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Vol: 52(66) No: 4 / December 2007  Digital Watermarking Using Principal Component Analysis Daniela Stanescu Computer and Software Engineering Department, “Politehnica” University of Timisoara, Faculty of Automation and Computers, 2 Parvan st., Timisoara, Romania, phone: (40) 256-403271, e-mail: stanescu@ac.upt.ro Daniel Borca Computer and Software Engineering Department, “Politehnica” University of Timisoara, Faculty of Automation and Computers, 2 Parvan st., Timisoara, Romania, e-mail: dborca@bitdefender.com Mircea Stratulat Computer and Software Engineering Department, “Politehnica” University of Timisoara, Faculty of Automation and Computers, 2 Parvan st., Timisoara, Romania, e-mail: smircea@cs.utt.ro Keywords: Digital watermarking, Principal Component Analysis, steganography, detectability, DCT Abstract Digital watermarking has become a de facto standard used against illicit copying and distribution of copyright material. This paper presents improved methods for embedding signature information, based on the decorrelation property of the Principal Component Analysis (PCA). References [1]I. Cox, J. Killian, W. J. Dowling, F. M. Boland, “Watermarking digital images for copyright protection”, IEEE Proceedings on Vision, Image and Signal Processing 143, pp 250-256, August 1996. [2]Pao-Ta Yu, Hung-Hsu Tasi, and Juh-Shyan Lin, \"Digital watermarking based on neural networks for color images,\" Signal Processing, vol. 81, pp. 663­671, 2001. [3]Piyu Tsai, Yu-Chen Hu, and Chin-Chen Chang, \"A color image watermarking scheme based on color quantization,\" Signal Processing, vol. 84, pp. 95­106, 2004. [4]Chun-Hsien Chou and Tung-Lin Wu, \"Embedding color watermarks in color images,\" EURASIP Journal on Applied Signal Processing, vol. 1, pp. 327­332, 2001. [5]Arash Abadpour and Shohreh Kasaei, “A new PCA-based robust color image watermarking method”. [6]Dafas, P., Stathaki, T., “Digital image watermarking using block-based Karhunen-Loeve transform”, Proc. 3rd International Symposium on Image and Signal Processing and Analysis, 2003, pp. 1072-1075. [7]M. Barni, F. Bartolini, V. Cappellini and A. Piva “A DCT domain system for robust image watermarking”, Signal Processing, vol. 66, no.3, pp. 257-372, 1998.