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 christof.ressi@gmx.at 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-b...
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" langcsaba@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 jack@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.android@googlemail.com mailto:joson.android@googlemail.com>
wrote:
Maybe gems [curve3d]? Csaba Láng <langcsaba@gmail.com <mailto:langcsaba@gmail.com>> schrieb am Mi., 17. Juli 2019, 20:10: Hi list, is there an easy way to correct fish eye camera imagedistortion?
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
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