ROBUST AND ADAPTIVE DIGITAL WATERMARKING

We propose a new wavelet-based watermarking technique. The key idea of our scheme is to combine two ideas: multiresolution representation of image and odd-even quantization embedding/extracting watermark. Because many complementary watermarks need to be hidden, the watermark image designed is image-adaptive. The meaningful and complementary watermark images was embedding into the original image (host image) by odd-even quantization modifying coefficients, which was selected form the details wavelet coefficients of the original image, if their magnitudes are larger than their corresponding Just Noticeable Difference thresholds. The tests show good robustness against best-known attacks. Further research may improve the performance by refining JND thresholds.