A Faber Schauder dominant blocks based fragile watermarking scheme for image tamper detection

Abstract

The need of digital content authentication is increasing, due to the easier the digital content modification becomes, that is owing to the technology development. Several fragile watermarking based methods have been proposed to authenticate image. In such methods, a mark is embedded into the digital image to authenticate it. There is a few methods that deal with algorithm complexity, hence it can not be used for the applications that require low complexity such as real-time applications and video processing applications. We propose in this paper, a Faber Schauder dominant blocks based fragile watermarking scheme for image tamper detection. The Watermark was generated by applying Xor operation between a logo's bits and the bits of dominant blocks singular values of the image to authenticate. These dominant blocks are obtained by applying Faber Schauder Discrete Wavelet Transform (FSDWT) to that image. Since the image is characterized by its contours and its around textures which contain an important concentration of dominant coefficients -that form dominant blocks-, any image modification will result in a significant change of the dominant blocks singular values, which lead to detect the authenticity of the image. Furthermore, FSDWT is composed of simple operations, thus the algorithm have a low complexity. Experimental results and analysis demonstrate the effectiveness of the proposed method.