A Robust Image Hashing with Enhanced Randomness by Using Random Walk on Zigzag Blocking
Xi Huang, Xiaoguang Liu, Gang Wang, Ming Yang Su · 2016
Security issues are important concerns of image hashing. A type of image hashing needs to randomly divide a given image into several parts, usually rectangles. However, the security problem arises due to the rectangular shapes. So, we propose a new method which enhances the randomness by dividing the image into zigzag blocks with random walk. Security analyses are provided, and experiments show our method has good distinguishing ability compared with existing methods.