Re: [PD] fish eye camera distortion correction

[Christof Ressi]

Personally, I would always prefer a fragment shader over fiddling with curve3d in GEM :-) This is probably what you want: https://www.geeks3d.com/20140213/glsl-shader-library-fish-eye-and-dome-and-barrel-distortion-post-processing-filters/5/

 

It might need some modification depending on the kind of texture and GLSL version your using.

 

Christof

 

 

Gesendet: Mittwoch, 17. Juli 2019 um 21:27 Uhr
Von: "Csaba Láng" 
An: pd-list@lists.iem.at
Betreff: Re: [PD] fish eye camera distortion correction



Thanks for the ideas.


Luckily I will snap the pix just once a second or two. Hope the processor can handle it.

Which correction is easier, curve3d or the shader?

 

On Wed, 17 Jul 2019 at 21:04, Jack  wrote:

Sure, use a framebuffer with [gemframebuffer] to capture offscreen your
scene.
The problem is to send back your texture produce by [gemframebuffer] in
pix_ domain to use [pix_movement] and [pix_multiblob], fortunately there
is [pix_snap] for this (this process is quite slow, it depends on your
hardware).
Look at :
Help => Gem => examples => 04.pix/ => 26.framebuffer_readback.pd
to see how to use it.

A note, instead off [curve3d] it is also possible to use shaders (on
fragment) to do the correction of the lens distorsion.
++

Jack



Le 17/07/2019 à 20:36, Csaba Láng a écrit :
> Looks good, but now a bigger problem came up.
>
> My aim is to correct the fish eye distortion for pix_movement and
> pix_multiblob analyses.
> Which means first I have to make the curve3d correction and then use
> those pixels in pix_multiblob.
> Is it possible?
>
> On Wed, Jul 17, 2019 at 8:16 PM Johnny Mauser
> > wrote:
>
>     Maybe gems [curve3d]? 
>
>     Csaba Láng >
>     schrieb am Mi., 17. Juli 2019, 20:10:
>
>         Hi list,
>         is there an easy way to correct fish eye camera image distortion?
>         I think if a vortex kind of tool.
>         Best,
>         Popesz
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Re: [PD] fish eye camera distortion correction

[Csaba Láng]

Thanks for the ideas.
Luckily I will snap the pix just once a second or two. Hope the processor
can handle it.
Which correction is easier, curve3d or the shader?

On Wed, 17 Jul 2019 at 21:04, Jack  wrote:

> Sure, use a framebuffer with [gemframebuffer] to capture offscreen your
> scene.
> The problem is to send back your texture produce by [gemframebuffer] in
> pix_ domain to use [pix_movement] and [pix_multiblob], fortunately there
> is [pix_snap] for this (this process is quite slow, it depends on your
> hardware).
> Look at :
> Help => Gem => examples => 04.pix/ => 26.framebuffer_readback.pd
> to see how to use it.
>
> A note, instead off [curve3d] it is also possible to use shaders (on
> fragment) to do the correction of the lens distorsion.
> ++
>
> Jack
>
>
>
> Le 17/07/2019 à 20:36, Csaba Láng a écrit :
> > Looks good, but now a bigger problem came up.
> >
> > My aim is to correct the fish eye distortion for pix_movement and
> > pix_multiblob analyses.
> > Which means first I have to make the curve3d correction and then use
> > those pixels in pix_multiblob.
> > Is it possible?
> >
> > On Wed, Jul 17, 2019 at 8:16 PM Johnny Mauser
> > mailto:joson.andr...@googlemail.com>>
> wrote:
> >
> > Maybe gems [curve3d]?
> >
> > Csaba Láng mailto:langcs...@gmail.com>>
> > schrieb am Mi., 17. Juli 2019, 20:10:
> >
> > Hi list,
> > is there an easy way to correct fish eye camera image distortion?
> > I think if a vortex kind of tool.
> > Best,
> > Popesz
> > ___
> > Pd-list@lists.iem.at  mailing list
> > UNSUBSCRIBE and account-management ->
> > https://lists.puredata.info/listinfo/pd-list
> >
> >
> > ___
> > Pd-list@lists.iem.at mailing list
> > UNSUBSCRIBE and account-management ->
> https://lists.puredata.info/listinfo/pd-list
> >
>
>
>
>
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Re: [PD] fish eye camera distortion correction

[Jack]

Sure, use a framebuffer with [gemframebuffer] to capture offscreen your
scene.
The problem is to send back your texture produce by [gemframebuffer] in
pix_ domain to use [pix_movement] and [pix_multiblob], fortunately there
is [pix_snap] for this (this process is quite slow, it depends on your
hardware).
Look at :
Help => Gem => examples => 04.pix/ => 26.framebuffer_readback.pd
to see how to use it.

