VIDEO WATERMARKING

P r e s e n t e d by: - 2451-12-735-0702451-12-735-0822451-12-735-109

G u i d e d by: -K.Usha

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CONTENTS Introduction Types of watermarking Desired properties Need for video watermarking A generic approach to watermarking digital data Structure of a Typical Video Watermarking System An algorithm of video watermarking Attack on watermark Applications of watermarking Conclusion References

INTRODUCTION

Definition: A digital watermark is a digital signal or pattern inserted into a digital document such as text, graphics or multimedia, and carries information unique to the copyright owner.

Video watermarking is an extension of thisconcept.

Image Video Audio

Types of Video Watermarking 1.Visible watermarking

it’s use : -1. To discourage unauthorized usage.2. As an advertisement

Visible watermark is a translucent overlaid into an image and is visible to the viewer. Visible watermarking is used to indicate ownership and for copyright protection.

Original Image Watermarked Image

NSN Watermark

2.Invisible watermarks

• Invisible watermark is embedded into the data in such a way that the changes made to the pixel values are perceptually not noticed. Invisible watermark is used as evidence of ownership and to detect misappropriated images.

• Its main use is to send secret information.

Original Image Watermarked Image

DESIRED PROPERTIES Robust

Video watermarking ( frame averaging, frame dropping, frame swapping... )

Recoverable from a document Removable by authorized users Low error probability Provide the original information embedded

reliably Capacity Invisible

Need for video watermarking Protect copyright of a data. Video Watermarking can help• Prove ownership• Identify a misappropriating person• Trace the video dissemination

Broadcast Monitoring Video watermarking introduces some issues not

present in image watermarking Frame averaging, frame dropping, frame

swapping …

A Generic approach to watermarking digital data

There are 3 main processes involved in watermarking —

1. Insertion of a watermark

2. Detection of a watermark

3. Removal of a watermark

watermark insertion unit The user key , input video and the watermark

are passed through a watermark insertion unit.

This results in a watermarked video.

Watermark Extraction Unit Two phases:-

1. Locating the watermark

2. Recovering the watermark information.

Watermark Detection Unit Consists of :- An extraction unit to first extract the watermark. Compare it with the original watermark inserted. The output is Yes or No depending on whether the watermark is present.

FLOWCHART

Algorithm for Watermark Embedding using LSB TechniqueFirst the video is divided in number of frames using

MATLAB function in bmp file format(bmp file format is uncompressed file format & this format restores the binary data in much safe way).

Then the number which we need to encrypt (as a key) is converted in binary form. This key number is then placed in message at LSB position. Then for each frame ,message is watermarked at respective

LSB position.At end all frames are again combined and video is formed

with uncompressed file format to restore the data integrity.While extracting we get the exact message image and the

key encrypted into the message image.

ATTACKS ON WATERMARK Compression Rescaling Cropping Multiple watermarks

Frame averaging Frame dropping Frame swapping Statistical analysis

• Owner Identification• Piracy prevention in CDs• Hidden communication• Transaction Tracking• Content Authentication• Broadcast Monitoring• Device Control• Automatic monitoring of copyrighted material

onthe Web

APPLICATIONS OF WATERMARKING

CONCLUSIONDigital watermark is an important step toward management

of copyrighted and secured documents. Any kind of digital data like video (consists of image frames), audio, text can easily watermarked.

Visible watermarking technique is used by the Television channels to restrict the illegal transmission & broadcasting of T.V. programs by inserting the watermark at the corner of the channel signals.

Illegal use of the watermarking technique can be done by the terrorists or Other persons who are against the community by transferring the hiding information through watermarks.

But there are watermarking agents which act as a detective through the transmission & reception of data/information.

So, the watermarking technique is very much popular in these days, only thing we need now days is recovery of Digital watermark if there is attack on it.

REFERENCES F. Hartung and M. Kutter, “Multimedia watermarking techniques”,Proceedings of

the IEEE, vol. 87, no. 7 , July1999.

I. Cox, J. Kilian, T. Leighton, and T. Shamoon, “Secure spread spectrum

watermarking for images, audio and video,” in Proc. IEEE Int. Conf. Image

Processing (ICIP 96), Lausanne, Switzerland, Sept. 1996.

Yeo and M.M. Yeung, “Analysis and synthesis for new digital video applications,”

icip, International Conference on Image Processing (ICIP'97),vol. 1, pp.1,1997.

Ingemar J. Cox, Matthew L. Miller, Jeffrey A. Bloom “Digital Watermarking”

Morgan Kaufmann Publishers ISBN: 1-55860-714-5

1.0, May2008.

Website:

http://www-ee.uta.edu/dip/Courses/EE5355/jpeg.html

“Privacy principles for digital watermarking”, Ver. https://www.cdt.org/