition unit, while enabling each of the at least one first information acquisition unit to acquire information relating to an environment surrounding the vehicle, and each of the at least one second information acquisition unit to be being disposed at the bottom of the vehicle for acquiring information relating to the ambient of the vehicle's bottom;
• using the image information acquired by the at least one first information acquisition unit to generate an image signal;
• performing an environment evaluation upon the image signal for interpreting and defining the ambient environment of the vehicle;
• and
• basing on the interpretation of the environment evaluation to select one acquired information from the group consisting of the information acquired by the at least one first information acquisition unit, the information acquired by the at least one second information acquisition unit, and the combination thereof while using the selected information to perform a lane departure evaluating process.