19-07-2012, 02:32 PM
VISION BASED MAN-MACHINE INTERACTION
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Introduction
As the role of computers in our daily life increases, it is expected that many computer systems will be embedded into our environment. These systems must provide new types of human-computer-interaction with interfaces that are more natural and easy to use.
Today, the keyboard, the mouse and the remote control are used as the main interfaces for transferring information and commands tocomputerized equipment. In some applications involving three-dimensional information, such as visualization, computer games and control of robots, other interfaces based on trackballs, joysticks anddatagloves are being used.
Current State of Art
Current researches are mainly concentrated on visual hand/face gesture recognition and tracking systems. The outcome these projects are new vision-based user interfaces and new type of input and control devices.
Visual Panel
VisualPanelemploys an arbitrary quadrangle-shape panel and a tip pointer like fingertip as an intuitive input device. Taking advantage of the panel, the system can fulfill many UI tasks such as controlling a remote and large display, and simulating a physical keyboard.
Users can naturally use their fingers or other tip pointers to issue commands and type texts. The system is facilitated by accuratelyand reliably tracking the panel and the tip pointer and detecting the clicking and dragging actions.
Recognition
Chain code is the input for the recognition system.
Recognition system consists of finite state machinescorresponding to individual characters.
FSMsgenerating the minimum error identify the recognized character.
Certain characters such as Qand Gmight be confused: system also considers the beginning and end strokes.
Weighted sum of the error from a finite state machine and the beginning and end point error.