Touchscreen Technology - III

Enhanced dining experience at restaurant

Concierge service at hotels

Concept mapping

Use as interactive Whiteboards

Better multi-media experience

One of the greatest examples of it is the Microsoft Surface.

1) Screen

2) Infrared Cameras

3) CPU

                 

 4) Projector   
 


     

                        

Utilizes Frustrated Total Internal Reflection

The surface of the table is a thin diffuser, which has infrared light and a projector reflected on its underside.

Infrared cameras pick up on any objects such as fingers, paintbrushes over the surface, when touching the display.

Light encounters an interface (boundary) with lower index of refraction, light becomes refracted (bent).

Refraction depends on the angle of incidence

After a certain angle it undergoes TIR

A finger, with a lower index of refraction, when it comes in contact with that surface can cause the light to escape

Infrared camera captures image on the screen

The image processing subtracts background image to reduce noise

It uses a Gaussian smoothing filter to reduce noise

Introduced a cutoff filter to make the image black and white

Grouped the white pixels together

Then the program finds the center and relative size of the pixel groups to drive the applications.

   

Army marking a particular area

And, a person reporting the crime rate of a state, Georgia













Now all that were some still pictures you saw now view them in the form of video's.

1. Microsoft Surface in practice.


2. Multi-touch Wall used at CNN.

3. Multi-touch Wall.