[Image-SIG] Newbie question on color detection and tracking

adam naples adam.naples at yale.edu
Wed Aug 15 21:16:58 CEST 2007

a) yes, a lot,
b) I don't think PIL is the way to go, use openCV, you can use it  
with python.

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.

hope this helps

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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