[WM]: Sample Pair

[Arijit Sur <arijitsur2002@yahoo.co.in>]

Dear Watermarkers
   
  I am trying to implement sample pair analysis for LSB replacement steganalysis.
  I have a few doubts...
  a) How we choose a pair of pixels? If we choose neighbouring pixels, since most of the pixels have eight immediate neighbour, can
we choose arbitrarily or choose all eight pairs for that one pixel? For the later case, is there any effect on performance on the
algorithm?
  b) The value of |X| |Y| |Z| |W| |V| are changing with choice of pair of pixels. These value are used to predict relative message
length q. So how q varies with the changes with size of these sets?
   
  Any sort of suggestion is welcome.
  thanx in advances 
   
  Arijit
    


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