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Spread spectrum (SS) modulation is one of the most commonly used methods for data hiding. However, the capacity of SS-based methods is rather limited. To improve the hiding efficiency, this paper presents a method that employs the parallel combinatory spread spectrum (PCSS), in which the hidden data can be transmitted in parallel with a combination of a few pseudo noise sequences. An informed embedding...
Code phase shift keying (CPSK) is an efficient M-ary modulation that can be applied to spread spectrum (SS) based watermarking to improve the watermark payload. However, the host media acts as interference that degrades the watermark robustness, especially in high-payload applications. In this paper, an informed embedding method for CPSK-based watermarking is proposed. The host is utilized at the...
In this paper, the improved spread spectrum (ISS) modulation is modified and extended to cancel the host interference in the context of watermark decoding with unmatched filtering, where the reference sequence at the watermark decoder does not match with the embedded sequence. Then a robust and transparent audio watermarking scheme based on this extended ISS and a psychoacoustic model is proposed...
This paper describes an informed unipolar spread spectrum (SS) modulation to improve the performance of SS-based watermark extraction with self-synchronization. Compared with bipolar SS, unipolar SS, realized by employing a pair of orthogonal codes to represent the watermark bits, is more robust against the distorted correlation between the received watermarked signal and the reference. The informed...
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