Precursor By A.S.Krishna

Introduction• Pre-Cursor' is an invisible interaction of

pointer.

• An invisible layer that hovers just in front of the computer screen, extending the capabilities of current touch screen displays.

• When using a computer mouse, there are three levels of depth.

• They are the ability to hover, a low-commitment action that gives short feedback; mice also allow click, a medium-level of commitment that selects or highlights, moving components from passive to active states; and finally, a double click provides the highest level of commitment, allowing users to delve into a folder or open an application.

• Present touch screen displays, on the other hand, lack this hierarchical structure of interactions and is limited to one level of depth: a simple click.

• Pre-Cursor provides this missing sense of interaction to touchscreens.

• Pre-Cursor technology has the potential to expand beyond a basic computer screen.

Hardware Implementation

• At the base of the computer screen, there is an infrared laser, fitted with a line cap, that shines upward, creating an invisible light plane that hovers parallel to and just in front of the computer screen.

Software Mapping Algorithm• Pre-Cursor is an extension of the

Mouseless project (top) and it uses the same technology. When the user’s finger interrupts the invisible light plane created by the IR laser, the infrared light illuminates the finger from the bottom, creating a bright blob that the two cameras can interpret. The algorithm used in Pre-Cursor draws from topics in geometry (namely, triangulation and epipolar geometry) to compute the position of the finger.

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