Algorithm 1 Detection of key-body points human silhouette

Input: S: Segmented Human Silhouettes

Output: 8 key-body points as Head, Left-shoulder, Right-Shoulder, Left-arm, Right-arm, Left-foot, Right-foot, Torso.

B1 = boundary of left silhouette, B2 = boundary of right silhouette, H = height of silhouette, W = width of silhouette

% Extract boundaries of both silhouettes %

B = binarize(S);

BW = bwboundaries(B);

Object = detectobject(B,Boundingbox, Area)

% search boundaries of both silhouettes for outermost pixels %

fori = 1 to B1

forj = 1 to B2

Search (B1;B2)

Top_Pixel = [x, y_max];

Left_pixel = [x_min,y];

Rightl_pixel = [x_max,y];

Bottom_left_pixel = [x_min,y_min];

Bottom_right_pixel = [x_max,y_min];

end

end

% detect top, bottom, left and right region of both silhouettes %

% Repeat for both silhouettes %

[rows, cols] = size(object)

Top_half = floor(rows/2)

bottom_half = rows-Head_region

Head_region = floor(Top_half/3)

Torso_region = floor(Top_half-Head_region)

% identifying head region in top half of silhouette%

Head = Top_Pixel(Head_Region)

Left_Shoulder = Bottom_left_pixel(Head_Region)

Right_Shoulder = Bottom_right_pixel(Head_Region)

% identifying Torse, left arm and right arm%

Xt = (W/2)

Yt = (H/2)

Torso = (Xt, Yt)

Left_arm = Left_Pixel(Torso_region)

Right_arm = Right_Pixel(Torso_region)

% identifying left foot and right arm %

Left_foot = Bottom_left_pixel(bottom_half)

Right_foot = Bottom_right_pixel(bottom_half)

return Head, Left-shoulder, Right-Shoulder, Left-arm, Right-arm, Left-foot, Right-foot, Torso.