Adding binary matrices generated in while loop

I am writing a program that, in a nutshell, detects multiple circular objects in an image and then classifies them based on their color. To identify the circles, I use:

[centers1, radii1] = imfindcircles(imgd,[8 20],'ObjectPolarity','dark','Sensitivity',0.92);

I then use a while loop to define each circle and create a binary mask that can be used to identify where each circle is. I do this by referencing the matrices that hold the radii and center values identified in the previous function.

[rr, cc] = meshgrid(1:600);

LoopCounter = 1;

while LoopCounter <= RadiusSize(1)

      % Defines circles using centers and radii, generates circle template
      maska = +(sqrt((rr-centers1(LoopCounter,1)).^2+(cc-centers1(LoopCounter,2)).^2) <= radii1(LoopCounter,1));

      %
      LoopCounter = LoopCounter + 1;
end

The while loop generates a series of binary matrices ("templates") for each circle. I want to be able to add these matrices together to create one master "template", which I can then multiply by the original image to eliminate the background around the identified circles.

Suggestions?

[Meghana Dinesh]

Using a while loop isn't a very efficient way. Could you share an example image? Do the circles overlap? If the circle circumference co-ordinates are known, You can just fill (with white) the circles using:

I2 = imfill(I,'holes')

Background will be black.

Answer 1

[Thorsten]

Just add the masks. And use a for loop instead of a while:

 mask = zeros(size(rr));
 for i = 1:numel(radii1)
   maska = maska + sqrt((rr-centers1(i,1)).^2+(cc-centers1(i,2)).^2) <= radii1(i,1);
 end