with video processing, you want to write out a list of every given
you have in your system... these kinda of problems tend to be tailor
made to the problem at hand. so lets ask some questions:
so the marker has a size, and you need find that size and location?
can there be more than one marker? (ie, more than one animal?)
are the markers a fixed color?
how differentiated are the markers from all from other colors in the
scene?
is the video live or edited? (ie, can be be sure there will be no
cuts between frames, and that a marker will only disappear when the
animal moves off screen?)
are we assured the marker will always be visible, or can it be
occluded by the scene, or when the animal turns around?
if there can be more than one animal at a time, is the goal to merely
count them, or track specific animals between frames?
feel free to reply offlist, i'm not sure this kind of thing will
interest most people. but with these questions answered, i should be
able to give you some pointers to get this running at a good clip.
mike
--
Mike Woodworth
[EMAIL PROTECTED]
On Sep 24, 2006, at 4:45 PM, John Kubie wrote:
I want to find each of the "blobs" (sets of contiguous pixels). For
each blob I want to get the center of mass and number of pixels. I
actually have a method for doing this, but it seems very slow and
inefficient. As I said, I did some web searching and it seems to be
a fairly common problem, but I couldn't get sufficiently deep into it.
The overall problem is tracking a marker on an animal from frames
of a movie. As one can imagine, doing this on each frame is very
time consuming. I've thought of using frame differences, but I'm
not convinced it will buy much.
I hadn't thought of using floodfill. I can see how this would be a
fast method to paint a blob. But I don't see how I can efficiently
get information about which pixels have been painted without
painstakingly going through each pixel and looking at its color.
john kubie
On Sep 24, 2006, at 3:57 PM, Phil M wrote:
What exactly are you looking for?
If you are looking for the difference between two pictures, you
might try using a formula to convert a color photo into 1-bit, and
then XOR the difference between the two. Let me know if this is
what you mean and I will see if I can do something about it.
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