计算机应用与软件
計算機應用與軟件
계산궤응용여연건
Computer Applications and Software
2015年
8期
296-299
,共4页
高斯模糊篡改%首数字定律%离散余弦变换域%交流分量%梯度%支持向量机
高斯模糊篡改%首數字定律%離散餘絃變換域%交流分量%梯度%支持嚮量機
고사모호찬개%수수자정률%리산여현변환역%교류분량%제도%지지향량궤
Gaussian blur tampering%Leading digit law%DCT-domain%AC coefficient%Gradient%SVM
针对现有图像篡改操作中常见的高斯模糊篡改检测算法普适性不强、效率不高的缺点,提出一种基于首数字定律的检测算法。首先,提取图像的RGB三个彩色通道的离散余弦变换( DCT)域交流分量( AC系数)和梯度的首位有效数字统计特征。然后,利用支持向量机分类器训练并进行分类。最后,用从标准数据库下载大量图像与自拍图像对本算法进行验证。实验表明,该算法可以有效检测出自然图像是否经过高斯模糊篡改。
針對現有圖像篡改操作中常見的高斯模糊篡改檢測算法普適性不彊、效率不高的缺點,提齣一種基于首數字定律的檢測算法。首先,提取圖像的RGB三箇綵色通道的離散餘絃變換( DCT)域交流分量( AC繫數)和梯度的首位有效數字統計特徵。然後,利用支持嚮量機分類器訓練併進行分類。最後,用從標準數據庫下載大量圖像與自拍圖像對本算法進行驗證。實驗錶明,該算法可以有效檢測齣自然圖像是否經過高斯模糊篡改。
침대현유도상찬개조작중상견적고사모호찬개검측산법보괄성불강、효솔불고적결점,제출일충기우수수자정률적검측산법。수선,제취도상적RGB삼개채색통도적리산여현변환( DCT)역교류분량( AC계수)화제도적수위유효수자통계특정。연후,이용지지향량궤분류기훈련병진행분류。최후,용종표준수거고하재대량도상여자박도상대본산법진행험증。실험표명,해산법가이유효검측출자연도상시부경과고사모호찬개。
In this paper, we propose a new detection algorithm, it is based on leading digit law, to cope with the defects of poor universali-ty and inefficiency of Gaussian blur tampering detection algorithm which are common in existing image tampering operations.First, it extracts the statistics features of valid leading digits in regard to the AC coefficients of DCT-domains and the gradients from RGB three channels of the image respectively.Secondly, it employs the support vector machines ( SVM) classifier to train and to classify those unknown examples.Last-ly, it uses a number of images downloaded from standard database and the self-shot photos to verify this algorithm.Experiments show that the proposed algorithm can effectively detect whether a natural image has been tampered by Gaussian blurs operation.