PROPOSED SYSTEM
3.1 System Con¯guration
Fig. 1 illustrates the proposed system con¯gura-
tion. The system is composed of two USB cameras
and a display connected to the PC for the guitar play-
ers. The two USB cameras capture the left player's
¯ngers positioning and the guitar neck from two dif-
ferent positions.
The important aspect in constructing this guitar
teaching aid was developing accurate 3D positions of
the guitar and the ¯ngers. We attach a 4.5cm £ 8cm
ARTag ¯ducial marker onto the top right corner of
guitar neck and use it to compute the position of the
guitar. To make the system robust enough, we usefour color markers to calculate the pose of the ¯ngers
which are attached to the four ¯ngertips: fore¯nger,
middle ¯nger, ring ¯nger and little ¯nger. Utilizing
this method, we can implement a practical system
for recognizing the guitar chords with just two USB
cameras.