A note, instead off [curve3d] it is also possible to use shaders (on
fragment) to do the correction of the lens distorsion.
++

Jack



Le 17/07/2019 à 20:36, Csaba Láng a écrit :
> Looks good, but now a bigger problem came up.
> 
> My aim is to correct the fish eye distortion for pix_movement and
> pix_multiblob analyses.
> Which means first I have to make the curve3d correction and then use
> those pixels in pix_multiblob.
> Is it possible?
> 
> On Wed, Jul 17, 2019 at 8:16 PM Johnny Mauser
> mailto:joson.andr...@googlemail.com>> wrote:
> 
> Maybe gems [curve3d]? 
> 
> Csaba Láng mailto:langcs...@gmail.com>>
> schrieb am Mi., 17. Juli 2019, 20:10:
> 
> Hi list,
> is there an easy way to correct fish eye camera image distortion?
> I think if a vortex kind of tool.
> Best,
> Popesz
> ___
> Pd-list@lists.iem.at  mailing list
> UNSUBSCRIBE and account-management ->
> https://lists.puredata.info/listinfo/pd-list
> 
> 
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Re: [PD] fish eye camera distortion correction

[Johnny Mauser via Pd-list]

You can use [pix_snap] after [curve3d] to convert the texture to a pix
again.

Csaba Láng  schrieb am Mi., 17. Juli 2019, 20:37:

> Looks good, but now a bigger problem came up.
>
> My aim is to correct the fish eye distortion for pix_movement and
> pix_multiblob analyses.
> Which means first I have to make the curve3d correction and then use those
> pixels in pix_multiblob.
> Is it possible?
>
> On Wed, Jul 17, 2019 at 8:16 PM Johnny Mauser <
> joson.andr...@googlemail.com> wrote:
>
>> Maybe gems [curve3d]?
>>
>> Csaba Láng  schrieb am Mi., 17. Juli 2019, 20:10:
>>
>>> Hi list,
>>> is there an easy way to correct fish eye camera image distortion?
>>> I think if a vortex kind of tool.
>>> Best,
>>> Popesz
>>> ___
>>> Pd-list@lists.iem.at mailing list
>>> UNSUBSCRIBE and account-management ->
>>> https://lists.puredata.info/listinfo/pd-list
>>>
>> ___
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Re: [PD] fish eye camera distortion correction

[Csaba Láng]

Looks good, but now a bigger problem came up.

My aim is to correct the fish eye distortion for pix_movement and
pix_multiblob analyses.
Which means first I have to make the curve3d correction and then use those
pixels in pix_multiblob.
Is it possible?

On Wed, Jul 17, 2019 at 8:16 PM Johnny Mauser 
wrote:

> Maybe gems [curve3d]?
>
> Csaba Láng  schrieb am Mi., 17. Juli 2019, 20:10:
>
>> Hi list,
>> is there an easy way to correct fish eye camera image distortion?
>> I think if a vortex kind of tool.
>> Best,
>> Popesz
>> ___
>> Pd-list@lists.iem.at mailing list
>> UNSUBSCRIBE and account-management ->
>> https://lists.puredata.info/listinfo/pd-list
>>
>
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Re: [PD] fish eye camera distortion correction

[Johnny Mauser via Pd-list]

Maybe gems [curve3d]?

Csaba Láng  schrieb am Mi., 17. Juli 2019, 20:10:

> Hi list,
> is there an easy way to correct fish eye camera image distortion?
> I think if a vortex kind of tool.
> Best,
> Popesz
> ___
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> UNSUBSCRIBE and account-management ->
> https://lists.puredata.info/listinfo/pd-list
>
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[PD] fish eye camera distortion correction

[Csaba Láng]

Hi list,
is there an easy way to correct fish eye camera image distortion?
I think if a vortex kind of tool.
Best,
Popesz
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