MATLAB Central Newsreader - 2D Phase Unwrapping with Minimum Cost Flow

2D Phase Unwrapping with Minimum Cost Flow

professor_rumsdiegeige@yahoo.com — Wed, 03 Sep 2008 09:04:27 -0400

Hello,

I am trying to implement Costantini's minimum cost flow algorithm (the
network programming approach) for 2D phase unwrapping.
Does anybody know a reference implementation, or can someone give me
help on that?

Many thanks in advance.
Regards
Sabine Lorentz

Re: 2D Phase Unwrapping with Minimum Cost Flow

Bruno Luong — Wed, 03 Sep 2008 09:40:20 -0400

professor_rumsdiegeige@yahoo.com wrote in message
<4070c98e-cbe0-40ca-9aab-9713f923c089@34g2000hsh.googlegroups.com>...
> Hello,
>
> I am trying to implement Costantini's minimum cost flow
algorithm (the
> network programming approach) for 2D phase unwrapping.
> Does anybody know a reference implementation, or can
someone give me
> help on that?
>

I don't know, but I'm interested in the 2D unwrapping
methods as well. If you can find a reference paper, I'm
willing to help with MATLAB implementation. Just contact me
if you are interested.

Thanks,

Bruno

Re: 2D Phase Unwrapping with Minimum Cost Flow

professor_rumsdiegeige@yahoo.com — Mon, 15 Sep 2008 14:33:53 -0400

On Sep 3, 11:40=A0am, "Bruno Luong" <b.lu...@fogale.findmycountry>
wrote:
> professor_rumsdiege...@yahoo.com wrote in message
>
> <4070c98e-cbe0-40ca-9aab-9713f923c...@34g2000hsh.googlegroups.com>...
>
> > Hello,
>
> > I am trying to implement Costantini's minimum cost flow
> algorithm (the
> > network programming approach) for 2D phase unwrapping.
> > Does anybody know a reference implementation, or can
> someone give me
> > help on that?
>
> I don't know, but I'm interested in the 2D unwrapping
> methods as well. If you can find a reference paper, I'm
> willing to help with MATLAB implementation. Just contact me
> if you are interested.
>
> Thanks,
>
> Bruno

Bruno,

I wrote a mail to you but maybe you didn't get the mail. Are you still
willing to help me, or is there anybody else?

Re: 2D Phase Unwrapping with Minimum Cost Flow

Bruno Luong — Mon, 15 Sep 2008 15:22:02 -0400

professor_rumsdiegeige@yahoo.com wrote in message <d4942026-bc60-42d1-b62b-7030adf43808@59g2000hsb.googlegroups.com>...

>
> I wrote a mail to you but maybe you didn't get the mail. Are you still
> willing to help me, or is there anybody else?

Sorry, I did not get the email. Could you please send me again. My email is <b.luong @ fogale . fr> (removed the spaces in the address).

Thanks,

Bruno

Re: 2D Phase Unwrapping with Minimum Cost Flow

professor_rumsdiegeige@yahoo.com — Tue, 16 Sep 2008 06:15:26 -0400

On Sep 15, 5:22=A0pm, "Bruno Luong" <b.lu...@fogale.findmycountry>
wrote:
> professor_rumsdiege...@yahoo.com wrote in message <d4942026-bc60-42d1-b62=
b-7030adf43...@59g2000hsb.googlegroups.com>...
>
> > I wrote a mail to you but maybe you didn't get the mail. Are you still
> > willing to help me, or is there anybody else?
>
> Sorry, I did not get the email. Could you please send me again. My email =
is <b.luong @ fogale . fr> (removed the spaces in the address).
>
> Thanks,
>
> Bruno

Ok, I sent the email again - looking forward to your response...
Thanks!

Re: 2D Phase Unwrapping with Minimum Cost Flow

Bruno Luong — Thu, 27 Aug 2009 17:05:13 -0400

Finally: http://www.mathworks.com/matlabcentral/fileexchange/25154

There are few details in Costantini's paper that sill escape me, notably the trick of converting integer optimization into a real one (integer solution is the real solution, but I believe the opposite is NOT true). Because of that, the "integration" step is not path-independent, and cause few stability issues during the numerical tests I have carried out.

It would be nice if someone here who fully grabs the method can shed a light.

Bruno

Re: 2D Phase Unwrapping with Minimum Cost Flow

Hua Wang — Mon, 05 Oct 2009 14:15:20 -0400

"Bruno Luong" <b.luong@fogale.findmycountry> wrote in message <h76ec9$buk$1@fred.mathworks.com>...
> Finally: http://www.mathworks.com/matlabcentral/fileexchange/25154
>
> There are few details in Costantini's paper that sill escape me, notably the trick of converting integer optimization into a real one (integer solution is the real solution, but I believe the opposite is NOT true). Because of that, the "integration" step is not path-independent, and cause few stability issues during the numerical tests I have carried out.
>
> It would be nice if someone here who fully grabs the method can shed a light.
>
> Bruno

Hi Bruno,

I have Costantini phd thesis about phase unwrapping. Have you had it already?

Cheers,
Hua