In order to realize better robustness and wider applications,a new bi-watermarking algorithm was proposed,which embeded both a character watermark and a pseudo-random sequence watermark into the digital image.With utilizing the human visual masking characteristic,the sub-blocks with best abundant texture information in the wavelet approximation sub-image of the original digital image were selected adaptively according to the size of the embedded watermark,and both the character and psendo-random sequence wa...