In this paper we propose a watermarking system that uses the biorthogonal discrete wavelet transform, DWT and the message is encoded before embedding. The proposed watermarking method is very simple, implying four steps: turbo coding of the watermark message, embedding the turbo coded watermark into the host image using a perceptual mask, extraction of the turbo coded watermark from the watermarked, possibly corrupted image, and turbo decoding of the watermark. The goal of this paper is the association of the DWT and duobinary turbo codes. Some simulation examples prove the performance of the proposed watermarking method

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