关键词: 灰度均值,Android智能手机,数字水印,重新组织,区域替换

Abstract: In this paper,a digital watermarking algorithm based on mean gray value was proposed for the Android smart phones.In the embedding phase,the watermark after the pixel reorganization is embedded into the carrier image.In the extraction phase,the initial watermark is extracted at first,and then whether the initial watermark needs replacing its areas is determined.If necessary,the areas with a better one are replaced.Otherwise,any areas won’t be replaced.Finally,the initial watermark is transformed into the desired watermark.Experimental results show that the algorithm has a fine transparence of embedded watermark and is robust to attacks such as noise adding,compressing and cropping.

Key words: Mean gray value,Android smart phones,Digital watermarking,Reorganization,Regional replacement