Geoffrey

Great example for understanding techniques!

Thank you very much for your fast answer!

The segmentation and Hough line tools are working very well but there is still some minor bug;

When I use any function all the titles are flipped upside down like that :
http://image.noelshack.com/fichiers/2013/10/1362583889-sans-titre.png

And the find-circles function doesn't work, i get the error message:
----------------------------------------------------------
Error using imread (line 368)
File "file_open.png" does not exist.

Error in FindCirclesGUI (line 71)
tmp =
im2double(imread('file_open.png'));

Error in SegmentTool/LaunchFindCirclesGUI (line 1784)
FindCirclesGUI(get(imhandles(workingax),'cdata'))

Error while evaluating uicontrol Callback
----------------------------------------------------------

I try to call my file like 'file_open.png' but it still doesn't works...

Thank you again for using your time.
Cordially, Geoffrey