AN ovel Robust Watermarking Scheme Based on Statistic by dbfQd67

VIEWS: 4 PAGES: 8

									A Novel Robust Watermarking Scheme
  Based on Statistic Characteristic of
    Wavelet Domain Coefficients
  Authors: Li Fan, Tiegang Gao
  Source: 2009 International Conference on Signal
         Processing Systems
  Speaker: Pei-Lin Tsou
  Date: April 14, 2010



                                                    1
 Discrete wavelet transform (DWT)
• A method which is used to transform
  image from spatial domain to frequency
  domain.




                                           2
         Proposed Scheme - Embedding
                               LL                          I
                        I

                    DWT




        If W = 1,
I                           T 1
5   4   7   6   1   4
1   1   7   2   2   4        W  0, 1  4  1  6  7 / 4  3.5  T modify
0   6   4   6   4   7
                             W  1, 2  (1  2  4  4) / 4  0.75  T modify
3   2   1   1   3   2
7   4   1   7   5   6        W  1, 4  (2  7  5  1) / 4  1.25  T
                                                                                3
2   5   2   2   6   6
                             W  0, 5  (3  7  6  6) / 4  0.5  T
Proposed Scheme - Watermark Detection


            LL’
 I’ 1   0 1 0 1 1 1 0
   0 1 1 1 0 0 0 1
                            1 1 1 0
   0 1 1 0 1 1 0 1
                            0 1 1 1
   1 0 0 0 1 0 0 1          1 1 1 1
   1 0 0 0 1 1 1 1          1 0 0 0
   0 0 1 0 0 1 0 0      Extracted Watermark
   0 1 1 1 1 0 1 1
   1 0 1 0 1 0 0 0
                                              4
    Experimental Results(1/3)
• PSNR for several watermarked images




                                        5
    Experimental Results(2/3)
• Normalized Correlation (NC) with attack




                                            6
Experimental Results(3/3)




                            7
             Conclusions
• Blind and robust
• Low capacity




                           8

								
To top