RES

Upper limit of embedded strength of transformation domain digital watermarking under invisible target of improved image fidelity constraint;

以改进影像逼真度为约束条件的变换域水印嵌入强度

In this paper, an algorithm to get best scaling parameter is presented based on the characteri.

如何在水印嵌入过程中,使得这样一对矛盾达到统一,嵌入强度起着较为关键的作用。

This paper analyses how to estimate the embedding strength of digital watermarking according to the PSNR of the watermarked digital image so as to exert reasonable control of the watermarking embedding,and presents the formulas of the embedding strength.

该文分析了在DCT域中如何根据水印图像与原始图像间的PSNR来估计水印的嵌入强度,以便于对水印嵌入操作实施合理控制,就此推导出水印强度的估计公式。

This thesis is concerned with one of the most important branches in information hiding, the digital watermarking technology, with its emphasis on how to estimate the embedding strength according to the PSNR (Peek Signal-to- Noise Ratio) of digital image in DCT transform field.

本论文对当今信息安全技术中的一个重要分支——数字水印技术进行了研究，重点讨论了在DCT域中如何根据所要得到的图像的PSNR(峰值信噪比)的要求来估计水印的嵌入强度。

In view of the key issue that the development effectiveness of low permeability reservoir is enhanced by fracturing,sandstone reservoir is taken as research object,based on sandstone strength analysis,the reaction process and mechanism of the typical minerals in sandstone and acid liquid system are studied.

针对压裂改造提高低渗透油气藏开采效果的关键问题,以砂岩储层为研究对象,从砂岩强度的本质分析出发,研究了砂岩典型单矿物与酸液体系的反应过程和机理;利用矿物结构分析、离子浓度测定、衍射、能谱分析等实验研究手段,研究了砂岩酸损伤通过改变砂岩矿物成分、晶体结构,降低岩石强度的机理。