The watermark data are embedded into some proper hypercomplex frequency components and their corresponding HFT coefficients are modified to fulfill the symmetry constraint. The prerequisite, the watermarked host image in spatial domain should also be transferred in red, green, and blue channels, of embedding watermark data into the hypercomplex frequency domain is obtained.

它通過對彩色載體圖像進(jìn)行快速超復(fù)數(shù)傅氏變換女同一区二区三区，在超復(fù)數(shù)頻域選擇合適頻段嵌入水印，并且修改其對稱系數(shù)的值一级黄色电影网，保證了嵌入水印圖像仍然可以用彩色圖像的紅欧美性爱一,二,三区、綠、藍(lán)三色進(jìn)行傳輸国产丝袜调教a片免费视频。

Then, it introduces an adaptive blind watermark algorithm based on odd-even judgement. This algorithm uses the neighboring symbols mean value and the odd-even judgement to embed the watermark into the 2-level subband of the carrier image. The results of the test demonstrate that this algorithm has a good imperceptivity and robustness.

然后欧美图片性爱视频，在此基礎(chǔ)上介紹了一種基于奇偶判決的圖像自適應(yīng)盲水印算法，該算法利用圖像小波系數(shù)的相鄰特征平均值和奇偶判決法在圖像小波域的二階子帶上嵌入水印欧美日韩乱码视频夫妇野外，試驗(yàn)結(jié)果表明該方法具有不錯(cuò)的不可見性和魯棒性亚洲激情毛片网站。

In every period, do the following operations:# For each 8*8 block, do the discrete cosine transform, then take out direct current coefficient in each block, using the transformation above for each DC coefficient, the gold stands for the code of the spread-spectrum we use when embedding the different watermark bit in different frames, after all of the watermark information which we want to embed is embedded, then do the inverse discrete cosine transformation, and store the current frame in a new file.

于是利用DCT變換域的這點(diǎn)重要的幾何不變性，我們可以推導(dǎo)出一種能夠抵抗幾何攻擊的視頻水印算法欧美老妇牲交vido，即將所需要嵌入的水印信息以127位擴(kuò)頻序列作為輔助最广黄色网站免费进入，以求和值形式嵌入到DCT變換后的每個(gè)宏塊的每個(gè)DC系數(shù)當(dāng)中，具體嵌入和提取算法如下：根據(jù)使用的擴(kuò)頻序列的長度N毛片网站能看的，基于相關(guān)的嵌入器需要選取包含N幀的視頻子序列足交系列，令這N幀視頻子序列作為一個(gè)嵌入周期，對于每N幀視頻子序列做如下的操作最新囯产福利在线观看精品，#即對于每個(gè)8×8的像素塊進(jìn)行DCT變換99玖玖精品视频在线，然后取出每個(gè)DCT變換后的直流分量，對于每個(gè)DC系數(shù)α片一区，做如上所述的變換欧美日韩一区二区三区妖精，其中g(shù)old為在第k幀中嵌入第i位水印信息時(shí)使用的擴(kuò)頻碼字值，待將所有需要嵌入的水印信息全部嵌入后91亚洲高清视频在线，再做反DCT變換可以看偷拍视频的网站，保存當(dāng)前幀。

Currently familiar formulas called normalized correlation, which are used for evaluating the similarity degree of digital watermarks, showed their big shortage when expressing the similarity degree of extracted watermark and original watermark in inverse similarity.

摘要當(dāng)前常見的作為評價(jià)數(shù)字水印相似程度公式的歸一化相關(guān)值国产在线视频欧美，在表示提取出的水印與原始水印反面相似時(shí)存在很大的不足黄色免网站。

First determined the lower limit and the upper limit of picture element value is 1, then to the recovered watermark image has carried on two values processing, caused the final watermark image effect to be better.

首先確定像素值為1的下限和上限，然后對提取的水印圖像進(jìn)行了二值化處理一级一级黄，使最終的水印圖像效果更佳www.669aaa.com。

On the research of robustness of watermark there are three aspects: first, we analyze the influence of low-pass filter to digital watermark.

對魯棒水印技術(shù)問題的研究，包括以下三方面：首先国产青榴社区久久精品，分析了低通濾波對數(shù)字水印魯棒性的影響操摸插人人。

Watermark casting operates in frequency domain,embeds pseudo random sequence of real number in selected coefficients without image degradation To insert the watermark image and the original image from the original look and value and the picture basically the same.

本文主要研究針對圖像水印系統(tǒng)的算法研究，采用離散余弦的實(shí)現(xiàn)方式對圖片進(jìn)行水印的處理国产又紧又粗又黄又爽视频网站，讓插入水印后的圖片和原來的圖片從外觀和價(jià)值和原來的圖片基本一致直接看的av网站免费观看。

The robustness of watermark is vital to the practical application , which requires the watermark providing with significant data since it suffered from some intended attacks or unintended revisal

水印算法的魯棒性對于實(shí)際應(yīng)用來說是至關(guān)重要的，它要求數(shù)字水印在遭受有意的攻擊或無意的修改后韩国三级电影网站，仍能提供有意義的數(shù)據(jù)a级黄色的网站，這一性能對版權(quán)保護(hù)的應(yīng)用顯得尤為突出伊人国产在线观看。

Applied DWT to R,G,B channel correspondingly, and used three low frequent coefficients to construct a 3-level tensor. Embedding the watermark into the core tensor, which got form Tucker decomposition, could diffuse the watermark into R,G,B.

首先對彩色圖像R、G哪里看日韩无码黄片、B三通道進(jìn)行小波變換黄色视频高清免费在线观看网站，然后將獲得的三個(gè)低頻系數(shù)構(gòu)成三階張量，再經(jīng)過Tucker分解后獲得核心張量黄色视频大全免费，通過在核心張量中嵌入水印信息使得水印信息擴(kuò)散到原彩色圖像的R长沙卓海数字技术有限公司、G、B三個(gè)分量中最色A片视频。

In Chapter 2, a detailed survey on digital image watermarking is presented. InChapter 3, an optimal scheme is proposed to use Human Visual System model tocompute masking function. It will be used to control the strength of watermark signalfor optimal embedding. In Chapter 4, we propose a novel watermarking scheme based on lattice vectorquantization. Some important transform coefficients of the original image are firstlymapped into the nearest neighboring lattice points by using lattice vector quantizer,then watermark signal is added to the lattice points.

本文討論了數(shù)字圖像水印及其在多媒體安全中的應(yīng)用91黄色片免费看，主要圍繞下列問題進(jìn)行研究和創(chuàng)新：1、優(yōu)化的水印嵌入模型：本文對基于直接序列擴(kuò)頻技術(shù)的水印算法進(jìn)行了改進(jìn)久久久久久精品，根據(jù)人類視覺系統(tǒng)感知模型jjj无码高清，提出了優(yōu)化的水印嵌入模型，在不可感知性條件的限制下欧美激情A片在线播放，使水印的魯棒性達(dá)到最高91最新国精品自产拍。2、基于格矢量量化的圖像水用夥焉耐尽：本文提出了基于格矢量量化的多比特盲水印算法一级免费ww视频，不需要原始圖象就可以實(shí)現(xiàn)水印信號的檢測和譯碼花蝴蝶免费视频高清版下载。