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Development and Application of Stereo Camera-Based Upper Extremity Workspace Evaluation in Patients with Neuromuscular Diseases

Figure 3

Hand trajectory is projected to spherical coordinates to obtain the outer boundaries of the concave bounding polygon using alpha shapes.

The boundary is applied to cut out the 3D spherical surface of the reachable envelope. For a control subject (A), the surface area lies in the interval of [π/2, 3π/2], while the surface area obtained in the patient with Pompe disease (B) is significantly reduced.

Figure 3