Multiple Digital Watermarks Embedding in Wavelet Domain with Multiple-Based Number

Based on the visual masking effect of human visual system,just noticeable difference （JND） thresholds in wavelet domain are used to precisely determine the locations for watermarks embedding and dynamically control the watermark’s strength without exceeding the thresholds.A multiple-based number system is proposed to skillfully convert the watermarks information into values to be embedded in the chosen wavelet coefficients of the owner image.This paper evaluates the capacity of the watermarking method in theory and also analyzes the possibility of inserting multiple watermarks into the owner image.It is shown with experimental results that a good tradeoff between transparency to human eye and robustness of image processing including image compression,image cropping etc is guaranteed in this method.