Semi-automatic Road Extraction with Meanshift Algorithm

We introduced Meanshfit algorithm to the road extraction in small scale aero-borne image by estimating the local maximum of the possibility distribution nearby the specified points.With the shadow kernel of the kernel function,the searching process will climb to the top along the gradient direction of the possibility densities with a fast convergence speed.We extracted the road points nearby the old road vectors for change detection,and traced the new road with a single initial point.Experiments prove the validities of this algorithm.