From an image mask, it calcultates the hull area of the unmasked object
hull_area_from_masks(img)
| img | A two-dimensional matrix representing an image mask. Any non-zero pixel is considered as part of the oject that wants to be encapsulated. |
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The area (in pixels) of the convex hull
The mask must be a two-dimensional matrix where 0 values indicate masked pixels, and non-zero values unmasked (selected) pixels. The convex hull is the smallest convex polygon that encapsulates all the unmasked pixels, and this function returns the area of that polygon