Hi all, I'm working on quite the same things, didn't realize to any good result actually but on the good way I think. Luca, did you find one solution with the Posit algorithm? For me it missed one thing in your approach, is how do you determined the fov and intrinsec parameters of your projector/camera. Did I missed something in your approach? Stefan, what approach did you use to calibrate? I'm actually looking at opencv camera calibration algorithm, but have some difficulty to understand the approach, and how to adapt it from one multiple pattern on one plane calibration to a 4 non coplanar points calibration. Thanks for helps, Thomas.
On Tue, Apr 6, 2010 at 7:24 PM, Stefan Kainbacher, Neon Golden < [email protected]> wrote: > > Am 06.04.2010 um 12:16 schrieb Stefan Kainbacher, Neon Golden: > > hello again and sorry for the delay. > > basically the system works fine, but there are some things to consider. ie. > how much of the object you get. depth etc. at least with our calibration > tool. (steps 1-3) and then we also load the matrices from xml an project it > onto the scene. > > i cant tell you to much about your questions, as you are using a camera > calibration, but so far i understand the problems (with our object). the > front projector, covering the whole frontside und captering the depth of the > object works really good. the other projectors which are positioned closer > to the object and covering a smaller area of the object are not thet good. > also its a matter of resolution. 1 pixel in the calibration makes already a > big difference for the calculation ... > > best, stefan > > > Am 30.03.2010 um 14:41 schrieb luca palmili: > > Hi Stefan, > thank you for your reply. Your project is very impressive, good luck for > your installations! :) > > My approach is this: > > 1. My application take the camera input using OpenCV at a resolution > WxH, and put it as a background texture in an OpenGL window. > 2. I click on the OpenGL window on 4 non co-planar points of the cube > in the scene. > 3. I use cvPOSIT function to get translation, rotation and projection > OpenGL matrix. > 4. I hard-code this matrices in a GLSL patch in QC, witch render a cube > into a viewer of WxH resolution. > 5. The viewer output is then projected by a projector (with resolution > WxH) onto the real scene. > > The result is quite good, but there are some errors: the two cubes doesn't > match exactly. > > - My camera is positioned over the projector, so extrinsic parameters > are referred to the camera point of view. Even if camera and projector > lenses are near, how can the camera extrinsic parameter work well also for > the projector ones? > - How did you find camera estrinsic parameters? Did you use POSIT > algorithm and OpenCV cameraCalibration methods? > > Thank you for any kind of help! > Luke > > > > 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 >> > > > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Quartzcomposer-dev mailing list ([email protected]) > Help/Unsubscribe/Update your Subscription: > > http://lists.apple.com/mailman/options/quartzcomposer-dev/thomas.pachoud%40gmail.com > > This email sent to [email protected] > -- Thomas Pachoud ingénieur multimédia IMAC www.creapach.fr
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