How do i plot a bounding box around the output of a Moving object algorithm?

ive used the background subtraction process to find moving objects from a real time video input and would like to plot the bounding box around only the moving object detected. is it possible??? and can i plot the centroid of the same???

Answer 1

[ChristianW]

With Image Processing Toolbox:

doc regionprops

An example:

BW = imread('text.png'); imshow(BW)
bb  = regionprops(BW, {'BoundingBox','Centroid'});
centroids = cat(1, bb.Centroid);
boundingboxes = cat(1, bb.BoundingBox);
hold on
plot(centroids(:,1), centroids(:,2), 'r+')

for k = 1:size(boundingboxes,1)
    rectangle('position',boundingboxes(k,:),'Edgecolor','g')
end
hold off

[Image Analyst]

The Computer Vision System Toolbox has lots of demos for tracking. You can search for them online. Here's one page: http://www.mathworks.com/products/computer-vision/description4.html. I've also seen a demo tracking people. You might save yourself a lot of time and effort (more than the cost of the toolbox) if you get that toolbox. It's not easy so take advantage of a whole team of people who worked through the difficult issues to make it easy for you.

[Sanjeev]

thanks for that Image Analyst.

i used the centroid code.. But when more than 2 objects come into picture i shld be getting 2 individual centroids rather than 1. how do i modify this?????