Sir
i need the base paper of skinput technology....

Skin-put is an input technology that uses bio acoustic sensors to locate finger taps on the skin. When raised with a pico-projector, the device can provide a direct manipulation, graphical user interface in the body. The technology was developed by Chris Harrison, Desney Tan and Dan Morris, in the Microsoft Research Users Computational Experiences Group. Skin-put represents a way to decouple the input of electronic devices in order to allow the devices to become smaller without simultaneously reducing the surface area on which the input can be made. While other systems, such as Sixth-sense have tried this with computer vision, Skin-put employs acoustics, which take advantage of the conductive properties of the natural sound of the human body (eg, bone conduction). This allows the body to be attached as an entry surface without the need for the skin to be invasively instrumented with sensors, tracking markers or other elements.
Microsoft has not commented on the future of the projects, other than that it is in active development. It has been reported that this may not appear on commercial devices for at least 2 years.
Skin-put has been publicly demonstrated as a bracelet, found in the biceps. This prototype contains ten small cantilevered piezoelectric elements configured to be highly resonant, sensitive to frequencies between 25 and 78 Hz. This configuration acts as a mechanical Fast Fourier transform and provides extreme suppression of out-of-band noise, allowing the system to function even while The user is on the move. From the upper arm, the sensors can locate the finger taps delivered to any part of the arm, right down to the fingertips, with an accuracy of more than 90% (up to 96% for five input locations). The classification is driven by a support vector machine using a series of time-independent acoustic characteristics that act as a fingerprint. Like voice recognition systems, the Skin-put recognition engine must be trained in the "sound" of each input location before use. After training, placements can be linked to interactive functions such as pausing / playing songs, increasing / decreasing music volume, speed dialling, and menu navigation.

With the addition of a pico-projector to the bracelet, Skin-put allows users to interact with a graphical user interface that is displayed directly on the skin. This allows for various modes of interaction, including button-based hierarchical navigation, list-based slider navigation (similar to an iPod / Smart Phone / MID), text input / number (eg numeric keypad) and games (eg Tetris, Frogger )