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Friday, July 23, 2010

PowerPoint Presentation On Digital Watermarking

PPT On Digital Watermarking


Digital Watermarking Presentation Transcript:
1. Information Hiding…..
started with Steganography (art of hidden writing): The art and science of writing hidden messages in such a way that no one apart from the intended recipient knows of the existence of the message. The existence of information is secret.

2. Histaeus used his slaves (information tattooed on a slave’s shaved head )

3. What is a watermark ?
A distinguishing mark impressed on paper during manufacture; visible when paper is held up to the light (e.g. $ Bill)

4. Digital Watermarking:
Application of Information hiding (Hiding Watermarks in digital Media, such as images) Digital Watermarking can be ? - Perceptible (e.g. author information in .doc) - Imperceptible (e.g. author information in images) Visibility is application dependent Invisible watermarks are preferred ?

5. Copyright Protecton:
To prove the ownership of digital media

6. Tamper proofing:
To find out if data was tampered.

7. Quality Assessment:
Degradation of Visual Quality

8. Watermarking Vs Cryptography
Watermark D Hide information in D Encrypt D Change form of D

9. Data (D), Watermark (W), Stego Key (K), Watermarked Data (Dw) Embed (D, W, K) = Dw Extract (Dw) = W’ and compare with W (e.g. find the linear correlation and compare it to a threshold) Q. How do we make this system secure ? A. K is secret (Use cryptography to make information hidden more secure)

10. For more please refer our PPT. Thanks.

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