Upper Limit of Embedded Strength of Transformation Domain Digital Fingerprinting under Invisible Target of Image Fidelity Constraint
以影像逼真度为约束条件的变换域指纹嵌入强度

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.