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Robust Watermarking of Compressed and Encrypted JPEG2000 Images: Overview

The need for copyright protection, ownership verification, and other issues for digital data are getting more and more importance nowadays. Among the solutions for these issues, digital watermarking techniques are used. A range of watermarking methods has been estimated. Compression plays a significant role in the design of watermarking algorithms. For a digital watermarking method to be efficient, it is very important that an embedded watermark should be robust against compression. JPEG2000 is a new standard for image compression and transmission. The proposed method is a robust watermarking algorithm to watermark JPEG2000 compressed and encrypted images (grayscale) of size 512×512. The encryption algorithm in this method uses stream cipher algorithm. While the projected technique embeds watermark in the compressedencrypted domain, the extraction of watermark can be done in the encrypted domain. The proposed algorithm also preserves the secrecy of content as the embedding process can be done on encrypted data. The proposed method can investigate the PSNR and the security of the proposed algorithm, using the three watermarking schemes: Spread Spectrum (SS), Scalar Costa Scheme Quantization Index Modulation (SCS-QIM), and Rational Dither Modulation (RDM).