关键词: 图像认证, 鲁棒图像Hash, 不变矩, Radon变换, 离散傅里叶变换

Abstract: To solve image content authentication problem，a robust image Hash based on Radon Transform（RT） is presented.RT is performed on the input image，obtaining the invariant moment for translation and scaling，then Discrete Fourier Transform（DFT） is used to resist image rotation operation and reduce dimension of final Hash for image authentication.To enforce security，feature extraction is key-dependent.Experimental results show that the proposed algorithm can tolerate almost all content-preserving operations，such as scaling，rotation，JPEG compression，filtering and adding noises，while being sensitive to distinct distortion and essentially dissimilar image.

Key words: image authentication, robust image Hash, invariant moment, Radon transform, discrete fourier transform