图像水印技术中,如何平衡鲁棒性和不可见性是技术的难点。余数系统(Residue Number System,RNS)基于中国剩余定理(Chinese Remainder System,CRT),多用于数字信号处理等领域。论文先利用Arnold置乱水印图像,再利用RNS的算法思想将水印...图像水印技术中,如何平衡鲁棒性和不可见性是技术的难点。余数系统(Residue Number System,RNS)基于中国剩余定理(Chinese Remainder System,CRT),多用于数字信号处理等领域。论文先利用Arnold置乱水印图像,再利用RNS的算法思想将水印图像分解为三通道,分别嵌入到载体图像的RGB分量的DCT变换域当中,考虑到人眼视觉系统和水印的抗鲁棒性,嵌入的位置选择DCT变换域的中频区域。实验结果显示,算法能够很好地在彩色图像中嵌入水印,并且能够抵抗图像处理常见的攻击,如剪切、噪声、滤波等,鲁棒性较强,不可见性良好。展开更多
The E^(rns)gene of five prevalent virulent strains and one C-strain of Hog Cholera Virus were amplified by reverse transcription(RT).The amplified fragments were cloned and sequenced.Comparison and analysis were made ...The E^(rns)gene of five prevalent virulent strains and one C-strain of Hog Cholera Virus were amplified by reverse transcription(RT).The amplified fragments were cloned and sequenced.Comparison and analysis were made on the nucleotide sequence and the amino acid sequence of five prevalent virulent strains of HCV was deduced.The nucleotide homology was from 91%to 98%;the homology of amino acid was from 94%to 98%.The nucleotide homology of C-strain virus from cell cultured and five prevalent virulent strains of HCV was 83%to 84%.The amino acid homology was from 89%to 91%.展开更多
文摘图像水印技术中,如何平衡鲁棒性和不可见性是技术的难点。余数系统(Residue Number System,RNS)基于中国剩余定理(Chinese Remainder System,CRT),多用于数字信号处理等领域。论文先利用Arnold置乱水印图像,再利用RNS的算法思想将水印图像分解为三通道,分别嵌入到载体图像的RGB分量的DCT变换域当中,考虑到人眼视觉系统和水印的抗鲁棒性,嵌入的位置选择DCT变换域的中频区域。实验结果显示,算法能够很好地在彩色图像中嵌入水印,并且能够抵抗图像处理常见的攻击,如剪切、噪声、滤波等,鲁棒性较强,不可见性良好。
文摘The E^(rns)gene of five prevalent virulent strains and one C-strain of Hog Cholera Virus were amplified by reverse transcription(RT).The amplified fragments were cloned and sequenced.Comparison and analysis were made on the nucleotide sequence and the amino acid sequence of five prevalent virulent strains of HCV was deduced.The nucleotide homology was from 91%to 98%;the homology of amino acid was from 94%to 98%.The nucleotide homology of C-strain virus from cell cultured and five prevalent virulent strains of HCV was 83%to 84%.The amino acid homology was from 89%to 91%.
