中山大学学报(自然科学版)
中山大學學報(自然科學版)
중산대학학보(자연과학판)
ACTA SCIENTIARUM NATURALIUM UNIVERSITATIS SUNYATSENI
2013年
5期
19-25
,共7页
图像取证%扫描图像%传感器噪声%插值检测%EM算法
圖像取證%掃描圖像%傳感器譟聲%插值檢測%EM算法
도상취증%소묘도상%전감기조성%삽치검측%EM산법
image forensic%scanned image%sensor noise%interpolation detection%EM algorithm
针对扫描图像真实性的问题,提出了应用EM算法与扫描仪传感器噪声的自然统计特性相结合的识别方法。该识别方法一共生成63维特征,用SVM进行训练,通过大量实验图像,文中对取证方法效果进行了分析研究。结果显示,扫描图像虽然在生成过程中不存在CFA插值过程,但是在被显示前,仍经过了插值运算,傅立叶频谱图仍具有周期性。该算法对SG图像(扫描图像)与CG图像、SG图像与DG图像(数码相机生成图像)之间的识别,达到了较理想的效果。
針對掃描圖像真實性的問題,提齣瞭應用EM算法與掃描儀傳感器譟聲的自然統計特性相結閤的識彆方法。該識彆方法一共生成63維特徵,用SVM進行訓練,通過大量實驗圖像,文中對取證方法效果進行瞭分析研究。結果顯示,掃描圖像雖然在生成過程中不存在CFA插值過程,但是在被顯示前,仍經過瞭插值運算,傅立葉頻譜圖仍具有週期性。該算法對SG圖像(掃描圖像)與CG圖像、SG圖像與DG圖像(數碼相機生成圖像)之間的識彆,達到瞭較理想的效果。
침대소묘도상진실성적문제,제출료응용EM산법여소묘의전감기조성적자연통계특성상결합적식별방법。해식별방법일공생성63유특정,용SVM진행훈련,통과대량실험도상,문중대취증방법효과진행료분석연구。결과현시,소묘도상수연재생성과정중불존재CFA삽치과정,단시재피현시전,잉경과료삽치운산,부립협빈보도잉구유주기성。해산법대SG도상(소묘도상)여CG도상、SG도상여DG도상(수마상궤생성도상)지간적식별,체도료교이상적효과。
Since sanned images are not generated by CFA process,a part of researchers have studied scanned image forensic around sensor pattern noise.A method is proposed to contain the statistical fea-tures of the noise image and features derived from EMalgorithm for the authenticity of the scanned image. This method generates a total of 63 dimensional feature classified by SVM.By analyzing the evidence ef-fectives and testing a large number of images,the work results show that although scanned images is not generated with CFA process,scanned images also has experienced interpolation on its Fourier spectrum map.Moreover,for the purpose of distinguish between scanned images and other images (CG,DG), this method achieves the desired results.