Fig. 1. Schematic diagram of image segmentation process of fractal network evolution algorithm. (a) Merge step 1; (b) merge step 2

Fig. 2. Schematic diagram of quadtree segmentation algorithm. (a) Process diagram for segmentation; (b) schematic diagram of segmentation

Fig. 3. Flow chart of remote sensing image classification algorithm combining quadtree structure and scale estimation

Fig. 4. Image of the first group of experiments. (a) Building experimental area; (b) wasteland experimental area; (c) road experimental area; (d) water experimental area

Fig. 5. Image change rate-local variance map of experimental area. (a) Building experimental area; (b) wasteland experimental area; (c) road experimental area; (d) water experimental area

Fig. 6. Local variance histogram. (a) Building experimental area; (b) wasteland experimental area; (c) road experimental area; (d) water experimental area

Fig. 7. Variation diagram of classification accuracy in experimental area. (a) Building experimental area; (b) wasteland experimental area

Fig. 8. Second group of experimental image

Fig. 9. Image segmentation result。(a) Overall division result; (b) refined division result 1; (c) refined division result 2

Fig. 10. Schematic diagram of area division by quadtree algorithm. (a) The first partition result; (b) the second division result; (c) the third division result; (d) final division result

Fig. 11. Remote sensing image segmentation result combining quadtree structure and scale estimatio. (a) Quadtree algorithm partitioning result; (b) image segmentation result

Fig. 12. Region segmentation (a) and direct segmentation (b) of classified images