说明：  目前比较主流的图像加密方法主要为Arnold置乱图像加密方法，本代码用于将一副图像通过Arnold置乱，生成之乱后的图像，以便达到图像加密的功能。
(The current image encryption method more mainstream mainly Arnold scrambling image encryption method, the code for an image through the Arnold scrambling, image generation rebellion, in order to achieve the function of image encryption.)