java - Find bounding points 2D with an "H" shape -

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i've got set of points represent form this:

enter image description here

as drawn on picture, able detect points bounding "h" shape. there algorithm solve problem?

i know there graham scan use, graham scan take points outside cloud of points.

there alpha shape algorithm build non-convex hulls. if point cloud formed (vertical sticks of h divided , on...), may try build alpha shape, correct rectilinear figure.

enter image description here


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