【Key words】 ART； the order of projection sequence； image reconstruction； weighted distance； prime number decomposition； multilevel；
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Prime decomposition: in many cases, know that a number is prime is not enough, it also needs to know about the number.
说明：素数分解：、在许多情况下，知道一个数是素数还不够，还需要知道它的约数。
By using the energy distribution of the wavelet decomposition, image hiding algorithm based on wavelet transformation is presented, and then improved with prime number scrambling algorithm.
利用小波分解的能量分布规律，提出了基于小波变换的图像隐藏算法，并利用素数置乱对隐藏算法作进一步的改进。
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