Abstract:

Most of the traditional digital image scrambling algorithms belong to space domain scrambling, which disorder the positions of pixels by some transformation. The space domain scrambling is very simple but practicable. It only disorders the positions of pixels, but can not change the colors of every pixels.The scrambling algorithms based on color domain can change the statistic feature of image, but can not change the permutation feature of image. These algorithms are not secure, because it is easy to guess the outline of original image. In order to avoid these problems, the paper proposed a scrambling algorithm based on dual Zigzag transformation, which belongs to both space domain scrambling and color domain scrambling. Experiment results show that this algorithm can not only change the outline of image, but also change the statistic feature of image. In addition, the algorithm has a good image scrambling effect, high safety, and it is simple and easy to realize.

Key words: image scrambling；Zigzag transformation；space domain；color domain