Remote Sensing Image Zero-Watermark Algorithm Based on Bemd

Abstract

In order to solve the problem of information security when acquiring and disseminating images and improve the performance of digital watermarking, this paper proposes a remote sensing image zero-watermarking algorithm based on Bidimensional Empirical Mode Decomposition (BEMD). Initially, to perform this algorithm the DCT transform is used to extract the characteristic image of the host image. In the next step, BEMD decomposition on the grayscaled image need to be performed. The number of watermarks embedding layers is determined according to the NC value of the original image without the i-th IMF layer and the original image. The information matrix of the watermark embedding layer is XORed with the characteristic image to obtain the image embedded with the watermark. The extraction of the watermark image is the XOR result of the first XOR and the attacked image. After the watermark is embedded, the image is processed with noise, enhanced processing attacks, etc., and the NC value of the extracted watermark and embedded watermark is mostly above 0.9. The experimental results show that the watermarking algorithm proposed in this paper has better anti-attack performance, stronger invisibility and robustness.