A Zero-Watermark Hybrid Algorithm for Remote Sensing Images Based on DCT and DFT

Abstract Remote sensing image has significant advantages such as large detection range and fast acquisition speed, so it been used in military, environmental, meteorological other fields. In order to improve the robustness of digital watermarking technology on premise that remote information is not modified, a zero algorithm based Discrete Cosine Transform (DCT) Fourier (DFT) proposed this paper. First all, color converted into grayscale image. The transformed coefficient matrix obtained by DFT, grayed host Secondly, compress amount efficiency algorithm, high frequency DCT transform. low which consistent with size watermark after selected feature After that, scrambled Arnold transform security information. Finally, zero-watermark XOR operation between saved third-party database for copyright verification. verify watermarking, paper carries out sharpening, histogram equalization, Karma transform, noise, filtering geometric attacks image, compares algorithms. NC value extracted original attacking show strong ability resist common attacks.