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/usr/lib/scilab-sivp/demos/bgfg.sce is in scilab-sivp 0.5.3+svn287-2ubuntu1.

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// ====================================================================
function demo_bgfg()
  filename =  fullpath(getSIVPpath() + '/images/video.avi');
  n = aviopen(filename);
  im = avireadframe(n);
  fgim = uint8(zeros( size(im,1), size(im,2), 3)) ;
  fg = detectforeground(im, 'LI');//create background model
  while ~isempty(im),
    fg = detectforeground(im); //get the foreground mask 
    fgim(:,:,1) = fg;
    fgim(:,:,2) = fg;
    fgim(:,:,3) = fg;
    imshow([im; fgim]);   
    im = avireadframe(n);
  end
  aviclose(n);
endfunction
// ====================================================================
demo_bgfg();
clear demo_bgfg;
// ====================================================================