Figure 13
From: Hand posture recognition using jointly optical flow and dimensionality reduction
Blue hand and steps of the proposed method. (a) Processed image. (b) Moving points, fitting ellipse (indicated by red dots and a red ellipse), and center of mass (indicated by a red square). (c) Threshold image I Th in the ROI defined from the fitting ellipse. (d) Result obtained after mathematical morphology operations. (e) I f-square ROI whose height is the maximum Ferret diameter of the hand. (f) I c, obtained from Roberts linear filtering, containing the expected hand contour.