Research On Removable And High Robust Watermarking Scheme Based On Transform Domain

Transmission of information is vulnerable to theft or destruction on the Internet,especially when the information related to the relevant areas of core data,it will bring a huge industry security risks.Digital watermarking technology plays a huge role in the maintenance of digital products such as copyright.The traditional digital watermarking technology generally pursues the goal of invisibility and resistance to the robustness of attacks.In this paper,two new schemes for digital watermarking on transform domain are proposed.In addition to satisfying the above two important goals,the first scheme has the characteristic of removability,and the second can have better performance on resisting specific attacks by embedding the watermark into different channels of YCbCr color space.The main contents of this paper are as follows.(1)A removable digital watermarking scheme based on SVD is proposed.The SVD operation is performed on the blocks after the image is partitioned into nonoverlapping blocks,and the watermark bit is embedded by the relation between the largest singular values.Experimental results show that this method not only has satisfactory visual quality after embedding watermark,but also superior to others in resistance attack.More importantly,the proposed scheme can also remove the watermark and restore the original image after completing the watermark verification process,which is of great value in the field of high image quality requirements.(2)A robust watermarking scheme based on DCT in YCbCr color space is proposed.Convert the image from the RGB color space to the YCbCr color space,and DCT is performed on each channel of the YCbCr.Then the watermark bit is embedded in the intermediate frequency region of the DCT coefficients.Experimental results reveal that this method has a good performance in image quality and robustness.At the same time,the use of voting mechanism further enhances the ability of robustness.More importantly,the proposed scheme also proves that embedding digital watermark into different channels of YCbCr will have specific resistance to different types of attacks.