Improved performance of image watermarking by reducing luminance bias
ISCIT'09 Proceedings of the 9th international conference on Communications and information technologies
A perceptually tuned watermarking scheme for color images
IEEE Transactions on Image Processing
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In this paper, a wavelet-based perceptual watermarking considering human visual system (HVS) that is proposed by Barni et al. (see IEEE Trans. Image Processing., vol.10, no.5, p.783-791, 2001) for monotone images without embedding bit data is extended. In our method, an arbitrary length of bit data (binary pattern) can be embedded in brightness component of color images still keeping the perceptual quality of image. Pseudo random number (PN) sequence is introduced as a key to produce a watermarking code. The availability increases compared with the conventional methods. The robustness of our computationally efficient watermark extraction method to the attacks such as JPEG compression, cropping and color tone modification is shown in simulations.