Widespread usage of the internet and digital communication technologies, multimedia data may be vulnerable to piracy as unauthorized users can easily alter multimedia data such as images. In this study, IWT and SVD based on human visual characteristics are proposed, to embed the watermark in the image, making it more resistant to attacks while low distortion on image quality. The watermarked image is then embedded with authentication bits obtained from the image content of 3x3 block pixels. The authentication bits are embedded into the LSB of pixel to ensure that RGB images can be authenticated if there is any tampering attacks. Various geometrical, compression, image processing attacks and tampering attacks are used to test the effectiveness of the proposed approach. Hence, the test results are compared to other dual watermarking systems. The results of these experiments show that our approached can accurately detect tampering in most cases, even when the changes made to the image affect a small number of blocks. Additionally, we found that our approach provides high robustness, even when image processing attacks are extensive. The results demonstrate the PSNR value of about 48 dB, effectiveness of our authentication approach obtained accuracy of 0.98 for tampering attacks and show that it is a promising technique for robustness of embedded copyright.
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