how can i generate a circle function?

Now i have an image in binary form. Using blob index i have cropped it. Next i have to form a circle on the image and from the circle i have to come out with pixel values information. So how can i generate a circle function for this?

Answer 1

[Image Analyst]

See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_create_a_circle.3F

Answer 2

[Shasha Glow]

Actually i want to create the circle on BINARY IMAGE. Where the circle can be adjustable means it must be able to become small or big.

[Image Analyst]

Try imellipse(). Let me know if you need a demo other than the one in the help.

[Shasha Glow]

yes i need demo