Browse Prior Art Database

Electronic Presentation System

IP.com Disclosure Number: IPCOM000121097D
Original Publication Date: 1991-Jul-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 2 page(s) / 143K

Publishing Venue

IBM

Related People

Shrestha, VP: AUTHOR [+2]

Abstract

This technique is to provide direct manipulation method to a speaker who uses an electronic presentation system. The electronic presentation system has: (1) a display unit controlled by a PC, (2) a pointing bar with three-dimensional (3D) position sensor, and (3) PC controls above. The figure shows an example of the system.

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Electronic Presentation System

      This technique is to provide direct manipulation method
to a speaker who uses an electronic presentation system.  The
electronic presentation system has:
(1) a display unit controlled by a PC,
(2) a pointing bar with three-dimensional (3D) position sensor, and
(3) PC controls above.
The figure shows an example of the system.

      This method is to:
 (1) calculate the position of the pointing bar's shadow, and
 (2) provide direct manipulations by using the position.

      The direct manipulations provided can be any of what is
provided in conventional desktop computing environments, such as
objects dragging, button operation, scroll bar, and menu selection.

      The position of the shadow of the pointer (X,Y) can be
calculated when the 3D position of the pointer is (x,y,z), as
follows:
  X = x * L /  ( L - z ),
  Y = y * L /  ( L - z ),
where we take the z-axis as the light axis of the projector, and
origin on the screen.

      Although we assume the light axis is perpendicular to the
screen, we can calculate the shadow when it is not.

      This method is a natural enhancement to conventional 2D
detection on the projection screen and has a merit that a speaker can
point when the screen is too large to touch it with a pointer.