a) yes, a lot,
b) I don't think PIL is the way to go, use openCV, you can use it
with python.
http://sourceforge.net/projects/opencvlibrary/
c) computer vision is hard, but it sounds like you're talking about a
very basic optitrack (maybe? I have no idea). I've not used them but
remember to think about what will happen if the user occludes the
color or t-shirt. Another reason this is hard is that the shadows
and illumination will change a lot from frame to frame, so a
background substitution will be hard even if the person is in a grey
room with no furniture or wall decorations, they'll still cast
shadows. My suggestion, that may make your life a lot easier is to
install open cv and run the python lucas-kanade demo. it will capture
frames from a camera, and you click the feature that you want it to
track, if the conditions are good, it tracks it, and can do a pretty
good job; even with multiple features.
http://www.naturalpoint.com/optitrack/
hope this helps
-a
On Aug 13, 2007, at 10:08 PM, Jonathan Shao wrote:
I'm a relative newbie when it comes to image processing, so please
bear with me...
What I want to do is to set up a static camera such that it can
track the motion of a person wearing a particular color marker
walking around in an interior room (no windows). The "color marker"
can be something like a t-shirt with a unique color distinctly
different from the background, and I think I'll need to take
periodic snap-shots of the room to simulate real-time tracking as
closely as possible. In effect, it's a simplified scenario for
person tracking.
For now, I'm just trying to get the color detection part of my
project working. I think I should be to just do a simple background
subtraction between a snapshot by the camera and a reference image
of the background, and that should be able to give me good color
detection. The issues I'm concerned with:
a) Do I need to worry about different hues/illuminations of the
same color?
b) Is this a realistic method to implement with the PIL, or would I
have to deal with issues of speed while trying to track the marker?
--
"Perhaps we all give the best of our hearts uncritically, to those
who hardly think about us in return."
~ T.H.White
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