Robust Image Hashing Using NMF and Ring partition for Image Analysis

Image hashing is an efficient technique for indexing and can be effectively used in image retrieval .This paper uses image hashing with a ring partition and a non-negative matrix factorization(NMF),which provides rotation robustness and good discriminative capability respectively. The aim of ring partition in image hashing is to construct a rotation invariant secondary image for dimensionality reduction. In addition, NMF coefficients are linearly changed by content-preserving manipulations so as to measure hash similarity with correlation coefficient. Our approach is efficient in producing hash code for images which gets stored in the database for image retrieval.