Robust Image Watermarking for Tamper Detection and Self-Recovery Using SVD and RSA Methods

Jul 25, 2024

Journal CENTRAL ASIAN JOURNAL OF MATHEMATICAL THEORY AND COMPUTER SCIENCES

Issue 03

Volume 05

To The paper proposes an Image watermarking technique for identifying and self￾recovering tampered images. The system identifies tampered images by comparing the SVD values of 4X4 blocks and average pixel intensities of 2×2 blocks. In the process of SVD computation, the RGB channel images are divided into 4X4 blocks, after which a further 2X2 blocks division is executed for determination of average pixel intensity. Within the same block, tamper-detection data is entered, whereas the self-recovery data is scattered all over the image utilising inverse and RSA techniques for neighborhood block-based recovery. This method assures easy long-term self￾healing. The outputs produced from testing with 15 multiple host images in varied attacks were constantly performing better with a PSNR ratio upto an average of 45 dB.

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