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" <langcs...@gmail.com>
An: pd-list@lists.iem.at
Betreff: Re: [PD] fish eye camera distortion correction
Von: "Csaba Láng" <langcs...@gmail.com>
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 <mailto:joson.andr...@googlemail.com>> wrote:
>
> Maybe gems [curve3d]?
>
> Csaba Láng <langcs...@gmail.com <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
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