Figure 3

The road extraction results. The road extraction results. (a) The first TerraSAR-X image representing the scene around an airport. (b) The road candidates detected by MLFD. In the decomposition, the complexity-penalized coefficient λ is set to 0.6 and the segments with the response less than 0.6 are discarded. (c) The detection results of fusion operator[7]. The response threshold is set to 0.3 and segments that are less than 5 are removed. (d) Another results by fusion operator with a larger template size. (e) the result by unbiased detector[22]. (f) The detection results of wedgelets. The complexity-penalized coefficient and threshold are 5 and 1, respectively. (g) The segments detected by beamlets. (h) The road network reconstructed after MRF optimization. (i) The ground truth.