How can I detect objects and distinguish them from each other?

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They can be in different colors, or maybe it's better to distinguish them bye edge detection, or some thing else which I need you help me to use a suitable method. Purpose is to detect objects and find their movement if exist and estimate their direction and velocity. Thank you

Accepted Answer

Image Analyst
Image Analyst on 14 Dec 2013
Please try out my image segmentation demos and color segmentation demos: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862
To do object tracking across different images or video frames, you can use the Computer Vision System Toolbox
  4 Comments
roudabe
roudabe on 21 Dec 2013
Edited: roudabe on 22 Dec 2013
Hi, I used regionprops with properties : PixelList to have a set of region pixels, but now I need the pixel list of region for every frame!!! What should I do in for loop?
xyloObj = VideoReader('vid.avi');
nFrames = xyloObj.NumberOfFrames;
vidHeight = xyloObj.Height;
vidWidth = xyloObj.Width;
mov(1:nFrames) = ...
struct('cdata', zeros(vidHeight, vidWidth, 3, 'uint8'),...
'colormap', []);
for k = 1 : nFrames
mov(k).cdata = read(xyloObj, k);
s = regionprops(mov(k).cdata,'PixelList');
region=s.PixelList;
imshow(mov(k).cdata)
end
Image Analyst
Image Analyst on 21 Dec 2013
s is structure array, you need to index it, like s(k).PixelList. A single frame might have 2 or 10 different regions so you need an index. But then after you (attempt to) get it, you aren't doing anything with it.

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