A Novel Multiple Watermarking Algorithm Based on Bandelet Transform

In this paper, the authors proposed a novel multiple watermarking algorithm which embedded two watermarks into original image in different frequency by using bandelet transform. Firstly, we can get frequency coefficients after performing a 2 dimensional discrete wavelet transform (DWT) to original image. Secondly, we implemented a bandeletization to higher coefficients then got the bandeletization coefficients. Thirdly, we embedded two watermarks into DWT coefficients and bandeletization coefficients separately. At last, we reconstructed the watermarked image. Experimental results demonstrate that the watermarking algorithm based on bandelet has a good performance both in invisibility and robustness. Compare to the common watermarking algorithms, our methods could make up for disadvantages in some respects.