A novel approach for extended insertion-capacity and encrypted-robust blind watermarking for still images in the DCT domain

Authors:
Chady El Moucary;Bachar El Hassan
Affiliations:
Department of Electrical, Computer and Communication Engineering, Notre Dame University-Louaize, Koura, Lebanon;Laboratory of Electronic Systems, Telecommunications and Networking, LASTRE, Lebanese University, Faculty of Engineering, Tripoli, Lebanon
Venue:
SSIP '09/MIV'09 Proceedings of the 9th WSEAS international conference on signal, speech and image processing, and 9th WSEAS international conference on Multimedia, internet & video technologies
Year:
2009

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Abstract

This paper presents a novel algorithm for blind watermarking still images in the DCT domain with advanced features. Nine AC values will be modulated to implant an encrypted watermark. Eight of them represent one byte of the useful data to be hidden and the ninth bit represents a key that will be used to scramble the message. Hence, the capacity of insertion is increased by 60% while preserving the imperceptibility criterion. The watermark cannot be hacked because it is scrambled using an individualized key of almost random length and type, hence high level of security. The simulation results reveal satisfactory performance of the algorithm and an acceptable PSNR and limited blocking artifacts.