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基于Hide4PGP二次嵌入的音频隐写分析 被引量:1
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作者 尤娟 汤光明 《计算机工程与应用》 CSCD 北大核心 2009年第30期135-137,142,共4页
针对隐写软件Hide4PGP隐写自相关性进行研究,以隐写一次与未隐写音频和隐写一次与隐写两次音频梯度能量的变化量,和将上述音频样本三级小波分解后,各级小波域细节分量线性预测误差的统计量(均值、方差、偏度和峰度)的变化量为特征向量,... 针对隐写软件Hide4PGP隐写自相关性进行研究,以隐写一次与未隐写音频和隐写一次与隐写两次音频梯度能量的变化量,和将上述音频样本三级小波分解后,各级小波域细节分量线性预测误差的统计量(均值、方差、偏度和峰度)的变化量为特征向量,用支持向量机作分类器进行音频隐写分析。实验表明,这组特征可以有效地检测出经隐写软件Hide4PGP隐写的音频文件。在保持有效的检测率前提下,降低了特征维数,缩短了SVM分类时间,是对H.Farid所提特征的改进。 展开更多
关键词 音频隐写分析 二次嵌入 小波分解 线性预测
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From News Pools to Embedded Journalists: How Media Frame Wars and Conflicts?
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作者 Mohamed Kirat 《Journalism and Mass Communication》 2014年第1期1-12,共12页
This paper looks at the professional and ethical failure of news organizations in reporting wars, conflicts, and crises Principles of press freedom, objectivity, and impartiality are not respected, and the journalism ... This paper looks at the professional and ethical failure of news organizations in reporting wars, conflicts, and crises Principles of press freedom, objectivity, and impartiality are not respected, and the journalism practice is different in times of war from in normal times. Very often, the news organization sides with the position of its country, and the journalist becomes "nationalistic" and "patriotic" and sides with his/her country's position towards the war at the expense of impartiality, objectivity, fairness, and ethics of journalism practices. Very often, the news media are used by the military and the political forces to frame wars and conflicts along the lines of the "national security" and "national interests". The second Gulf War, 9/11 events in 2001, the Afghan War, and the third Gulf War are used as case studies to assess the different kinds of mechanisms, techniques,'and "rituals" practiced by the media to cover and report wars and conflicts to their audiences and world opinion. Results of the study suggest that an alternative theory--"government press coalition theory"——should be developed to explain journalism practices and behaviors during wars and conflicts. 展开更多
关键词 propaganda manipulation disinformation news pool embedded journalists FRAMING
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