Hello Luca,
did you take account of needing the same FOV in all three systems
(webacm, QuartzComposer output window, projector) you are trying to
match?
Achim Breidenbach
Boinx Software
On 05.04.2010, at 03:06, arri wrote:
hey luca,
not sure if this is at all relevant to your project, or maybe i'm not
adding anything to the discussion because it's nothing new to you, but
for a project with (slightly) similair demands, i remember the magic
words were "structured light".
google for that and you find a wealth of information.
we ended up implementing a fully automated system;
just drop the projectors and camera's loosely in place, hook them up,
and press play: the system figures-out geometries and distances by
itsself.
\rri
On Tue, Mar 30, 2010 at 12:30 PM, Stefan Kainbacher, NEON GOLDEN
<[email protected]> wrote:
we implemented the paper on quartz composer.
first we wrote a applicaton with objective-c/open gl to do the
calibration
and then we implemented it in qc with glsl
http://www.facebook.com/video/video.php?v=1387742499852
the model and the 3d model have to mach as exact as possible
the higher the resolution the better the result
its also depending on the angle of the projecter / object ... the
more depth
you have, the better it works ...
we just opend our first installation based on it, using a matrox
tripplehead
and 3 projectors ...
http://www.facebook.com/album.php?aid=196408&id=66111817237
best, stefan
On Mar 29, 2010, at 4:28 PM, luca palmili wrote:
Hi guys,
I'm trying to find a solution to match a projector output with a
real 3D
object. I know that it is possible (look at this article for example
http://www.merl.com/papers/docs/TR2001-21.pdf), but I'd like to do
it in QC.
You can also read this interesting solution using
http://vvvv.org/tiki-index.php?page=How+To+Project+On+3D+Geometry
I think the best solution is to write a custom patch using OpenGL and
OpenCV. My current approach is this:
I write a stand-alone application using OpenGL and OpenCV. It
implements the
POSIT algorithm (http://opencv.willowgarage.com/wiki/Posit) using
webcam
input, and tries to match a projection of a 3D cube with a real one.
The POSIT algorithm (cvPOSIT function of the OpenCV library) takes
in input
the focal lenght of the webcam, 3D object-coords of 4 non-co-planar
point of
a cube, and their correspondent 2D coordinates in the webcam input
(there is
a real cube in the scene), which is positioned over the projector
(so as to
capture the same scene from the same point of view).
The POSIT algorithm outputs the opengl model-view (rotation,
translation),
and projection matrix.
Then I write a custom GLSL shader in QC which use the same matix
for the
projection of a cube.
The result is not so perfect, but the cube is projected nearly in
the right
place.
Is there someone how tried to do something similar? How can I
improve my
workflow, so as to perfectly match the projected image with the
real 3D
object? Are there in your opinion any additional step to take into
account?
Thank you!
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