Watermarking in conjugate ordered dither block truncation coding images

1
Watermarking in conjugate ordered dither block
truncation coding images

• Source Signal processing, Vol.89,
• pp. 1864-1882,2009
• Authors Jing-Ming Guo, Min-Feng Wu, Yong-Chuen
  Kang
• Speaker Chun-Yu Wu
• Date 2009/7/2

2
Outline

• Introduction
• Proposed scheme
• Experimental results
• Conclusions

3
Introduction
BTC
High mean 127.7
Low mean 121.1
Average 124
bitmap
Sub-block
4
Introduction
W
If Wi,j 0
If Wi,j 255
5
Proposed scheme - watermark
Max 130 Min 120 K 130-120 10
DA
DA
Sub-block
Value of watermarking as 0
6
Proposed scheme - extraction
Max 130 Min 120 K 130-120 10
Average block
7
Proposed scheme - extraction
C1
DA
122.5
Compare with average block
DA
C2
8
Proposed scheme - extraction
C1
The matching number with C1 12
The value of watermark is 0
C2
The matching number with C2 8
9
Experimental results (1/4)
10
Experimental results (2/4)
11
Experimental results (3/4)
12
Experimental results (4/4)
13
Conclusions

• ODBTC reduces blocking effects inherent in BTC
  and offers better image quality in high
  compression ratio applications.