Applications of circular hough tranform,which can be shown practically in R2013?

need application of cht which i can implement by using matlab code .example:-pollen grain detection in air. but i am not getting right image which can be applied for the same..

Answer 1

[Image Analyst]

Why not try imfindcircles? It's easier. Here's a full blown demo of it by Brett at the Mathworks: http://www.mathworks.com/matlabcentral/fileexchange/34365-findcirclesgui