Digital Watermarking -Project Proposal (EE5359: Multimedia processing) Under the Guidance of Dr. K. R. Rao Submitted by: Ehsan Syed The University of Texas at Arlington – Spring 2011

Introduction Digital watermarking is based on the science of steganography [1] or data hiding. Steganography comes from the Greek meaning ‘covered writing’. Steganography is defined as the practice of undetectably altering a work to embed a secret message. It is an area of research of communicating in a hidden manner.

Introduction.. Steganography and watermarking rely on imperfections of human senses. The human eye has a limited dynamic range so low quality images can be hidden within high quality images [2].

Basic Principle There are three main stages in the watermarking process [3]: generation and embedding attacks retrieval/detection

Generation and Embedding Generation of watermarks is an important stage of the process. Watermarks contain information that must be unique otherwise the owner cannot be uniquely identified. In embedding, an algorithm accepts the host and the data to be embedded and produces a watermarked signal. Various algorithms have been developed so far [4-13].

Attacks The watermarked signal is then transmitted or stored, usually transmitted to another person If this person makes a modification, this is called an attack. There are many possible attacks.

Retrieval/Detection Detection is an algorithm which is applied to the attacked signal to attempt to extract the watermark from it. If the signal was not modified during transmission, then the watermark is still present and it can be extracted.

Block diagram Fig.1: Basic block diagram of digital watermarking

Types of watermarking There are mainly three types of watermarking [14]: Visible watermarking Invisible watermarking Dual watermarking

Techniques of watermarking There are two major techniques of watermarking [15]: Spatial domain: slightly modifies the pixels of one or two randomly selected subsets of an image Frequency domain: this technique is also called transform domain. Values of certain frequencies are altered from their original.

Project Goals The goals of this project are: to embed a watermark into an image using LSB technique compressing the watermarked image decompressing it extract the watermark from the image

References 1.L.M. Marnel et al, “Spread spectrum image steganography”, IEEE Transactions on Image Processing, pp , Aug J.J.K O-Ruanaidh et al, “Watermarking digital images for copyright protection, IEE Proceedings in Vision”, Image and Signal Processing, pp , Aug I. J. Cox and M. L. Miller, “A review of watermarking and the importance of perceptual modeling”, Proceedings of Electronic Imaging, February H.J. Wang et al, “Wavelet based digital image watermarking “, Optics Express, PP , Dec P.-T.Yu et al, “ Digital watermarking based on neural networks for color images”, Signal Processing, PP , Mar J. O-Ruanaidh et al, “Cryptographic copyright protection for digital images based on watermarking techniques”, Theoretical Computer Science, pp , Sep C. Fornaro and A.Sanna, “Public key watermarking for authentication of CSG models”, Computer-Aided design, pp , Oct M. Barni et al, “Copyright protection of digital images by embedded unperceivable marks”, Image and Vision Computing, pp , Aug J.R. Hernandez et al, “Improving the performance of spatial watermarking of images using channel coding”, Signal Processing, pp , July S. Pereira et al, “Optimal transform domain watermark embedding via linear programming”, Signal Processing, pp , July F. Perez-Gonzalez et al, “Approaching the capacity limit in image watermarking: a perspective on coding techniques for data hiding applications”, Signal Processing, pp , July R. Baitello et al, “From watermark detection to watermark decoding: a PPM approach”, Signal Processing, pp , July M. Barni et al, “A DCT-domain system for robust image watermarking”, Signal Processing, pp , May S. P. Mohanty, et al, “A Dual Watermarking Technique for images”, Proceedings of the seventh ACM international conference on Multimedia, pp 49-51, F. Hartung and M. Kutter, “Multimedia watermarking techniques”, Proceedings of the IEEE, Vol. 87, No. 7, pp 1079 – 1107, July 1999