讨论了图像置乱的置乱度、置乱周期和鲁棒性。
The scrambling degree, period and robustness were discussed as well.
实验表明，给出的图像置乱度能较好地反映图像的置乱效果。
Experimental result shows that image scramble degree reflects the scramble effect well.
实验结果表明该方法具有较高的安全性，能快速达到预期的置乱度。
Experiments show that our methods have high security and can obtain expected disorder degree quickly.
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