A new scrambling method based on semi-frequency domain and chaotic system

A new digital image scrambling method based on DCT and chaos maps is presented in this paper. Using the chaotic system in semi-frequency domain, all the pixels of the original image are rearranged and scrambled. The procedure of the algorithm is roughly divided into three steps: first, an original image is decomposed for its first variable by 1-D DCT, then modulated by chaos system, a primary scrambling result is achieved, at last, after by inverse 1-D DCT for the scrambling result, repeating the same procedure for the second variable, a final scrambling result is obtained for the original image. To confirm the robustness of the novel method, some robustness testing experiments are carried out on the scrambling image. The experimental results shows that the method succeeds in enduring several kinds of common image attacks, such as cropping, noise and rotation