Robust Digital Watermark Technique for Copyright Protection

A robust digital watermark scheme using wavelet-based is presented for copyright protecting. For security, the watermarking is perturbed firstly. A mark sequence may be gotten. For embed watermark imperceptibility, wavelet decomposition for original image is realized. After the original image decomposed into single resolution level, we connect three detail wavelet coefficient matrixes into a big matrix. Mark sequence is embedded into this big matrix according to modular arithmetic. Wavelet decompositions were used for tested image when the watermark extracted, and then an inverse process is requested. The experimental results demonstrate that the proposed technique is robustness to common image processing operators. The experimental result also shows that the repeating embedding watermarking can improve the ability of resisting cropping.