David Young

Hi narjes, The call to circle_hough has too many input arguments. Have a close look at it and compare it with the examples in the demo. If you need more help, please post the code that calls circle_hough.

Hi Huanhuan. You need to download all the files in the submission and put them in a directory on your MATLAB path. It looks like you didn't download circlepoints.m.

Hi Andri. That's not easy, and the solution depends on what your images look like - for example are the ellipses all very flattened, or are some of them close to being circles? If you have a general set of shapes, you probably need to use some kind of ellipse detector (not necessarily a Hough Transform) to find them. This will detect circles too, but you can then distinguish circles from ellipses simply on the basis of the aspect ration. I'm sorry, but my circle detector will probably not be very useful in the general case.

hi David, when i use this code
some errors appear like :

?? Error using ==> nargchk
Too many input arguments.

Error in ==> C:\MATLAB6p5\work\circle_hough.m
On line 40 ==> error(nargchk(2, 2+length(opts), nargin, 'struct'));
could you help me please??

Hi Dave, a quick update. The log-sample routine works fine for phase correlation too. Thanks,G