New Method of Shadow Elimination for Moving
Vehicle
Yuan Jiwei,Shi Zhongke
(Department of Automatic Control,Northwestern Polytechnical University,Xi'an 710072,China)
Abstract:Focusing on the problem that the reliability and real-time requirement for
eliminating cast shadow of moving vehicles are hard to be compatible,a new method based on
the difference between trap lines in color space was proposed.Through detecting the line
character of the four lines around the motion region,the vehicle/shadow model belonging to
the motion region was determined.Combining vehicle/shadow model with motion region the
trap line was found,and then the boundary points between vehicle and shadow were located
by using the attribute of trap lines and the difference between trap lines in the color
space.Furthermore,the shadow of the moving vehicle was eliminated by the boundary drawn
from the boundary points.Because of using the color character and the gray background of
the trap lines, it has stronger ability to restrain noise and improves the effect of
shadow elimination for vehicles with low pixel intensities.The results verify that the new
method is reliable,and its computation cost satisfies the real-time demands.
Keywords:difference between lines;shadow elimination;color space