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The cropping algorithm steps. (a): Computing the height and width of the bounding box. (b): Adding k to the upper bound of the bounding box can capture the upper gingiva. (c): Expanding the upper and lower bounds of the bounding box. (d): A successful capture of the gingival area. (e): Narrowing the width of the bounding box to capture the “Big M” region. (f): A successful capture of the “Big M” region.
