%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%  Compute SIFT features 
%
%  Hao Jiang, Oct, 2007
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

function compfeature(start_frame_num, end_frame_num)

for vframe = start_frame_num :  end_frame_num
  vframe
  filename1 = sprintf('./video/%d.jpg', vframe);
  cmd = sprintf('convert %s image1.pgm', filename1);
  system(cmd);
  image1 = 'image1.pgm';

  [im1, des, loc] = sift(image1);

  cmd = sprintf('save ./data/des_%d.mat des', vframe);
  eval(cmd);
  cmd = sprintf('save ./data/loc_%d.mat loc', vframe);
  eval(cmd);
end