how to put building box on a particular person

I am trying to put a building box on a particular person using

%%Calculate Custom Pixel Value-Based Properties
s = regionprops(BW, G, {'Centroid','PixelValues','BoundingBox'});
s(k).StandardDeviation = std(double(s(k).PixelValues));%for getting its standard deviation 
sStd = [s.StandardDeviation];
lowStd = find(sStd > 19.0 );
rectangle('Position', s(lowStd(k)).BoundingBox,'EdgeColor','y');%for building the box

But i am not getting the whole person in the box.

What to do to build box for whole person

[Walter Roberson]

This would not get the whole person in the box if your BW does not include the whole person.

[swati]

then what should i do.give me some hint

[Walter Roberson]

Post your sample images, and your code that creates the BW array.

http://www.mathworks.com/matlabcentral/answers/7924-where-can-i-upload-images-and-files-for-use-on-matlab-answers