Abstract
M.Ing.
This dissertation proposes a marker-free visual based interface device to be used with
menu driven systems. This system, called HandsFree, uses the Graphics Processing
Unit (GPU) together with Shader technology to perform the image processing.
HandsFree makes use of a web camera to gain user input without requiring
elementary computer skills. Background subtraction was used to extract user input
from the images. The problems usually obtained with background subtraction were
overcome by using an averaging technique. Test results proved HandsFree to be
robust against different coloured backgrounds and skin tones, different lighting
intensity and sudden change in lighting intensity.