Abstract: In view of the traditional gray correction method little effect on correcting global illumination uneven pavement image,it proposed a method of correcting uneven illumination image based on samplinig window.According to the correlation of adjacent pixels pavement image as well as their non-uniform imaging principle,the algorithm calcuated background grey factor point using image mean and residual image,and then obtained corrected image using the linear transformation method.Simulation results show that the algorithm can effectively reduce image non-uniform illumination and correct the image.