Gray-level adaptive blind watermarking based on human visual perception
Bo Zhang · Journal of China Institute of Communications · 2003
We propose a gray-level adaptive blind watermarking arithmetic based on wavelet transform and visual perception character. This arithmetic divides the wavelet coefficients of carrier image into 18 classes by the background luminance, the texture and the edge mask character of visual system; then after compressing the 256-level watermark image, it embeds the watermark sequences in the carrier image with different intensity according to the coefficients classes of carrier image. This arithmetic can detect the digital watermark without the original carrier image and the original watermark. Experimental results prove that this arithmetic can hide the gray-level watermark efficiently in the carrier image, and it is robust enough to resist some image degradation processing such as clipping, JPEG compression, adding noise, image enhancing, filtering and so on.