Sarin Sukumar A wrote:
> i did convolution of the picture with itself, but i got only one peak
> in the center of the picture

Of course, what did you expect?  What you did was a special kind of
convolution called a "auto-correlation".  You always get the maximum value
in the center.  When you do auto-correlations for the right reasons, you are
usually looking for peaks in other places to get a idea of repetitive
signals.

In any case now that you've shown us a picture, I don't think anything as
heavyweight as a bunch of convolutions is necessary.  I would first play
with the lighting to get maximum contrast between the background and any
bubbles.  It looks like OK results could be obtained even with your current
setup, but a little tweaking should decrease errors.


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