Research On Robust Mobile Image Watermarking Algorithm

Currently,digital multimedia products have become an indispensable part of our daily life.When it brings us a lot of convenience,one significant problem we can not ignore is the security problem about multimedia resources.To validly protect copyrights of multimedia resources,digital watermarking is introduced as one of key technologies to remedy this situation.The general approach of digital watermarking is to implicitly embed copyright information into the corresponding multimedia resources.We can extract those mark information if needed.Referring to the fact that those embedded copyright information can be destroyed or removed by some digital watermark attack technologies,it urges us to study more robust digital watermarking algorithms.In addition,the burgeoning development of mobile devices further enhance this type of requirements.In this paper,we focused on studying digital image watermarking technologies used in mobile phone.Firstly,we analyzed the characteristics of several representative digital watermarking algorithms in detail,which correspond to the most common used geometric attack methods.Based on OTCHF(Optimal Trade-off Circular Harmonic Function)filter and MACE-MRH(Minimum Average Correlation Energy Mellin Radial Harmonic)filter,we then proposed a digital watermarking algorithm against geometric distortions of mobile phone images.Experimental results on UCID standard image library show that the proposed algorithm has strong robustness and lower computational complexity.