Fig 1.
Framework diagram of the proposed method.
Fig 2.
Illustration of intensity differences in overlapping regions.
Fig 3.
Superpixel merging process based on the RAG.
(a) Adjacency relationships among superpixels. (b) Initial region adjacency graph. (c) Region adjacency graph after merging.
Fig 4.
Voronoi diagram construction process.
(a) Seed points. (b) Delaunay triangulation. (c) Voronoi diagram construction. (d) Voronoi diagram.
Fig 5.
AVDO Illustration.
Fig 6.
Illustration of Valid Regions.
(a) Orthorectified SAR image. (b) Contour lines of valid regions.
Fig 7.
Illustration of Overlapping Area Extraction.
(a) Searching Process. (b) Overlapping Area.
Fig 8.
Skeleton Lines of Overlapping Regions.
Fig 9.
Initial seamline network among multiple SAR images.
Fig 10.
Optimization of Network Nodes.
(a) Intersection points of skeleton lines in overlapping regions. (b) Optimized network nodes.
Fig 11.
Segmentation results of the PB-SLIC algorithm.
(a) Segmentation result of image A. (b) Segmentation result of image B. (c) Overlay of the two segmentation results.
Fig 12.
Segmentation results of the proposed algorithm.
(a) Segmentation result of image A. (b) Segmentation result of image B.
Fig 13.
Results of Superpixel Merging and Candidate Seamline Extraction.
(a) Before merging. (b) After merging. (c) Candidate seamlines.
Fig 14.
Extraction of the Optimal Seamline.
(a) Left image, with the blue area representing the overlapping region. (b) Right image, with the blue area representing the overlapping region. (c) Cost matrix. (d) Candidate seamline. (e) Refined result: green curves indicate candidate seamlines, black dots represent network nodes, and red curves indicate the optimal seamline. (f) Illustration of the optimal seamline overlaid on the images to be mosaicked: red curves show the optimal seamline, and the blue area represents the overlapping region.
Fig 15.
Data Coverage.
Table 1.
Data Information.
Fig 16.
(a) Initial seamline network. (b) Result of the method proposed by Pan et al. (c) Result of the method proposed by Wang et al. (d) Result of the proposed method in this study.
Fig 17.
(a1–h1) Enlarged local details of the initial seamline network, corresponding to the red boxes in Fig 16(a). (a2–h2) Enlarged local details of the results from Pan et al.’s method, corresponding to the red boxes in Fig 16(b). (a3–h3) Enlarged local details of the results from Wang et al.’s method, corresponding to the red boxes in Fig 16(c). (a4–h4) Enlarged local details of the results from the proposed method in this study, corresponding to the red boxes in Fig 16(d).
Table 2.
Quantitative Metric Results.