Vision based techniques

This technique allows for the detection of hand movements and thus recognising gestures acquied by a camera system with the aid of appropriate image processing software.

Microsoft's kinnect is the most widely available cost effective technology which includes a quarter video graphics array infrared camera and a video graphics array camera(VGA-RGB) both with the frame rate of 30fps.

It had an infrared light emitter that projects nonuniformly distributed dots on the screen detected by the depth infrared sensor.This allows the user to create a depth map of the observed scene.

The image processing software provides identification of the number, position and skeletal joints of the subject inside the scene.

It detects upto a distance of 4 meters

Disadvantages of using Camera

1. Camera enclosure

2. Resource management difficulty

3. Costly Computing

4. High energy consumption