Research on an Advanced Novel Watermarking Technology with Higher Robustness

Image watermarking has played an important role to protect and authenticate the intellectual property. One new advanced watermarking technology is presented in the paper. It incorporates two watermarks in an image to improve the protection and robustness. Before embedded in the host image, a watermark, in form of a PN sequence, is embedded in the wavelet domain of a primary watermark. It is tested by using Lena image as a host and by using the camera man as the primary watermark. The PN sequence is detectable by correlation among other five sequences, and a SNR of 44 dB was obtained. On the other hand, four types of noises are added to the watermarked image, namely luminance change, low pass filtering, compression, and salt and pepper noise. The robustness of the technology is tested by this method. In all above cases the watermark is easy to detect.