Perspective Correction in ImageJ

[GAUTAM SHANKAR]

Hi,

I'm looking for a way to fix perspective. I think skewing the image would
fix it.

I have an object which goes like   \  /  and I want to straighten it out to
| |

I'm guessing stretching the entire image outwards by the bottom left and
right corners by some degree will fix the perspective.

Is there any way I could do this in imageJ? Are there any keywords you can
tell me where I cold find a formula or algorithm that does this? Thanks.

-Gautam Shankar

[Ignacio Arganda-Carreras]

Hello Gautam,

You can manually do it using Stephan Saalfeld plugin:

http://pacific.mpi-cbg.de/wiki/index.php/Interactive_Perspective

<http://pacific.mpi-cbg.de/wiki/index.php/Interactive_Perspective>Cheers,

ignacio

On Wed, Jun 23, 2010 at 12:27 PM, GAUTAM SHANKAR <[hidden email]>wrote:

> Hi,
>
> I'm looking for a way to fix perspective. I think skewing the image would
> fix it.
>
> I have an object which goes like   \  /  and I want to straighten it out to
> | |
>
> I'm guessing stretching the entire image outwards by the bottom left and
> right corners by some degree will fix the perspective.
>
> Is there any way I could do this in imageJ? Are there any keywords you can
> tell me where I cold find a formula or algorithm that does this? Thanks.
>
> -Gautam Shankar
>

--
Ignacio Arganda-Carreras, Ph.D.
Seung's lab, 46-5065
Department of Brain and Cognitive Sciences
Massachusetts Institute of Technology
43 Vassar St.
Cambridge, MA 02139
USA

Phone: [phone]
Website: http://bioweb.cnb.csic.es/~iarganda/index_EN.html

[GAUTAM SHANKAR]

is there no way to write a macro/script to move the points? The macro
recorder doesn't pick up anything when I move the control points for
transform perspective.

thank you so much Ignacio.

-Gautam Shankar

On Wed, Jun 23, 2010 at 9:38 AM, Ignacio Arganda-Carreras <
[hidden email]> wrote:

> Hello Gautam,
>
> You can manually do it using Stephan Saalfeld plugin:
>
> http://pacific.mpi-cbg.de/wiki/index.php/Interactive_Perspective
>
> <http://pacific.mpi-cbg.de/wiki/index.php/Interactive_Perspective>Cheers,
>
> ignacio
>
> On Wed, Jun 23, 2010 at 12:27 PM, GAUTAM SHANKAR <[hidden email]
> >wrote:
>
> > Hi,
> >
> > I'm looking for a way to fix perspective. I think skewing the image would
> > fix it.
> >
> > I have an object which goes like   \  /  and I want to straighten it out
> to
> > | |
> >
> > I'm guessing stretching the entire image outwards by the bottom left and
> > right corners by some degree will fix the perspective.
> >
> > Is there any way I could do this in imageJ? Are there any keywords you
> can
> > tell me where I cold find a formula or algorithm that does this? Thanks.
> >
> > -Gautam Shankar
> >
>
>
>
> --
> Ignacio Arganda-Carreras, Ph.D.
> Seung's lab, 46-5065
> Department of Brain and Cognitive Sciences
> Massachusetts Institute of Technology
> 43 Vassar St.
> Cambridge, MA 02139
> USA
>
> Phone: [phone]
> Website: http://bioweb.cnb.csic.es/~iarganda/index_EN.html<http://bioweb.cnb.csic.es/%7Eiarganda/index_EN.html>
>

[Ignacio Arganda-Carreras]

Hello again Gautam,

Not an easy way at least. You should go further into the code and see how
Stephan applies the transformation when you click ENTER:

http://pacific.mpi-cbg.de/cgi-bin/gitweb.cgi?p=mpicbg.git;a=blob;f=mpicbg/ij/InteractiveInvertibleCoordinateTransform.java;h=23b3a236718a70e1ec49b712e05e30fca4363d9f;hb=HEAD

<http://pacific.mpi-cbg.de/cgi-bin/gitweb.cgi?p=mpicbg.git;a=blob;f=mpicbg/ij/InteractiveInvertibleCoordinateTransform.java;h=23b3a236718a70e1ec49b712e05e30fca4363d9f;hb=HEAD>
ignacio

On Thu, Jun 24, 2010 at 12:56 PM, GAUTAM SHANKAR <[hidden email]>wrote:

> is there no way to write a macro/script to move the points? The macro
> recorder doesn't pick up anything when I move the control points for
> transform perspective.
>
> thank you so much Ignacio.
>
> -Gautam Shankar
>
> On Wed, Jun 23, 2010 at 9:38 AM, Ignacio Arganda-Carreras <
> [hidden email]> wrote:
>
> > Hello Gautam,
> >
> > You can manually do it using Stephan Saalfeld plugin:
> >
> > http://pacific.mpi-cbg.de/wiki/index.php/Interactive_Perspective
> >
> > <http://pacific.mpi-cbg.de/wiki/index.php/Interactive_Perspective
> >Cheers,
> >
> > ignacio
> >
> > On Wed, Jun 23, 2010 at 12:27 PM, GAUTAM SHANKAR <[hidden email]
> > >wrote:
> >
> > > Hi,
> > >
> > > I'm looking for a way to fix perspective. I think skewing the image
> would
> > > fix it.
> > >
> > > I have an object which goes like   \  /  and I want to straighten it
> out
> > to
> > > | |
> > >
> > > I'm guessing stretching the entire image outwards by the bottom left
> and
> > > right corners by some degree will fix the perspective.
> > >
> > > Is there any way I could do this in imageJ? Are there any keywords you
> > can
> > > tell me where I cold find a formula or algorithm that does this?
> Thanks.
> > >
> > > -Gautam Shankar
> > >
> >
> >
> >
> > --
> > Ignacio Arganda-Carreras, Ph.D.
> > Seung's lab, 46-5065
> > Department of Brain and Cognitive Sciences
> > Massachusetts Institute of Technology
> > 43 Vassar St.
> > Cambridge, MA 02139
> > USA
> >
> > Phone: [phone]
> > Website: http://bioweb.cnb.csic.es/~iarganda/index_EN.html<
> http://bioweb.cnb.csic.es/%7Eiarganda/index_EN.html>
> >
>

--
Ignacio Arganda-Carreras, Ph.D.
Seung's lab, 46-5065
Department of Brain and Cognitive Sciences
Massachusetts Institute of Technology
43 Vassar St.
Cambridge, MA 02139
USA

Phone: [phone]
Website: http://bioweb.cnb.csic.es/~iarganda/index_EN.html