Re: [PD] fish eye camera distortion correction

[Py Fave]

look for the rendering order options ,

its in gemhead arguments .

there is an example in docs/advanced/14.RenderOrder.pd
and in gemhead help

py

Le mar. 23 juil. 2019 à 13:34, Csaba Láng  a écrit :

> I am getting closer to the solution, however have a bigger problem than
> expected.
> As the camera is pointing at the projection surface, I have the classical
> video feedback effect. As a result, the corrected image is getting bigger
> and bigger, and I loose more of the image,
> than the fish eye correction was made with the [curve3d].
> how could I move the image after gemframebuffer and move back with the
> offset of the pix_snap?
> Or what for the offset is made?
> Is there any method to avoid the video feedback in pix_buffer?
> Looking forward to any brilliant idea :)
>
> Popesz
>
> On Wed, Jul 17, 2019 at 10:00 PM Christof Ressi 
> wrote:
>
>> 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
>>> > 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 <mailto: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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>>
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Re: [PD] fish eye camera distortion correction

[Csaba Láng]

I am getting closer to the solution, however have a bigger problem than
expected.
As the camera is pointing at the projection surface, I have the classical
video feedback effect. As a result, the corrected image is getting bigger
and bigger, and I loose more of the image,
than the fish eye correction was made with the [curve3d].
how could I move the image after gemframebuffer and move back with the
offset of the pix_snap?
Or what for the offset is made?
Is there any method to avoid the video feedback in pix_buffer?
Looking forward to any brilliant idea :)

Popesz

On Wed, Jul 17, 2019 at 10:00 PM Christof Ressi 
wrote:

> 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
>> > 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 <mailto: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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>> UNSUBSCRIBE and account-management ->
>> https://lists.puredata.info/listinfo/pd-list
>
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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 <j...@rybn.org> 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
> <joson.andr...@googlemail.com joson.andr...@googlemail.com>> wrote:
>
>     Maybe gems [curve3d]? 
>
>     Csaba Láng <langcs...@gmail.com 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 Pd-list@lists.iem.at> mailing list
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>
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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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> 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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