中文摘要：

提出了一种基于自适应阂值和分形几何的甲骨拓片字形图像复原方法。文章分析了甲骨拓片噪声的特点以及字形图像边缘的分形特征，通过计算自适应闽值对噪声区域进行填充。采用统计的方法计算甲骨拓片字形图像边缘的分形维数特征，对字形图像边缘进行压缩变换，进而对甲骨拓片字形图像边缘进行平滑。实验结果显示，这一方法的图像复原效果是比较明显的。

英文摘要：

A character image restoration of Jiagu rubbings method based on adaptive threshold and fractal geometry is proposed in this paper. The paper analyzes the characteristics of the image noise and the edges of the characters on Jiagu rubbings. Firstly, we estimate the adaptive threshold by means of Bayes risk function and clear the noise re gions, Then we calculate the fractal dimension of the character edge on Jiagu rubbings by means of statistics. Final- ly, we perform the transformation to the character edges so as to smooth the character edges of Jiagu rubbings im age. The experimental results show that the proposed method could smooth the character edge of Jiagu rubbings significantly.