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Figure 4
Example of the square localization procedure. (a) Original input image. (b) Mask recovered after segmenting pixels. (c) Finding convex polygons around the separate regions in the mask. (d) Aligned minimum bounding rectangles around the polygons, used for crops of the images.

IUCrJ
Volume 10| Part 1| January 2023| Pages 90-102
ISSN: 2052-2525
https://doi.org/10.1107/S2052252522010612