Gesture Controlled Desktop Using Webcam

Topics: User, Computer, Multi-touch Pages: 7 (2068 words) Published: March 9, 2011
Chapter I
In the "real" world, a gesture is a motion of the limbs or an act made to express a thought or as a symbol of intent. You gesture to your waiter to come over and see the fly in your soup, or wave an oncoming car past your stopped car. You make hand gestures to express disgust and anger of others, or to signal approval and disapproval (thumbs up and thumbs down). These gestures are often shortcuts or silent, non-verbal alternatives for expression. In other cases, especially when we want a richer vocabulary, we may use spoken or written language to express ourselves more explicitly. These gestures and their meaning are usually learned. While they may have a relationship to the idea being expressed (waving a car around your stopped car), they often have more obscure symbolism and take longer to learn (handshaking, giving a "high-five). In the realm of computing, we have other gestures. When using a mouse, we indicate position on the computer screen by sliding our hands over the desk in a relative (not absolute-positioned) motion. We use finger gestures, including some we call "pushing buttons", that are really more akin to the dexterity of playing a note on the clarinet than on a piano or pushing a button to choose something from a vending machine. The same gesture can have different meanings when we press a second button on the mouse or use our other hand to hold down a modifier key on the keyboard. Once you learn a gesture and its meaning, it becomes a "natural" way of expression. In your mind, you start thinking of waving a car around yours or stopping one approaching a crosswalk by using an upraised hand as directly "controlling" something else. You start to think of the gesture like a lever that is mechanically effecting what you want, and may think that is the only gesture that could have that meaning, just as in the physical world only that particular lever could actually control the thing to which it was connected.

Background of Study
The term gesture recognition was generally used to refer specifically to handwriting gestures, such as inking on a graphic tablet or mouse gesture recognition. This is computer interaction through the drawing of symbols with a pointing device cursor. Strictly speaking the term mouse strokes could be used instead of mouse gestures since this implies written communication, making a mark to represent a symbol. The first mouse gesture, the "drag," was introduced by Apple to replace a dedicated "move" button on mice shipped with its Macintosh and Lisa computers. Dragging involves holding down a mouse button while moving the mouse; the software interprets this as an action distinct from separate clicking and moving behaviors. Although this behavior has been adopted in a huge variety of software packages, few other gestures have been as successful.

Three key patents protect the camera-enabled gesture-recognition technology invented by GestureTek. The first patent (applied for in 1990 and received in 1996) set the industry standard for computer vision control. Current U.S. patents include 5,534,917 (video image based control system), 7,058,204 (multiple camera control system) and 7,227,526 (3D-vision image control system).  Multiple international patents have also been allowed and a further 37 patent applications are in various stages of the patent process.

The study applies a new way to interact with sources of information using an interactive display. For a long time the mouse and keyboard has been use to control a graphical display. With the advent of increased processing power and technology , there has been a great interest in academic and commercial sector in developing new and innovative camera gesture.

As of 2005[update], most programs do not support gestures other than the drag operation. Each program that recognizes mouse gestures does so in its own way, sometimes allowing for very short mouse movement distances to be recognized as...
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