Fig. 1. High-resolution remote sensing image

Fig. 2. Road extraction process. (a) Image mathematical morphology processing result; (b) image EM clustering result; (c) image contour detection result; (d) road extraction result

Fig. 3. Processing results of experimental data 1. (a) Original picture; (b) image contour detection result; (c) road extraction result; (d) extraction results are superimposed on original image

Fig. 4. Processing results of experimental data 2. (a) Original picture; (b) image contour detection result; (c) road extraction result; (d) extraction results are superimposed on original image

Fig. 5. Extraction effects of traditional method. Extraction results of (a)data 1 and (b) data 2 obtained by Hongh transformation based method; extraction results of (c)data 1 and (d) data 2 obtained by watershed threshold segmentation combined with shape features

Fig. 6. Test set data and extraction results. (a) Test set data 1; (b) test set data 2; (c) test set data 3; (d) extraction result of test set data 1; (e) extraction result of test set data 2; (f) extraction result of test set data 3