2008 Final Year Project – 1st Term Report - The Chinese University ...

2.2.2 POINTING [4]
Department of Computer Science and Engineering, CUHK
2007 – 2008 Final Year Project – 1st Term Report
Another functionality of Wii Remote is the pointing. Pointing in Wii Remote is
achieved by the Wii Remote and Wii sensor bar.
(a)
(b)
Fig 2.3 The Wii infra-red sensor bar
< (a) – the overview; (b) – when the infra-red LEDs are highlighting>
The sensor bar consists of 10 infra-red LEDs, 5 on each end. In each side, the LED
farthest away from the centre points slightly away from the centre; while the LED
closest to the centre points slightly towards the centre; the remaining LEDs just group
together and point straight forward.
Generally the sensor bar is placed at the centre, either above or below the
television. The Wii Remote includes a 1024x768 monochrome camera, with an IR-pass
filter in front of it. The camera includes a built-in processor capable of tracking up to 4
moving objects. [12] It is used to sense the infra-red emitted from each LED. It senses
the light as 2 bright dots and the distance between the Wii Remote and the sensor bar
is computed using triangulation. Thus the pointing position can then be known.
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