关键词: 小波变换, 分数盒维数, Arnold迭代变换, 嵌入强度函数

Abstract: This paper presents an adaptive watermarking scheme based on the feature of digital image in wavelet domain.The watermark is binary image in this scheme.An original image is divided into non-overlapped blocks，fractional box-counting dimension is used to analyze the feature of the image blocks to extract the feature blocks and secondary feature blocks and then used one level DWT to decompose them.The different strength watermark is adaptively embedded into the low- frequency coefficients of the feature blocks，under the condition that the watermark embedded is invisible，and then is embedded into the secondary feature blocks in the same way.This scheme can get a watermarked image with perceptual invisibility and strong robustness.In order to improve the security and robustness of the watermarking scheme，the watermark is scrambled using Arnold iteration transform before embedded.Experimental results demonstrate that the watermarking scheme is strongly robust to different types of attacks such as JPEG compression，noise addition，cropping，filtering and so on.

Key words: wavelet transform, fractional box-counting dimension, Arnold iteration transform, intensity function of embedding