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对Thodi算法（Thodi D M, Rodrfguez J J. Reversible watermarking by prediction-error expansion [ C] //Proceedings of the 6th IEEE Southwest Symposium on Image Analysis and Interpretation, Lake Tahoe, Nevada, 2004 ： 21-25）进行了预测误差算法和嵌入／提取算法2方面的改进．较好地实现了大数据量信息在图像中