mga/blog

–Texto en inglés como parte de mi estudio en Carnegie Mellon University. Eventualmente haré una versión en español.–

2D <3 3D is a Kinect-based online multiuser interactive environment. The project is still under development and currently allows multiple web-based users to interact with and augment the physical space of the Kinect participants with virtual objects.

Background

3D is the talk of the hour. From cinema to the living room, 3D is becoming simultaneously a selling and a divisive point. The point of this project is to mesh both points of view and make a commentary about the banality of this “issue”. The project is inspired by many previous works including:

The Bauhaus school of art, architecture and design also explored theatre. I was mostly interested in its highly geometric and formal qualities.

Peter Gabriel’s Sledgehammer video demonstrated an interesting optical phenomenon: human shapes may be inferred by the sole movement of points.

UYUYUY is a short film by Santiago Caicedo which, while designed to be watched with 3D glasses, is mostly composed of 2D elements.

The web has always been a medium of my interest. I try to include web-related functionality in my projects. The Red Agency website has an interesting chat functionality mixed with navigation and 2D parallax scrolling interface.

Technical exploration

I wanted to have a multiuser conversation between the physical and the virtual; 3D and 2D. This was my first C++ project so the learning curve was quite steep and full of obstacles. I started exploring the networking possibilities in openFrameworks including ofxOsc and ofxNetwork deciding upon the latter communicating with the web via a Java-based XMLSocket server (I know “basic” web sockets perform better but not enough time to explore that).

The project also uses ofxOpenNI for skeleton detection and ofxBox2d for physics/collision detection. An initial attempt was made to use ofxMSAPhysics but for some reason I could not make it work well with ofxOpenNI. The web interface uses Flash.

One challenge was how to visualize and represent the activity in either end (Flash being the 2D environment and openFrameworks the 3D). Further exploration must be made in order to have a more interesting visual representation in both ends.

Interdependence

The two main components of this project are mutually dependent: the 3D-interacting users require that web users are present and creating objects they can interact with. 2D web users require the “presence” of 3D skeletons for them to observe and affect. This “conversation” between 2D and 3D is the main element of the project.

Download the code (ZIP 20 MB) which is completely unsupported. Contains:

• Flash CS5 .FLA file (for the web-based interface)
• Eclipse Java project folder (for the socket server)
• openFrameworks project folder

Presentation (PDF 471 KB)

This project was done as part of the requirements to complete the Spring 2011 Interactive Art and Computational Design course with Professor Golan Levin in Carnegie Mellon University.

–Texto en inglés como parte de mi estudio en Carnegie Mellon University. Eventualmente haré una versión en español.–

New Faces is a project that began in 2009 after I got fed up with Colombia’s online newspapers’ (one site, another site) high emphasis in sports and celebtrity-related news. I decided to take a screenshot of the offending website and remove this information (along with advertising) in order to see what was left.

Clearly sports, advertising and celebrity news have a relatively high importance for this colombian newspaper (at least in its online incarnation). This led me to wonder if this was the same across different countries. I decided to create a Python script that makes use of webkit2png-0.5 to take a screenshot of eleven news websites every night at 8pm. This script has been ran almost every night since November 8, 2009.

New faces

After seeing Rutherford Chang’s work with the New York Times where he blacks-out every element in the page except faces (no link available, sorry) I thought it would be an interesting idea to execute this same process in my dataset of more than 3,000 files and 10 GB.

I tested various technical solution for this process and decided upon using the OpenCV library for Processing.

After that it was a matter of applying it to my dataset and see if it worked. I tried several parameters for the detect() method since there were many false positives (text selected as face) and false negatives (face undetected when there should be) but could not get 100% accuracy. These errors provide an interesting outcome anyway.

The faces are extracted from the screenshots and saved as separate files along with their original location in x,y and number of total faces in the screenshot. There were 28,000+ faces deteced (less than 10 faces per screenshot).

With this new subset I then created a Flash interface to view the faces in their original x,y coordinates with buttons to toggle the visibility of individual news sites. Next to the buttons a blue line indicates average face area, a green line indicates how many screenshots (individual days captured) and a red line indicates total amount of faces in that site.

View the Flash interface online in your browser. F for fullscreen (click the interface to give it focus). CAUTION: ~30,000 images files loaded might clog up your browser (although they’re about 2kb each only). Interface is not optimized for low-end computers.

Future work

From this initial work some superficial conclusions could be made (see photo captions). Further analysis could provide some interesting information such as:

• dominant race or skin color
• gender distribution
• dominant face expression (sad, happy, angry, etc.)
• average face area
• preferred location in the page
• how the above change over time

The interface makes use of Bit-101?s Minimal Comps.

This project was done as part of the requirements to complete the Spring 2011 Interactive Art and Computational Design course with Professor Golan Levin in Carnegie Mellon University.

