以影像逼真度为约束条件的变换域指纹嵌入强度

原始图像与嵌入指纹（水印）后图像的影像逼真度取决于数字指纹的嵌入强度及嵌入版本数.在现有影像逼真度透明性指标约束下,对DCT变换域数字指纹各AC系数嵌入强度的上限进行了讨论,给出了满足影像逼真度约束的嵌入强度上限及嵌入版本数的解析表达式.该结论及其推论可作为影像逼真度透明性指标的充分条件,用于确定数字指纹或数字水印的嵌入强度及嵌入版本数等各项参量.实验结果证明了该结论的有效性.

Upper Limit of Embedded Strength of Transformation Domain Digital Fingerprinting under Invisible Target of Image Fidelity Constraint

Fidelity(similarity) of the original and embedded images is directly determined by embedded strength and the number of embedded editors. Under the constraint of invisible target according to existing image fidelity, the upper limit of embedded strength of transformation domain digital fingerprinting is discussed. Also the analytic expression of embedded strength and the number of embedded editors under the target of image fidelity constraint is presented. This conclusion and its inference can be regard as a sufficient requirement, used to determine the embedding parameter of fingerprinting such as the embedded strength and the number of embedded editors. The experimental results have proved the validity of the conclusions.