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A new pointing method for an electronic presentation system is described, which can detect a position on a screen at which a human presenter points on the screen directly by using special pointing bar.
English (United States)
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Pointing Method for Electronic Presentation System
A new pointing method for an electronic presentation system is described,
which can detect a position on a screen at which a human presenter points on
the screen directly by using special pointing bar.
This pointing method consists of the following two steps. (1) display areas on
the screen, and modulate their intensity in time or space (2) detect one of the
areas by using an optical detector which is mounted at the tip of the pointing bar.
Fig. 1 shows one example of this method, in which areas for '', '' and ''
are blinking in different duration and/or cycle and/or
phase by the system. The system can identify the pointed area by detecting its
blinking pattern, when it is pointed by the pointer bar 1 with optical detector 2.
Fig. 2 shows another example to feature areas to be pointed by vertical
and/or horizontal scan lines on the screen. The system displays a horizontal line
and moves it from top to bottom on the screen, for example, and displays a
vertical line and moves it from left to right, and repeats this. The system can
determine the position of the tip of the pointing bar, by detecting shadows of scan
The scan lines should have different color(s) on a color screen, or they
should be drawn in Exclusive-OR (XOR) mode on a monochrome screen, to
discriminate from other information on the screen.
Fig. 3 shows another example with a bar-code technique, in which bar codes