Watermarking algorithms in general only have single function

and dual watermark algorithms have interference problems between the two watermarks.To address these issues

this paper proposes a mutual support dual watermark algorithm.Firstly embed robust watermark in the image

and then divided the image into blocks

extract measurement matrixes from the key of the robust watermark and observe each image block using these matrixes in accordance with the compressive sensing (CS) theory

the measurements are the semi-fragile watermark which will be registered as a zero-watermarking.The use of zero-watermarking can reduce the impact of visual effect on the original image by dual watermark

and effectively avoid the interference problems.The introduction of CS theory realizes the interaction between the two watermarks.On the one hand

the robust watermark provide measurement matrixes and secrecy support for the semi-fragile watermark

on the other hand

the semi-fragile watermark can Enhance the robust performance of the robust watermark and verify the authenticity of its key.