My roommate showed me a cool feature
on his camera. You hold a button
and it projects a few lazer squiggle
patterns in the shape of a square.
It is auto-focus for the camera. Are
there units like this (the laser +
box pattern) for sale anywhere? I
would put one on the robot and use it
for distance sensor. Would this
pattern be detectable by digital
camera in the LIGHT? You cannot
see the pattern when it is light,
but are digital cameras able to
detect it? I know they can see IR
firstname.lastname@example.org (Rich J.) wrote in message
I don't know of any for sale, but I saw this interesting link to a
"structured light vision" project a while ago:
These are designed for low-light camcorders (and cameras), to enable
auto-focus in low-contrast situations. The electronics in camera don't
really detect the pattern, but rather look for the difference in
contrast that the pattern projects.
Under full light conditions the digital camera/camcorder doesn't need
this pattern, because there's enough contrast in the scene to set focus.
So they don't care if the laser is too weak to project a visible beam in
regular light. The laser is not very strong, on purpose.
It would be cool if these cameras actually registered the pattern and
did some image processing to set the focus, but that's not how they
work. To use them in vision for sensing distance you'd need a
sophisitcated lens focusing system to complete the servo mechanism. This
would be basically the equivalent of a high-end camera/camcorder lens.
Ptetty expensive stuff.
Author: Robot Builder's Bonanza
Budget Robotics: http://www.budgetrobotics.com
Rich J. wrote:
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