how to draw a circle on specific points in an image???

plz helppppppp

Answer 1

[the cyclist]

If you just mean how to plot a circle in a figure, then this function will draw (an approximation to) a circle with a specified radius, at a specified (x,y) location. You can also specify the number of line segments that make up the circle.

function h = circle(x,y,r,nsegments)  

if nargin<4
    nsegments=50;
end

hold on
th = 0:2*pi/nsegments:2*pi;
xunit = r * cos(th) + x;
yunit = r * sin(th) + y;
h = plot(xunit, yunit);
hold off

end

I can't remember if I wrote this, or grabbed it off the File Exchange years ago, but there's no attribution in the file, so I can't give credit. You might search the FEX for other functions that may be better than this.

If you are talking more about image-processing, then I can't help you, except that I searched the FEX and found this:

http://www.mathworks.com/matlabcentral/fileexchange/23121-circle-on-image

[arooj]

Thanx alot.......... it helped me :)

[anurag bansal]

very very thanx

Answer 2

[shafaq]

meet me in uni i wil tel u its easy...