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Thread Subject:
2D Phase Unwrapping Algorithms

Subject: 2D Phase Unwrapping Algorithms

From: Kumar Kumar

Date: 19 Aug, 2009 01:05:25

Message: 1 of 7

Hi All,

just enquiring to find out if anyone on the net has implemented
a specifiec 2D phase unwrapping algorithm as proposed by Mark Jenkinson as part of the FSL analysis tools.

The algorithm is called PRELUDE and is described in the paper 'Fast, Automated, N-Dimensional Phase-Unwrapping Algorithm'.

I have tried to implement this algorithm in Matlab for the past few weeks, but I have so many short-comings and errors with my implementation(s) that I am at my wits end.

If anyone has attempted this algorithm or has a working implementation or any advice on how to approach the finding of the pixel pairs from different regions could you please contact me:

vee kay underscore dre @ ya who dot co dot nz

Much appreciated!

Many thanks!

Subject: 2D Phase Unwrapping Algorithms

From: Kumar Kumar

Date: 20 Aug, 2009 06:09:02

Message: 2 of 7

Any one?

Subject: 2D Phase Unwrapping Algorithms

From: S?ren Haack

Date: 10 Sep, 2009 08:53:01

Message: 3 of 7

"Kumar Kumar" <none@none.com> wrote in message <h6fj4l$etg$1@fred.mathworks.com>...
> Hi All,
>
> just enquiring to find out if anyone on the net has implemented
> a specifiec 2D phase unwrapping algorithm as proposed by Mark Jenkinson as part of the FSL analysis tools.
>
> The algorithm is called PRELUDE and is described in the paper 'Fast, Automated, N-Dimensional Phase-Unwrapping Algorithm'.
>
> I have tried to implement this algorithm in Matlab for the past few weeks, but I have so many short-comings and errors with my implementation(s) that I am at my wits end.
>
> If anyone has attempted this algorithm or has a working implementation or any advice on how to approach the finding of the pixel pairs from different regions could you please contact me:
>
> vee kay underscore dre @ ya who dot co dot nz
>
> Much appreciated!
>
> Many thanks!

Hi,
Did you ever get a respons on this one? Or did you find another solution/implementation of the algorithm? I also have an interest in this.
Thanks in advance

Subject: 2D Phase Unwrapping Algorithms

From: Sjoerd Crijns

Date: 31 Oct, 2009 10:13:02

Message: 4 of 7

"S?ren Haack" <soeren.haack@stab.rm.dk> wrote in message <h8aepd$2tk$1@fred.mathworks.com>...
> "Kumar Kumar" <none@none.com> wrote in message <h6fj4l$etg$1@fred.mathworks.com>...
> > Hi All,
> >
> > just enquiring to find out if anyone on the net has implemented
> > a specifiec 2D phase unwrapping algorithm as proposed by Mark Jenkinson as part of the FSL analysis tools.
> >
> > The algorithm is called PRELUDE and is described in the paper 'Fast, Automated, N-Dimensional Phase-Unwrapping Algorithm'.
> >
> > I have tried to implement this algorithm in Matlab for the past few weeks, but I have so many short-comings and errors with my implementation(s) that I am at my wits end.
> >
> > If anyone has attempted this algorithm or has a working implementation or any advice on how to approach the finding of the pixel pairs from different regions could you please contact me:
> >
> > vee kay underscore dre @ ya who dot co dot nz
> >
> > Much appreciated!
> >
> > Many thanks!
>
> Hi,
> Did you ever get a respons on this one? Or did you find another solution/implementation of the algorithm? I also have an interest in this.
> Thanks in advance

It's in the FSL package, which is freely available and written in C++. The source code is also available so you can play around with it. Why not try that?

Subject: 2D Phase Unwrapping Algorithms

From: Andreas

Date: 29 Sep, 2011 10:47:10

Message: 5 of 7

Hello,

looking at prelude and fsl, I wondered, If somebody used this algorithm in matlab without using some nifti files? Maybe just using a 3D block, array as input for an matlab function or algorithm? Maybe with an adapted C-Programm?

Does anyone have some code fragments, as I want to evaluate the algorithm of 3D arrays in Matlab...

Many thanks!

Andreas

"Sjoerd Crijns" <scrijns@gmail.com> wrote in message <hch2je$8pt$1@fred.mathworks.com>...
> "S?ren Haack" <soeren.haack@stab.rm.dk> wrote in message <h8aepd$2tk$1@fred.mathworks.com>...
> > "Kumar Kumar" <none@none.com> wrote in message <h6fj4l$etg$1@fred.mathworks.com>...
> > > Hi All,
> > >
> > > just enquiring to find out if anyone on the net has implemented
> > > a specifiec 2D phase unwrapping algorithm as proposed by Mark Jenkinson as part of the FSL analysis tools.
> > >
> > > The algorithm is called PRELUDE and is described in the paper 'Fast, Automated, N-Dimensional Phase-Unwrapping Algorithm'.
> > >
> > > I have tried to implement this algorithm in Matlab for the past few weeks, but I have so many short-comings and errors with my implementation(s) that I am at my wits end.
> > >
> > > If anyone has attempted this algorithm or has a working implementation or any advice on how to approach the finding of the pixel pairs from different regions could you please contact me:
> > >
> > > vee kay underscore dre @ ya who dot co dot nz
> > >
> > > Much appreciated!
> > >
> > > Many thanks!
> >
> > Hi,
> > Did you ever get a respons on this one? Or did you find another solution/implementation of the algorithm? I also have an interest in this.
> > Thanks in advance
>
> It's in the FSL package, which is freely available and written in C++. The source code is also available so you can play around with it. Why not try that?

Subject: 2D Phase Unwrapping Algorithms

From: Bruno Luong

Date: 29 Sep, 2011 12:20:11

Message: 6 of 7

"Andreas" wrote in message <j61ibe$fhf$1@newscl01ah.mathworks.com>...
> Hello,
>
> looking at prelude and fsl, I wondered, If somebody used this algorithm in matlab without using some nifti files? Maybe just using a 3D block, array as input for an matlab function or algorithm? Maybe with an adapted C-Programm?
>
> Does anyone have some code fragments, as I want to evaluate the algorithm of 3D arrays in Matlab...
>
> Many thanks!
>
> Andreas

One of the obstacles is that mulch-dimensional unwrapping algorithm is heavily loop with plenty of tests. Only C-implementation is efficient. I'm not aware of any decent Matlab implementation.

Bruno

Subject: 2D Phase Unwrapping Algorithms

From: Andreas

Date: 6 Oct, 2011 12:58:10

Message: 7 of 7

"Bruno Luong" <b.luong@fogale.findmycountry> wrote in message <j61npq$4ua$1@newscl01ah.mathworks.com>...
> "Andreas" wrote in message <j61ibe$fhf$1@newscl01ah.mathworks.com>...
> > Hello,
> >
> > looking at prelude and fsl, I wondered, If somebody used this algorithm in matlab without using some nifti files? Maybe just using a 3D block, array as input for an matlab function or algorithm? Maybe with an adapted C-Programm?
> >
> > Does anyone have some code fragments, as I want to evaluate the algorithm of 3D arrays in Matlab...
> >
> > Many thanks!
> >
> > Andreas
>
> One of the obstacles is that mulch-dimensional unwrapping algorithm is heavily loop with plenty of tests. Only C-implementation is efficient. I'm not aware of any decent Matlab implementation.

Yes of course... therefore I don't look for an matlab implementation.... I look for a simply way to get my 3dimensional matlab array in the prelude algorithm without creating any nifti files...

Thanks

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