Browse Prior Art Database

Pointing Method for Electronic Presentation Systems

IP.com Disclosure Number: IPCOM000102490D
Original Publication Date: 1990-Nov-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 3 page(s) / 81K

Publishing Venue

IBM

Related People

Matsushita, T: AUTHOR [+2]

Abstract

Disclosed is a new pointing method for electronic presentation systems which can detect an object on a screen when a human presenter points to the object directly with a special pointing bar, as shown in Fig. 1.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 72% of the total text.

Pointing Method for Electronic Presentation Systems

       Disclosed is a new pointing method for electronic
presentation systems which can detect an object on a screen when a
human presenter points to the object directly with a special pointing
bar, as shown in Fig. 1.

      This pointing method consists of the following steps:
(1)  Display objects on the screen, and modulate their intensity by
using error-detectable coding.
(2)  Detect the blinking of an object by using an optical sensor, and
check for detection errors.
(3)  If an error is found, then re-try step (2); otherwise, identify
the object.

      Figs. 2, 3, and 4 show three examples of error-detectable
coding.

      Fig. 2 shows a sequential blinking coding for three objects.
This method is to detect an object by the following steps:
 (1) Blink each object in sequence.
 (2) If the blinking of one of the objects is detected, blink the
object several times for confirmation.
 (3) If a confirmation blink is not detected, then return to step
(1).

      Fig. 2 shows the light intensity of three objects and a signal
from the optical sensor, in time sequence. In this example, some
noise that occurs when object 2 is blinking is rejected, and object 3
is selected after blinking twice for confirmation.

      Fig. 3 shows an error-detectable coding using a parity bit.
This method is to detect an object by the following steps:
 (1) Repeat start bits until an object is detected.
 (2) Blin...