AN ADAPTIVE ALGORITHM FOR DIGITAL WATERMARK FUSION WITH HIGH ANTI-COMPRESSION CAPABILITY

Based on wavelet transforms, an algorithm is proposed to scramble digital images. The algorithm changes both the location and the grey grade of image points. As a result, it achieves good scrambling effects and information security. When embedding digital watermarks, the fusion factors are adjusted to maximize fusion intensity using the critical threshold of human eyes for just noticeable difference (JND). Numerical experiments show good information hiding effects and high attack resistance of the hidden images, especially the ability to resist JPEG compression. The proposed algorithm can be used to protect the copyrights of digital images, and network transmission of encrypted hidden information.