Assigning labels to the detected points

I am working on tracking a human. I have calculated the centroid and points(Head,hands and legs). Depending on the image, these points can be at maximum 5 or at least 2 depending on the pose of the person. I want to assign labels like left leg,right leg, left hand, right hand and head to these points. But the problem is that unless i plot them i dont know which point is what. I want to use some logic like if its above centroid then head or below centroid then legs or some other idea/heuristics but i dont know if its possible in Matlab. I am attaching an image with detected points and centroid. I will appreciate if anyone can suggest some ideas.

Answer 1

[Image Analyst]

Yes, that's possible. Maybe you could use a structure array - one structure for each points. Like, do your logic to determine the body part, then if you're assigning the second point to Legs:

specialPoints(2).x = x;
specialPoints(2).y = y;
specialPoints(2).bodyPart = 'Legs';

Same for all the other points.

[BlueBee77]

Thanks alot for your reply. But how can i find if point is above or below centroid?

[Image Analyst]

Look at the y value of the centroid and compare to the y value of your other points. If the centroid y value is less, it's above the other point, if it's greater, the centroid y value is more than the others, it's below

for k = 1 : length(y)
    if y(k) > yCentroid
        fprintf('Point #%d, at y=%f, is below the centroid at y=%f.\n', k, y(k), yCentroid);
    else
        fprintf('Point #%d, at y=%f, is above the centroid at y=%f.\n', k, y(k), yCentroid);
    end
end

[BlueBee77]

THanks alot, i got the idea :)