Image Labeling via OpenCV

edit

thanks, but it should work in an automatic mode...(visual servoing). it was told me to check "cvFloodFill" OpenCV function...doesn't it make something similar?

Then what you actually need, is an automatic segmentation of the area into possible regions? Then google the watershed algorithm. It is what the cvFloodFill applies internally.

thanks again...why can I not use directly the function cvFloodFill?

you could use the functionality, but I do not know by head how this function works. So you should look it up :)

thanks for the answer, but i would like to remain in OpenCV environment: i need this function to implement a visual servoing control of robots..so i should use it as a part of a bigger program and not as a tool.