Blind image data hiding based on self reference

1
Blind image data hiding based on self reference

• Source Pattern Recognition Letters 25(2004),
  1681-1689
• SCI 65(51/78, Impact Factor 0.576)
• Authors Yulin Wang, Alan Pearmain
• Data 2005/7/9
• Speaker Shu-Wei Guo(???)

2
Outline

• Introduction
• Proposed schemes
• Experimental results
• Conclusions

3
Introduction

• Requirements for Watermarking
• Imperceptibility
• Robustness
• Capacity
• Blindness

4
Proposed schemes

• Spatial technique
• A data hiding based on the estimation of
  luminance value in spatial domain
• DCT technique
• Data hiding technique based on the estimation of
  DCT AC coefficients

5
Spatial technique
6
DCT technique(1/3)

• Choi and Aizawas technique(1999)
• Change DC values

7
DCT technique(2/3)

• Proposed technique
• Change AC values

8
DCT technique(3/3)
9
Experimental results
10
Experimental results
11
Experimental results
12
Experimental results
13
Experimental results
14
Experimental results
15
Experimental results

• Original image
• Watermarked image
• Noise added to (b)
• JPEG compression(99) of (b)

16
Experimental results

• Image (b) downsized and upsized by a factor of 4
• Image (b) after histogram equalized
• Image (b) sharpened
• Image (b) median filtered

17
Conclusions

• The quality and capacity of two proposed
  technique is better than Chois technique.
• The DCT technique is more robust than Chois
  technique.
• The watermark technique can be used in MPEG-1,
  MEPG-2 and H.262.