To change the situation that many methods about watermarking were based on embedding one single watermark

we presented a new compound image watermarking method

which was embedding both robust watermark and fragile watermark to one image

so that we can not only convey the ownership

but also justify whether the source image is tampered. Therefore

a multipurpose watermarking system has been designed in this paper. In addition

both the watermarks need not the source image information during the process of extracting or detecting. That is to say

our algorithm is a blind one. Simulation results show that the algorithm we present is very effective

and can be widely used in practice.