Fig. 2. Comparison of simulated soil images with real images. The size of each image is 1.6 by 1.2 cm. (a) Original soil image with anisotropic, linear pore structure. (b) Simulated image using the potential function; (c) simulated image using the scan scheme. (d) Original soil image containing pores of the order of the image size; (e) simulated image using the potential function; (f) simulated image using the scan scheme.