smooth edges

edit

but this will convert my image to grayscale.... i need it to b in RGB

Thats not even a problem! Do the edge detection operation on the gray image. Once you found the locations do the blurring operation on every image channel! :)

thanks i m trying to do so.... actually this is the first time i am using opencv ever in my life... so still in learning process... and my deadline to do the whole project is after 2 days.... and this edge refining/ smoothing is the last part where i m stuck

I understand how it is hard when you deal with it first time! At last if you found my answer correct and helpful please select the tik mark on the left side. :)

do u know any sample code to perform this ?

I'm sorry but I do not know a ready tutorial for this. But I think the pixel access tutorial(http://docs.opencv.org/doc/tutorials/core/how_to_scan_images/how_to_scan_images.html#howtoscanimagesopencv) and blurring tutorial(http://docs.opencv.org/doc/tutorials/core/mat-mask-operations/mat-mask-operations.html#maskoperationsfilter) would be helpful