Spread Spectrum Watermarking Using HVS Model and Wavelets in JPEG 2000 Compression

This paper presents the improvement of watermarking images by the joint use of the technique of spread spectrum (robustness) and a psycho visual mask pattern (imperceptibility) in the JPEG 2000 compression. Previous work had shown the benefit of using the technique of spread spectrum in the safety of the JPEG 2000 compression. After the wavelet decomposition of the image, the brand is inserted in the high frequencies corresponding to the details. To make the tattoo more robust to detection during transmission, this is done by spreading the spectrum of the modulation mark consisting of the modulation of the signature by a pseudo random code generated using a private key. To improve the imperceptibility of the watermark, mask psycho visual HVS weighting allows the insertion force tattoo on each frequency details of the wavelet transform. Psycho visual mask reflects the sensitivity of the human eye to noise, the local brightness and distortion around the edges. Detecting the mark is made by comparison with a threshold, the correlation coefficients between the images during decompression details JPEG 2000. The obtained results after application on Lena image are then analyzed and discussed in this paper. Keywords— Watermarking, Spread Spectrum, JPEG 2000 compression, Multiresolution Analysis, HVS Model