Abstract: A digital watermarking algorithm based on block energy analysis in wavelet domain is proposed.The third level detail sub-images decomposed from the original image using three levels Discrete Wavelet Transform（DWT） are divided into non-overlap blocks.According to the characteristics of Human Visual System（HVS），insensitive to the image’s texture and edges，the meaningful watermarking information is embedded into the larger energy blocks.The experimental results demonstrate that the proposed watermarking algorithm is not only invisible，but also robust to many attacks，such as JPEG，noise and filtering etc.

Key words: digital image, digital watermarking, Discrete Wavelet Transform（DWT）, block energy

摘要： 提出一种小波域基于块能量分析的数字水印算法。该算法将载体图像三级小波分解的第三级细节子图分为互不重叠的系数块，根据人眼对图像的纹理和边缘不敏感的视觉特性，选择能量较大的块系数嵌入有意义水印。实验结果表明：该算法嵌入的数字水印具有很好的隐蔽性，同时对JPEG压缩、叠加噪声、平滑滤波等攻击具有很好的鲁棒性。

关键词: 数字图像, 数字水印, 离散小波变换（DWT）, 块能量