TY - JOUR AU - Xiang, Shijun AU - Yang, Jianquan PY - 2012 DA - 2012/04/04 TI - Block-based image hashing with restricted blocking strategy for rotational robustness JO - EURASIP Journal on Advances in Signal Processing SP - 77 VL - 2012 IS - 1 AB - Image hashing is a potential solution for image content authentication (a desired image hashing algorithm should be robust to common image processing operations and various geometric distortions). In the literature, researchers pay more attention to block-based image hashing algorithms due to their robustness to common image processing operations (such as lossy compression, low-pass filtering, and additive noise). However, the block-based hashing strategies are sensitive to rotation processing operations. This indicates that the robustness of the block-based hashing methods against rotation operations is an important issue. Towards this direction, in this article we propose a restricted blocking strategy by investigating effect of two rotation operations on an image and its blocks in both theoretical and experimental ways. Furthermore, we apply the proposed blocking strategy for the recently reported non-negative matrix factorization (NMF) hashing. Experimental results have demonstrated the validity of the block-based hashing algorithms with restricted blocking strategy for rotation operations. SN - 1687-6180 UR - https://doi.org/10.1186/1687-6180-2012-77 DO - 10.1186/1687-6180-2012-77 ID - Xiang2012 ER -