benoît lahoz

I’ll be there, part of the delegation of the OFQJ (Office Franco-Québécois pour la Jeunesse), 1-5 -> 12-5. If you’re around…

Finally, I implemented the cvblob library in our Quartz Composer OpenCV plugin. It is available from the box. As usual, the accuracy of the tracking will depend of the quality of your image, but I externalized a lot of parameters so it can be adjusted easily, with an option to output the intermediate image.

The plugin output an image and a structure of labeled blobs. For performance you might prefer not outputting the image and use the structure for your needs.

I began an ObjectiveC wrapping of the OpenCV functions I am using. It’s becoming easier to build new plugins and there’s an image output now (only on the Blob Tracking one, because I have to adapt the old ones with my new CVImage class).

The cvblob library is available here. Thanks so much to the developper !

Others OpenCV plugins are coming, specially the Delaunay one, but there is still a lot of bugs.

Please make a citation to L’ange Carasuelo if you’re using this plugin… and an email would be highly appreciated to see what you’re doing. I’m always interested !

Draft version of a clock made with Kineme 2D plugin. From the center : hours, minutes and seconds.
The “clock” is passed in the Delaunay plugin to make it Box2D-able. Then the “Place” patch from the Box2D plugin is used for the white balls.

Finally !
Very buggy and leaky though… To be continued…

Our free adaptation of Haruki Murakam’s novels.
Images and text are from the 2011 work in progress. The final show will be created in February 2012. Here you have the… spirit of the “thing”.

First time I play, make the stage direction, the images at the same time… This show is born of a project we had until November 2011 with the CNRS (French National Research Center), which name was “Toute la lumière sur l’ombre” (TLLSLO tag on this blog).

Artists are searchers…

… even if we are not necesarily developers

—-

Trailer de “Un petit à-côté du monde”, théâtre et numérique intermedia, adapté des oeuvres de l’auteur japonais Haruki MURAKAMI.

Musique : Michel Thouseau
Musique additionnelle pour la vidéo : Guillaume Gargaud
Images : Benoît Lahoz

Captation :
Le Cube 2011 – Marc Ribaudo – 2011 Pixaway Production – pixaway.com
Dominique Chauvin – dchauvin.fr
Post-production & montage : Benoît Lahoz

VERSION FINALE DU SPECTACLE : février 2012, en résidence à Taverny, France.
L’ange Carasuelo 2011 – carasuelo.org

Well… the way is always better than the goal.

Pursuing my Box2D mixed reality goal I have to learn a lot about everything, and particularly about OpenCV. Sincerely… I love it !

The fact is that the OpenCV Delaunay is good and fast, but it seems it’ll be a hard way before I can manage with constrained Delaunay, with OpenCV only. So I decided to implement the poly2tri library in my plugin. Great and fast lib ! I swear !

I have now the constrained Delaunay at about 40fps. For the moment the plugin isn’t available, but sure it will.

Known bugs :
- Crashes when [???] -> seems that it doesn’t like when there are too much contours, or when too much contours are on the edge…

You can download the Contour / Convex Hull one in the Box. It contains a Presence plugin that works quite well, and that we’re using on our “Mémoire(s)Ombres” installation.

Opening on the 5th of November 6pm at Taverny, France.
5th-30th November 2011.

Can’t manage to find where the OpenCV license would forbid to share this. Please tell me if I’m wrong.

Download from the Box…

I was looking for a way to get the contours of a shadow obtained via infrared (or a finger blob for example).

So I came to OpenCV and made this plugin you can download from the Box. This is a first step ! A next step could be tracking and Delaunay constrained triangulation.
Then I’ll implement it in the Box2D Quartz Composer plugin I’ve been working on for a while.

You’ll need the KinemeGL plugin if you want to render the lines structure output by the plugin : http://kineme.net/release/GLTools/16

Known issues :
- Doesn’t take any still pictures as input. You’ll have to put it in a Render In Image.

Please download !

I needed a physics and collisions simulation, to obtain a more flexible interaction between the performer and the virtual world on the screen. So I went into programming a plugin for Quartz Composer that would keep the flexibility of the tool, in a “Kineme-like” way (one box = one function).

Other (better) images will come soon.