¿Le gustan las caras?

No. No se trata de la banda de Rod Stewart y Ron Wood. Es un nuevo proyecto que hice y del cual escribí un breve post en este otro blog. Si quiere saber qué tienen en común Python, Processing, OpenCV y Flash, debería darle una leída y jugar con la interfaz.

I was invited by my colleagues Hernando Barragán and Annelie Franke to collaborate with the Thought Factory, a project that started in their Design Studio 6 course for the second semester 2009. The project was commisioned by the XII Iberoamerican Theatre Festival in Bogotá, one of the most important festivals of its type in the world. The idea was to create a collaborative work that would allow people to interact with the festival.

With this in mind, the Thought Factory was created and its main purpose was to save and classify the thoughts of festival visitors. Thoughts are abstract and intangible notions (we can’t read minds… yet). The Factory was made to make those thoughts somewhat tangible, “saving” them in bottles that can later be opened and their contents made visible as the genius in the lamp.

Each bottle represents an inquiry made by festival organizers. Every hour and a half a new bottle is placed in the filling station:

A bottle being filled

From that moment, and during the next ninety minutes, that bottle will be filled with thoughts from people who type them in the input stations:

Thought input machine

Thoughts can also be sent as an SMS message via mobile phone.

Since the Festival as for all ages it was necessary to curate these thoughts (basically removing obscene ones… let’s be honest, there’s plenty of obscenities in our thoughts :P).

Curating machine

Once approved, the message enters the bottle in the filling station:

When removed from the filling station, the bottle is labelled and placed with the rest of the full bottles so its thoughts can be read in the viewing station.

At the end of the Festival (in april 4, 2010) there will be sixty bottles full of thoughts that can be read in the project website.

My main tasks were developing the visual interfaces (thought input, thought curating, filling station, bottle visualization), the database that manages thoughts and inquiries and all communication happening between these and the bottles. SMS message service was kindly provided by Contacto SMS.

If you are curious about the tech side of the project: interfaces are made with Adobe Flash which communicate with a MySQL database via PHP and AMFPHP. Filling and viewing stations communicate with the bottles via Wiring using sockets and an RFID tag. ActionScript programming was made in FDT.

Fui invitado por mis colegas Hernando Barragán y Annelie Franke a participar en la Fábrica de Pensamientos, un proyecto que se deprendió de su curso Estudio 6 del segundo semestre de 2009. El proyecto fue comisionado por el XII Festival Iberoamericano de Teatro de Bogotá, uno de los festivales de este tipo más importantes del mundo. La idea era hacer una obra colaborativa que permitiera a la gente interactuar con el festival.

A partir de esa premisa, se realizó la Fábrica de Pensamientos cuya idea principal es guardar y clasificar los pensamientos de los visitantes al festival. Los pensamientos son nociones abstractas e intangibles (aún no podemos leer la mente). Con la Fábrica se busca hacer esos pensamientos tangibles de alguna forma, “guardándolos” en botellas que luego pueden ser abiertas y su contenido se hace visible como el genio de la lámpara.

Cada botella representa una inquietud planteada por el festival. Cada hora y media se pone una nueva botella en la base de llenado:

Una botella en proceso de ser llenada

A partir de ese momento, y durante los siguientes noventa minutos, se llenará esa botella con los pensamientos que la gente escribe en las máquinas de entrada:

Máquina de entrada de pensamiento

Pensamientos también pueden entrar en la botella vía mensaje de texto de teléfono celular.

Dado que el Festival es un evento para toda la familia es necesario hacer una curaduría de los pensamientos (básicamente prevenir el ingreso de obscenidades… seamos honestos, hay mucho pensamiento obsceno sucediendo en nuestras cabezas :P ).

Máquina de curaduría

Una vez aprobado, el mensaje entra a la botella que se encuentra en la base de llenado:

Cuando se retira la botella de la base, se etiqueta y se guarda para luego ser consultada por los visitantes en cualquier momento en la estación de visualización.

Al finalizar el Festival en abril 4 de 2010 habrá sesenta botellas llenas de pensamientos que podrán ser visualizadas en el sitio web del proyecto.

Mi labor principal fue desarrollar la parte visual (interfaz de entrada de pensamientos, interfaz de moderación, interfaz de llenado, interfaz de visualización, sitio web), la base de datos que soporta el sistema de pensamientos e inquietudes y toda la comunicación que sucede entre estas y las botellas. El sistema de mensajes de texto fue amablemente provisto por Contacto SMS.

Si tiene curiosidad de saber qué tecnologías están involucradas: las interfases están hechas en Adobe Flash y se comunican con la base de datos MySQL usando PHP y AMFPHP. Las interfases de llenado y visualización de botellas se comunican vía sockets con Wiring usando un tag RFID.