关键词: 数字水印, 轮廓跟踪, 特征区域, 离散小波变换

Abstract: A robust watermarking algorithm is proposed in feature region of digital image.The key points are identified in vector images，and contour tracking tool is used to outline the embedded watermark region and determine the embedding position.The determined region is transformed into DWT domain.The generated watermark by a key is embedded in the most important part of transform domain in accordance with the smallest order.The watermarked part is done by inverse discrete cosine transform，and overlaid with the cut out part，the watermarked carrier image is gotten.Experimental results show that the algorithm not only guarantees the quality of visual perception image carrier，it also has good robustness against the common attacks.

Key words: digital watermarking, contour tracking, feature region, discrete wavelet domain