Ownership authentication by using the combination of Arnold transformation and wavelet transformation in semi fragile watermarking

Abstract

Watermark techniques are one of the traditional technologies to protect the information from illegal copying. It protects the authentication of the ownership rights. This paper proposes the semi fragile watermarking process which is robust and secure. In this algorithm, the combination of type-1 Discrete Wavelet Transformation and Arnold transformation was used to get the good Peak Signal to Noise Ratio (PSNR). The watermark is generated from the original image by obtaining low frequency LL sub band and embedded by using the High frequency sub band HH. The similarity ratio is measured to compare the original image and watermarked image quality. Results showed that, high quality is obtained even after the embedding process and robust against all common attacks.

Keywords: Semi-fragile watermarking, Arnold Transform, Peak Signal to Noise Ratio (PSNR) and Wavelet Transformation