DocumentCode :
698495
Title :
Improved embedding of multiplicative watermarks via space-time block coding
Author :
Karybali, Irene G. ; Berberidis, Kostas
Author_Institution :
Dept. of Comput. Eng. & Inf. & CTI/R&D, Univ. of Patras, Rio-Patras, Greece
fYear :
2005
fDate :
4-8 Sept. 2005
Firstpage :
1
Lastpage :
4
Abstract :
In this paper, a new scheme for image watermarking in spatial domain based on space-time block coding is proposed. Specifically, a 4×4 real orthogonal design is employed for embedding a multiplicative watermark in the image. The image is divided into four blocks, which, after some simple operations, can be viewed as four different flat fading channels. At the receiver´s end, a low cost maximum likelihood decoding is performed based only on linear processing. This scheme turns out to perform much better than repetitive watermarking, taking advantage of the well-known merits of space-time block coding, i.e., it achieves full diversity offering at the same time the maximum possible transmission rate for real constellations.
Keywords :
image coding; image watermarking; maximum likelihood decoding; space-time block codes; linear processing; maximum likelihood decoding; multiplicative image watermarking; space-time block coding; Block codes; Fading; Receivers; Robustness; Signal to noise ratio; Watermarking;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signal Processing Conference, 2005 13th European
Conference_Location :
Antalya
Print_ISBN :
978-160-4238-21-1
Type :
conf
Filename :
7078080
Link To Document :
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