Patent ID: 8422736

Claim:
Method of producing lane information for use in a map database comprising: acquiring one or more source images of a road surface and associated position and orientation data, the road having a direction and lane markings parallel to the direction of the road; acquiring road information representative of the direction of said road; transforming the one or more source images to obtain a transformed image in dependence of the road information, wherein each column of pixels of the transformed image corresponds to a surface parallel to the direction of said road; applying a filter with asymmetrical mask on the transformed image to obtain a filtered image; and, producing lane information from the filtered image in dependence of the position and orientation data associated with the one or more source images; wherein the one or more source images have been obtained by: retrieving one or more image sequences obtained by means of one or more terrestrial based cameras mounted on a moving vehicle driving on the road and associated position and orientation data; and performing a normalization process on the one or more image sequences to obtain the one or more images and position and orientation data associated with said one or more images.