In this letter, we propose a new digital image watermarking method using interval arithmetic. This is a new application of interval arithmetic. Experimental results show that the proposed method gives a watermarked image of better quality and is robust against some attacks.

In this letter, we propose new digital audio watermarking methods using interval wavelet decomposition. We develop not only non-blind type method, but also blind one. Experimental results demonstrate that the proposed methods give a watermarked audio clip of better quality and are robust against some attacks.