Interactive medium par excellence:

Multi-touch table and itsconstruction

practical coursework by David Šmehlík and Tereza Čechová

Interactive media theoryFaculty of Arts

2011

How to achieve this?

Note: Atractive girl not included.

1. How it works

We used a FTIR (Frustrated Total Internal Reflection) method, but there are other techniques as well.

2. Components we used

• webcam• floppy disk• plexiglass• ir led ribbon (strip of infrared diods)• frame• video projector• projection surface capable of back projection (certain

kinds of linen, Rosco Grey, curtain, in our case baking paper)

• and finally a computer with necessary software.

3. Webcam modification

These are little pieces of a PS3 Eye camera.

4. Plexiglass

It has to be 6 mm thick minimum.

5. Projection surface

We experimented here with different kinds of materials. In the end what worked work us was just ordinary baking paper.

6. Multi-Frame

We chose a customizable frame, originally for photographs.

6. Multi-Frame

My girl colleague was using a screwdriver and even soldering! Can you believe this?

7. Setup completion

The multi-touch panel, video projector, webcamera and my laptop in one place and connected.

8. Software

The necessary software for tracking I mentioned is called CCV (Community Core Vision). We are detecting blobs!

9. Fire

After calibration process we are trying some demos out.

Fire.swf feels like magic, doesn't it?

Complete coursework thesis with a theoretical part, weblinks and literature:

http://docs.google.com/Doc?docid=0AYIZZRjUymIdZGRwYjVnbnBfOGc0OHRxc2cy&hl=en

Contact: akuataja@gmail.com mrs.zralokk@gmail.com