DIGITAL IMAGE WATERMARKING OF COMPRESSED IMAGE USING JPEG 2000 AND ENCRYPTION TECHNIQUE

The necessity for copyright protection,ownership v erification,and other issues for digital data are getting more and more value these days. For the rap id revolution in digital multimedia and the ease of creating similar and unauthorized data,the digital data can be copied or manipulated or distributed. So it is necessary to watermark the media content for tamper proofing or quality assessment or copy control. In this paper we propose a JPEG2000 compre ssion. The compression standard is chosen such that it provides higher compression ratio and the c ompressed byte stream are randomized by the encryption algorithm. In our paper watermarking was done in the compressed � encrypted domain. We use different watermarking techniques for this. Att empting to watermark such a randomized bit stream can cause a dramatic degradation of the media quali ty. Thus it is necessary to choose an encryption scheme that is both secure and will allow watermark ing in a predictable manner in the compressed encrypted domain. The projected method is a robust watermarking algorithm to watermark JPEG2000 compressed and encrypted images (grayscale) of size 512�512. The encryption algorithm in this paper uses stream cipher. While the estimated technique e mbeds watermark in the compressed-encrypted domain,and the extraction of watermark can be done in the encrypted domain. The proposed algorithm also conserves the confidentiality of data as the e mbedding process can be done on encrypted data. The planned method can examine the PSNR and the securit y of the proposed algorithm,using the watermarking scheme:Spread Spectrum (SS) and Scala r Costa Scheme Quantization Index Modulation https://www.ijiert.org/paper-details?paper_id=14028