例句與用法

1. 2 . designing a authentication algorithm based on self - embedded watermarking , for needs of electrionic authentication
   針對應(yīng)用于電子證據(jù)等場合的實際需要，設(shè)計了基于自嵌入水印的認(rèn)證算法。
2. This method has many advantages compared to the latter and is testified by many images . ( 2 ) because fractal coding has the characteristic of high compression ratio , this thesis designed a spatial self - embedding watermarking technique . after self - embedding , it can detect any changes to a watermarked image as well as localizing the areas that have been tampered
   ( 2 )鑒于分形圖像壓縮具有很高的壓縮比且重構(gòu)圖像效果好的優(yōu)點，本文利用分形壓縮實現(xiàn)了一種空域自嵌入水印算法，不但能對篡改區(qū)域進行有效定位，而且具有修復(fù)功能。
3. If possible try to recover portions of the image that have been tampered without accessing the original image . in the past , several techniques and concepts based on data hiding or steganography have been introduced as a means for tamper detection in digital images and for image authentication - fragile watermarks , semi - fragile watermarks , and self - embedding watermarks . the research of this thesis mainly includes self - embedding and semi - fragile watermarks
   目前用于數(shù)字圖像完整性驗證及自修復(fù)的數(shù)字水印方案主要有完全脆弱性水印、半脆弱性水印、自嵌入水印等，本文主要研究自嵌入及半脆弱數(shù)字水印，分別從空域及變換域角度詳細(xì)分析當(dāng)前國內(nèi)外現(xiàn)有的各種算法，指出其不足之處，并提出了相應(yīng)的改進算法，實驗結(jié)果表明本文算法的有效性與實用性。
4. We propose several watermarking techniques after analyzing other watermarking methods detailedly . the main contributions can be summarized as following : ( 1 ) based on previous work , we proposed an improved spatial self - embedding watermarking technique . we save the quantized dct coefficients using group encoding while not using bit matrix which restricts saving bit length of each dct coefficient
   本文的創(chuàng)新之處總結(jié)如下： ( 1 )提出了一種改進的具有修復(fù)功能的空域自嵌入水印算法，利用分組編碼保存量化后的dct系數(shù)，改善了修復(fù)效果，克服了以往使用位圖矩陣的不足，具有通用性與實用性。
5. It is also possible to recover portions of the image which have been tampered . experiments on real images verify the effectiveness of the proposed technique . ( 3 ) since the current self - embedding watermarking techniques are too fragile to resist noise or jpeg compression , we proposed a self - embedding method based on jpeg images which plays an important role in current internet environment
   ( 3 )由于現(xiàn)有的空域自嵌入水印算法大多數(shù)是對位圖圖像嵌入水印，在抗jpeg壓縮方面顯得過于脆弱，因此本文實現(xiàn)了一種直接對jpeg圖像進行自嵌入的數(shù)字水印算法，具有檢測篡改及修復(fù)功能，對于當(dāng)今網(wǎng)絡(luò)時代來講具有重要意義。