How I can find out the center of any detected object?

I'm working on hand gesture recognition, and I try to make the classification based on hand position. I already write the code that detect the hand, but I need two things: 1- save the hand after detecting in separate variable, 2- I want to get the x,y,z coordinates or at least x,y coordinates of the center of the hand? I hope I can fide the answers. Thanks

Answer 1

[Image Analyst]

Use regionprops to get the centroid:

labeledImage = bwlabel(binaryImage);
measurements = regionprops(labeledImage, 'Centroid');
centroid = measurements.Centroid;

See my Image Segmentation Tutorial for a full demo: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

I don't know what "save the hand" means. What does it mean to you? I mean exactly , because there are multiple interpretations of that though you might not realize it.