Perceptual Hashing Method Use for Image Authentication
Zhizhong Ding · Jisuanji fangzhen · 2010
Digital images are easy to manipulated illegal and tampered with the development of a lot of multimedia applications.Image authentication techniques have recently gained great attention to the academia as well as the industry.Perceptual image hashing is the compact representation of image content or features.It is a technique suitable for use in image content authentication and image index.A novel perceptual hashing method based on non-negative matrix factorizations(NMF) and singular value decomposition(SVD) was proposed.The image is divided firstly into key-dependent overlapping blocks.Each block runs NMF to obtain the coefficient matrix that capture the local features of image.Then the coefficient matrix run SVD and use the biggest singular vectors form hash vector.Test results indicate that the proposed method is robust against content-preserving modifications such as JPEG compression and at the same time,is capable of localizing image malicious tampering.