Performance Evaluation of Spread Spectrum Watermarking using Error Control Coding
This work addresses the need for reliable and efficient watermarking in image signals, but it appears incremental as it builds on existing spread spectrum and wavelet methods.
The paper tackles the problem of embedding multiple watermark messages in images using a spread spectrum technique with error control coding, achieving improved robustness and efficient bandwidth utilization as demonstrated by experimental results.
This paper proposes an oblivious watermarking algorithm with blind detection approach for high volume data hiding in image signals. We present a detection reliable signal adaptive embedding scheme for multiple messages in selective sub-bands of wavelet (DWT) coefficients using direct sequence spread spectrum (DS-SS) modulation technique. Here the impact of volumetric distortion sources is analyzed on the ability of analytical bounds in order to recover the watermark messages. In this context, the joint source-channel coding scheme has been employed to obtain the better control of the system robustness. This structure prevents the desynchronisation between encoder and decoder due to selective embedding. The experimental results obtained for Spread Spectrum (SS) transformed domain watermarking demonstrate the efficiency of the proposed system. This algorithmic architecture utilizes the existing allocated bandwidth in the data transmission channel in a more efficient manner.