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Method and Apparatus for Performing Pointing Device Movements from Physical Object Placement on a Projected Image

IP.com Disclosure Number: IPCOM000023303D
Original Publication Date: 2004-Mar-29
Included in the Prior Art Database: 2004-Mar-29
Document File: 3 page(s) / 68K

Publishing Venue

IBM

Abstract

Image projectors find common use in situations where a presenter projects a computer screen onto a large surface. When the presenter wishes to demonstrate something interactively, he must break the natural flow of the presentation by turning his attention to the computer and using the pointing device on the computer to navigate the application on the screen. Devices such as a wireless mouse or a laser pointer help aid the presenter in focusing attention on the projected image, but the laser pointer does not move the mouse, and the wireless mouse is cumbersome to use. The solution herein described allows a presenter to interact with the projected image while maintaining focus on that image. Position recognition technology on a two-dimensional surface is utilized, effectively allowing the presenter to act as a human mouse. The presenter approaches the projected image and presses his finger onto the image at the point where he wants the mouse to move, and sensors surrounding the projection surface detect his finger's position, moving the cursor and window focus accordingly.

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Method and Apparatus for Performing Pointing Device Movements from Physical Object Placement on a Projected Image

Image projectors find common use in situations where a presenter projects a computer screen onto a large surface. When the presenter wishes to demonstrate something interactively, he must break the natural flow of the presentation by turning his attention to the computer and using the pointing device on the computer to navigate the application on the screen.

Devices such as a wireless mouse or a laser pointer help aid the presenter in focusing attention on the projected image, but the laser pointer does not move the mouse, and the wireless mouse is cumbersome to use.

The solution herein described allows a presenter to interact with the projected image while maintaining focus on that image. Position recognition technology on a two-dimensional surface is utilized, effectively allowing the presenter to act as a human mouse. The presenter approaches the projected image and presses his finger onto the image at the point where he wants the mouse to move, and sensors surrounding the projection surface detect his finger's position, moving the cursor and window focus accordingly.

Many methods exist whereby the position of a physical object on a two-dimensional plane may be determined. These methods include (but are not limited to) sonar, image recognition, pressure-sensitive surfaces, and electromagnetic signals. This invention employs a method for determining the position of a small object (like the presenter's finger) that is adjacent to the projection surface.

Software on the computer controls the mouse pointer in accordance with readings from the sensors mounted on, in, or around the projection screen. The sensors transmit signals that correspond with the presenter's pointing device (be it his finger or another object) to the laptop. This transmission may occur over a physical link, like USB, RS232, or Firewire, or it may occur over a wireless link, like Bluetooth or 802.11.

Physical locations indicated by the sensors must be converted into X/Y coordinates on the computer screen. The mapping of the physical coordinates onto the screen coordinates can be calibrated by presenting the user with dots at which to point. For example, the calibration utility places a dot at the upper-left-hand corner of the screen. The...