1. A
SEMINAR
ON
DIGITAL WATERMARKING
PRESENTED BY:
VIDHI AGARWAL
CS FINAL YR.
CSE/1754

2. TABLE OF CONTENTS
 Introduction to DW
 Information Hiding
 Process of DW
 Watermarking issues
 Types of DW
 Watermark attack
 Application of DW
 Limitations of DW
 Conclusion

3. INTRODUCTION TO DW
 Digital watermarking is the process of
embedding information into a digital signal.
 The purpose of digital watermarking is to
provide copyright protection.

4. INFORMATION HIDING
 The process of secretly embedding inside a
data source without changing its perceptual
quality.
 DW and steganography are the
implementations of information hiding.

5. CONTINUED…..
Extraction
function
M(L)
Channel
Retrieved information
M(L)
Information to embed
Embedding
function
^
Key
Original
data

6. PROCESS OF DW
Fig. Watermark embedding

7. CONTINUED….
Fig. Watermark detection

8. DETECTIONS OF WATERMARK
Fig . Using digital watermarks for integrity verification: the
protected image is the image (a) above; a modified image is
obtained by swapping the numbers 9 and 4 of the number plate
(b); digital watermarking technology allows detecting and
highlights the modified areas, as shown on (c).

9. WATERMARKING ISSUES
 Capacity
 Robustness
 Transparency
 Security

10. TYPES OF DW
Fig. Types of watermarking

11. Visible watermarking
 In visible watermarking, the information is
visible in the picture or video.

12. Invisible watermarking
(a)original image (b) watermarked image

13. WATERMARK ATTACKS
 Active Attacks.
 Hacker attempts to remove or destroy the
watermark.
 Passive Attacks.
 Hacker tries to find if a watermark is present.
 Removal of watermark is not an aim.

14. CONTINUED…
 Collusion Attacks.
 Hacker uses several copies of watermarked
data (images, video etc.) to construct a copy
with no watermark.
 Forgery Attacks.
 Hacker tries to embed a valid watermark

15. APPLICATIONS OF DW
 ID card security.
 Ownership assertion.
 Copy prevention or control.
 Fraud and tamper detection.

16. LIMITATIONS OF DW
 Digital watermarking does not prevent
copying or distribution.
 Digital watermarks cannot survive every
possible attack.

17. CONCLUSION
 Digital watermarking is a rapidly evolving
area of research and development.
 One key research problem that we still face
today is the development of truly robust,
transparent and secure watermarking technique
for different digital media including images,
video and audio.

18. QUERIES???

19. THANK YOU!!!!!!!