How can i create an image with randomly distributed filled circles (not only the contours), having different colours?

hello, i have been trying to create an image with randomly distributed circles, (that i have to analyze with other codes at a later stage) using this code:

imageSizeX = 640;
imageSizeY = 480;
[columnsInImage rowsInImage] = meshgrid(1:imageSizeX, 1:imageSizeY);
% Next create the circle in the image.
circles=[];
X=[];
Y=[];
radii=[];

for i=1:10
n =rand(1);
centerX(i) = 320*n;
X=[X centerX(i)];
centerY(i) = 240*n;
Y=[Y centerY(i)];
radius(i) = 100*n;
radii=[radii radius(i)];
end

circles=[];

for i=1:10
circlePixels(:,:,i) = (rowsInImage - Y(i)).^2 ...
      + (columnsInImage - X(i)).^2 <= radius(i).^2;
  circles=[circles circlePixels(:,:,i)];
end

image(circlePixels(:,:,1:10)) ; 
colormap([0 0 0; 0.5 0.5 0.5]);

However it seems that this is the wrong way since i always get the error. Does anyone have any idea of how i can do this?

Answer 1

[jonas]

You could try using viscircles

% image size
xres = 640;
yres = 480;

% radii & centers
n = 200;
rr = rand(n,1).*5
xc = rand(n,1).*xres;
yc = rand(n,1).*yres;

% Circles
viscircles([xc,yc],rr)
xlim([0 xres])
ylim([0 yres])
set(gca,'xcolor','none','ycolor','none')

% Save as image
I = getframe(gca)

% Show image
imshow(I.cdata)