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Locating an object in 3D Grid

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nikhil

Jan 1, 1970
0
While brinstorming with some of my undergrad buddies, we hi upon a
project which requires tracking the motion of a hand in a 3D
environment and pass its coordinates to a computer. Now, we visualised
a metal grid or something with matrix of some kind of receivers[maybe
LDRs or RF ] .But the problem is what transmitter to use on the hand?
What comm.media[ laser,radio, sonic....] to go in for? If we use a
point transmitter, the hand may obstruct its path to the receiver. Is
there some whacky idea We have overlooked?
p.s he size of the grid is around .5 x .5 x .5 metres by
 
L

Leon Heller

Jan 1, 1970
0
nikhil said:
While brinstorming with some of my undergrad buddies, we hi upon a
project which requires tracking the motion of a hand in a 3D
environment and pass its coordinates to a computer. Now, we visualised
a metal grid or something with matrix of some kind of receivers[maybe
LDRs or RF ] .But the problem is what transmitter to use on the hand?
What comm.media[ laser,radio, sonic....] to go in for? If we use a
point transmitter, the hand may obstruct its path to the receiver. Is
there some whacky idea We have overlooked?
p.s he size of the grid is around .5 x .5 x .5 metres by

When I was working on virtual environments a few years ago we used Polhemus
and Ascension tracking systems.

Leon
 
D

Dan Mills

Jan 1, 1970
0
nikhil said:
While brinstorming with some of my undergrad buddies, we hi upon a
project which requires tracking the motion of a hand in a 3D
environment and pass its coordinates to a computer. Now, we visualised
a metal grid or something with matrix of some kind of receivers[maybe
LDRs or RF ] .But the problem is what transmitter to use on the hand?
What comm.media[ laser,radio, sonic....] to go in for? If we use a
point transmitter, the hand may obstruct its path to the receiver. Is
there some whacky idea We have overlooked?
p.s he size of the grid is around .5 x .5 x .5 metres by

Stick an ultrasonic transmitter on the hand, and do time of flight to an
array of recevers situated around the grid.
As the system will know when the pulse is transmitted, the fact that one
side of the grid may be obscured by the hand should not be a problem.

For an interesting existing system (but on a rather bigger scale) check out
the "Wybron Autopilot". It is just possible that there may be a patent that
could be interesting reading.

Regards, Dan.
 
T

The Real Andy

Jan 1, 1970
0
While brinstorming with some of my undergrad buddies, we hi upon a
project which requires tracking the motion of a hand in a 3D
environment and pass its coordinates to a computer. Now, we visualised
a metal grid or something with matrix of some kind of receivers[maybe
LDRs or RF ] .But the problem is what transmitter to use on the hand?
What comm.media[ laser,radio, sonic....] to go in for? If we use a
point transmitter, the hand may obstruct its path to the receiver. Is
there some whacky idea We have overlooked?
p.s he size of the grid is around .5 x .5 x .5 metres by

Small area, but I reckon a CCD camera may do the trick. Some trick
coding required though.

http://www.hawkeyeinnovations.co.uk/coaching.htm shows a neat
application that we use here in AU to view the cricket. Tis also used
in many other sports.

The CSIRO has also used similar technology to allow a robot to place
explosives into drilled holes in mines.
 
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