Circular mask and its division

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Devraj Mandal
Devraj Mandal 2013-6-10
Hi all,
I need to draw a circle as the initial level set . Then I am required to draw the semi-diameters of the circle for every center angle (pi/360) and randomly selecting 20 points on every diameter.
A circular mask is easily drawn. I have used this code:
[y x] = meshgrid(1:100,1:100);
m = ((radius).^2)-((x-xcen).^2)-((y-ycen).^2)>radius;
%To make it a signed distance function I have further used the command
initial_level_set = bwdist(m)-bwdist(1-m)+im2double(m)-.5;
I cannot able to draw the semi - circles and extract those points.
Any help will be greatly appreciated.
Thanks all!

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