DocumentCode :
3283402
Title :
Revealing the true achievable rates of scalar Costa scheme
Author :
Péréz-Freire, Luis ; Pérez-González, Fernando ; Voloshynovskiy, Sviatoslav
Author_Institution :
Dept. of Signal Theor. & Commun., Vigo Univ., Spain
fYear :
2004
fDate :
29 Sept.-1 Oct. 2004
Firstpage :
203
Lastpage :
206
Abstract :
By abandoning the assumption of an infinite document to watermark ratio, we recompute the achievable rates for Egger´s scalar Costa scheme (SCS, also known as scalar distortion compensated dither modulation) and show, as opposed to the results reported by Eggers, that the achievable rates of SCS are always larger than those of spread spectrum (SS). Moreover, we show that for small watermark to noise ratios, SCS equivalent to a two-centroid problem, thus revealing interesting relations with SS and with Malvar´s improved spread spectrum (ISS). We also show an interesting behavior for the optimal distortion compensation parameter. All these results aim at filling an existing gap in watermarking theory and have important consequences for the design of efficient decoders for data hiding problems.
Keywords :
data encapsulation; modulation; quantisation (signal); watermarking; scalar Costa scheme; scalar distortion compensated dither modulation; spread spectrum; watermarking theory; AWGN; Additive white noise; Data encapsulation; Decoding; Gold; Quantization; Signal to noise ratio; Spread spectrum communication; Statistics; Watermarking;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Multimedia Signal Processing, 2004 IEEE 6th Workshop on
Print_ISBN :
0-7803-8578-0
Type :
conf
DOI :
10.1109/MMSP.2004.1436528
Filename :
1436528
Link To Document :
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