webcam + blobfinder range?
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webcam + blobfinder range?
by Paul Ozog
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Re: webcam + blobfinder range?
by Rich Mattes-2
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I can think of two ways to do this: 1. Stereo vision. You can use two cameras to get a
kind of “depth perception,” if you calibrate them correctly.
Then you can correlate your found blobs to their position on the generated
range image and see what range your blob falls at. It’s not that
easy to do, but there’s plenty of information to be found on google. 2. Perspective transform. If you know where your camera is
in relation to the ground at all times, it’s possible to calibrate it and
do a perspective transform. You basically project your camera’s
field of view onto a plane (usually the ground plane,) and each pixel of the
camera image corresponds to an (x,y) point on the ground. This only works
if you’re looking down at the ground though. If you’re
looking straight ahead with the camera, stereo vision or some sort ranging
device (lidar, sonar, IR range finder) are your best bet Rich From: Paul Ozog
[mailto:pjozog@...] Can webcams that provide
blobfinders give you ranges to the detected blobs? Of course, the range member
is in all player_blobfinder_blob structs, but i don't see how a webcam can tell
how far away a blob is. I want to make sure i can use webcams as range
finders for blobs before i start buying webcams that are supported in
player. ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Playerstage-users mailing list Playerstage-users@... https://lists.sourceforge.net/lists/listinfo/playerstage-users |
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