Abstract
Digital watermarking encrypts private information with the original data to protect the ownership rights of the digital asset. This paper suggests a brand-new nested watermarking technique (two-level watermarking technique) to protect copyrights of digital images. It based on a hybrid discrete wave transformation-Hessenberg decomposition-Singular value decomposition (DWT-HD-SVD). The gray-watermark image is first split into n parts, and each portion goes through two steps of watermarking, using two host images, using hybrid DWT-HD-SVD method and one final level of encryption (based on the Lightweight algorithm, the high-speed cryptographic method). The results of the simulation reveal that the suggested system offers a high level of imperceptibility, reliability and robustness. Also it can be used for both the colored and the grayed images.
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