Vehicle Position Estimation Using Geometric Constants
in Trafc Scene
Determination of the correct positional relation is
vital for human driver. For unmanned vehicles, the obstacle
position in front of the view is also necessary for collision
detection. The paper is devoted to the problem that estimates the
vehicle position in real world using only a single 2D image. The
estimation is an ill-posed problem due to the proective
transform; however, through incorporating the geometric
constants in the trac scene, we proposed a solution that
calculates the position with sucient accuracy. The contribution
of the proposed method is the use of two geometric constants: the
standard size of license plate and the lane-width. Observation
shows that the size of license plates has limited patterns and
lane-width between two adacent lanes is usually constant.
Introduction of the two constants compensates the uncertainty
caused by lack of depth in the mapping between the detected
license plates and its position in real world. The conducted
experiments show that compared to the conventional methods,
the proposed one is accurate for estimating the position.