A new spatial domain algorithm for gray scale images watermarking

This paper proposes a new algorithm of watermarking in spatial domain. We choose spatial domain to take advantage of its relatively low calculation complexity when compared to any technique requiring domain transforms. This algorithm is implemented via pixel by pixel comparison between host image and watermark. For the each pixel of host image, if its correspond value equal to compared pixel in watermark, we save its position as key. Therefore, we call this algorithm as ldquoSave Algorithmrdquo. Our accurate algorithm doesnpsilat make any change in host image, so, our new algorithm shows high invisibility. On the other hand, we have no problem for watermark extraction. In fact watermark extraction process is very simple. We also provided robustness evaluation of our proposed algorithm against several attacks by calculation of ldquopeak signal to noise ratiordquo (PSNR). In general, the higher PSNR values imply lowest change in image that is attacked by several methods.

[1]  Binh Pham,et al.  Performance Factors Analysis of a Wavelet-based Watermarking Method , 2005, ACSW.

[2]  Walter Bender,et al.  Techniques for data hiding , 1995, Electronic Imaging.

[3]  Gordon W. Braudaway,et al.  Opportunities for watermarking standards , 1998, CACM.

[4]  M.S. Bouhlel,et al.  A Secure fragile Watermarking Algorithm for medical Image Authentication in the DCT Domain , 2006, 2006 2nd International Conference on Information & Communication Technologies.

[5]  M.S. Bouhlel,et al.  Medical Image Watermarking Scheme for preserving the image history , 2006, 2006 2nd International Conference on Information & Communication Technologies.

[6]  S. Pereira,et al.  Attacks on digital watermarks: classification, estimation based attacks, and benchmarks , 2001, IEEE Communications Magazine.

[7]  Ramiro Jordan,et al.  On digital image watermarking robust to geometric transformations , 2000, Proceedings 2000 International Conference on Image Processing (Cat. No.00CH37101).

[8]  Ingemar J. Cox,et al.  Secure spread spectrum watermarking for multimedia , 1997, IEEE Trans. Image Process..

[9]  S. Atawneh.  A New Algorithm for Hiding Gray Images using Blocks , 2006, 2006 2nd International Conference on Information & Communication Technologies.

[10]  Sviatoslav Voloshynovskiy,et al.  Watermark copy attack , 2000, Electronic Imaging.

[11]  Sotiris Pavlopoulos,et al.  A medical image watermarking scheme based on wavelet transform , 2003, Proceedings of the 25th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (IEEE Cat. No.03CH37439).

[12]  E. Zagrouba,et al.  Content Adaptive Watermarking Based on Regions Segmentation , 2006, 2006 2nd International Conference on Information & Communication Technologies.

[13]  Ingemar J. Cox,et al.  Review of watermarking and the importance of perceptual modeling , 1997, Electronic Imaging.

[15]  Ingemar J. Cox,et al.  A Review of of Watermarking Principles and Practices , 1999 .