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

Jonathan Shao jzshao1 at gmail.com
Tue Aug 14 04:08:56 CEST 2007

I'm a relative newbie when it comes to image processing, so please bear with

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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