计算机科学 ›› 2014, Vol. 41 ›› Issue (Z11): 136-138.
刘丽娟,林小竹
LIU Li-juan and LIN Xiao-zhu
摘要: 数字图像在成像过程中会产生特定的背景噪声,如果两幅不同噪声的图像拼接在一起,篡改区域和其他区的噪声会有差异。提出一种基于偏度统计特性的背景噪声估计算法,其通过对图像分块计算每块的噪声标准差,从而检测出噪声异常部分以达到篡改检测的目的。算法利用DCT变换去除原图细节部分,利用偏度统计特性估计噪声,利用条件最小值法求出噪声的标准差。算法改进了迭代求条件最小值法,利用微分方法求取最小值,避免了初始值设定问题,提高了算法的准确率。实验结果表明,提出的噪声估计算法正确率高,且对拼接篡改图像篡改检测有明显效果。
[1] Gou H,Swaminathan A,Wu M.Intrinsic sensor noise featuresfor forensic analysis on scanners and scanned images[J].IEEE Transactions on Information Forensics and Security,2009,4(3):476-491 [2] 李哲,郑江滨.基于噪声分布规律的伪造图像盲检测算法[J].计算机应用研究,2009,6(3):1092-1094 [3] Donoho D L,Johnstone J M.Ideal spatial adaptation by waveletshrinkage[J].Biometrika,1994,81(3):425-455 [4] Mahdian B,Saic S.Using noise inconsistencies for blind imageforensics[J].Image and Vision Computing,2009,27(10):1497-1503 [5] Li T,Wang M,Li T.Estimating noise parameter based on thewavelet coefficients estimation of original image[C]∥2010 International Conference on Challenges in Environmental Science and Computer Engineering (CESCE).IEEE,2010,1:126-129 [6] Luká J,Fridrich J,Goljan M.Detecting digital image forgeries using sensor pattern noise[C]∥International Society for Optics and Photonics Electronic Imaging 2006.2006:60720Y-60720Y-11 [7] Popescu A C,Farid H.Statistical tools for digital forensics[C]∥Information Hiding.Springer Berlin Heidelberg,2005:128-147 [8] 张晖,张荣,尹东.使用背景噪声盲估计的图像真伪鉴别[J].中国图像图形学报,2010,5(12):1738-1741 [9] 卢燕飞,鞠娅莉,于跃.基于图像背景噪声特性的篡改检测[J].信号处理,2012,8(9):1299-1307 [10] Zoran D,Weiss Y.Scale invariance and noise in natural images[C]∥2009 IEEE 12th International Conference on Computer Vision.IEEE,2009:2209-2216 [11] Pan X,Zhang X,Lyu S.Exposing image forgery with blind noise estimation[C]∥Proceedings of the Thirteenth ACM Multimedia Workshop on Multimedia and Security.ACM,2011:15-20 [12] Pan X,Zhang X,Lyu S.Exposing image splicing with inconsistent local noise variances[C]∥2012 IEEE International Conference on Computational Photography (ICCP).IEEE,2012:1-10 [13] Franzen R.Kodak lossless true color image suite.1999http://r0k.us/graphics/kodak [14] Schaefer G,Stich M.UCID-An Uncompressed Colour Image Database[C]∥Storage and Retrieval Methods and Applications for Multimedia.SPIE,2004:472-480 [15] Ng T T,Chang S F.Columbia Image Splicing Detection Evaluation Dataset[EB/OL].http://www.ee.columbia.edu/ln/dvmm/downloads/AuthSplicedDataSet/photographers.htm |
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