Sorry again. below is the image circ.png.
First i have to find the center(x,y) of the png image. using the center(x,y) of the png image file, i have draw a several circles with increasing radius until it covers the entire png image. the center of the circle should be at center of the png image. after drawing the circles, i have to count number of pixels in each circle. please help me in this regard.thanks in advance.