Measuring distance between centroid and perimeter points

My code currently allows me to draw three polygons on an image and then plot the centroid. How do I measure the distance between the centroid and each perimeter point?

Here is my current code:

close all, imshow(I),

for k = 1:3

title(['Polygon # ' int2str(k)]);

h = drawpolygon;

wait(h);

centroid=mean(h.Position);

drawpoint('Position',centroid,'Label','Centroid');

c{k}(1:2) = round([cx cy],0); % unit: pixels

c{k}(3) = round(area(polyin{k}),0)*p2cm; % unit: cm^2

disp(['Centroid of polygon: [' int2str([cx cy]) ']'])

disp(['Area of polygon = ' int2str(c{k}(3)) 'cm^2'])

end

Thanks!

Answer 1

[KSSV]

If C is your centroid coordinates and P is your m*2 array of points. Where m is the number of points. Then you can get the distance using:

d = sqrt((C(1)-P(:,1)).^2+(C(2)-P(:,2)).^2) ; 

Alo have a look on pdist2.