基于相位和幅度谱的数字图像被动认证算法

Passive digital image authentication algorithm based on phase and amplitude spectra

针对一类单幅图像的复制遮盖篡改,提出一种基于快速傅立叶变换相位和幅度的自相关检测算法对篡改部位进行检测。利用Canny算子对篡改图像进行边缘提取,对提取的边缘图像进行分块傅立叶变换,比较块与块之间的相似性程度确认图像中被篡改的部位。实验结果表明该算法能够有效检测出图像被篡改部位,并且对图像复制部位的润饰处理和一般的噪声攻击具有鲁棒性。

To detect the forged parts in a single image with copy-move attack,an autocorrelation detection method based on phase and amplitude spectrum of FFT is proposed.Firstly,the edge of the tampered image is extracted using the canny operator.Then,the edge image is processed with block-based FFT.Finally,the similarity between blocks is calculated to locate the position of the tampered area.Experimental results indicate that the method can detect the forged parts effectively,and is robust to general attacks and retouching of the copied area.