Chaos Encryption Based DWT-SVD Watermarking

Abstract

The progress in computer network technology, processing, reproducing and distribution of digital images has becomes very easy. Apart from its advantages, it also gives an opportunity to the attacker or illegal user. Two major approaches available to protect digital images are watermarking technique and encryption technique. This paper presents a combined watermarking and encryption method to further improve the security of the images. It uses Discrete Wavelet Transform (DWT)-Singular Value Decomposition (SVD) watermarking technique and chaotic encryption method. After embedding the two watermark images into the host image it is encrypted and transmitted. At the receiver side it is decrypted and the watermarks are recovered. Simulation results prove that the proposed method is simple and more secure.

A novel watermarking scheme based on discrete wavelet transform‐singular value decomposition

“…Joseph and Anusudha presented a new image watermarking algorithm and claimed robustness against different attacks. 22 HL and LH sub-bands of the cover image performed SVD, obtained by a 2-level Haar wavelet transform. The PSNR value of the watermarked image was 69.20 dB, but there was no information on the PSNR value of the extracted watermark image.…”