基于迭代函数系统和分形插值的甲骨字形轮廓修复方法

Inpainting Method of Oracle-bone Inscriptions Based on Iterated Function System and Fractal Interpolation

甲骨字形是直接来源于出土的龟甲和兽骨上的字形,是获取高质量甲骨文字形的重要途径之一。由于书写材料本身质地的原因,以及受到污染和腐蚀,字形图像边缘锯齿形状明显,很多地方会有突起的毛刺,无法直接使用,需要对字形图像进行平滑修复处理。提出了一种基于迭代函数系统和分形插值逼近的甲骨字形修复方法。首先介绍了迭代函数系统与分形插值逼近的基本原理;接着分析了甲骨字形笔划轮廓的分形特点;提取了甲骨字形笔划轮廓的特征点;利用特征点数据构造了分形插值函数,对提取到的离散特征点数据进行分形插值与逼近;在保留甲骨字形整体风格的同时对字形笔划边缘进行平滑。实验结果显示,这一方法对甲骨字形图像的修复效果是有效的。

The image of the oracle-bone inscription comes directly from the tortoise shell and animal bone excavated underground, and it is one of the important sources of high quality oracle-bone font. The edge of the character image is jagged very much because of the writing materials and noise, and there are lots of burrs on the edge of the character image. Such image can t be employed directly before the noise is eliminated from the image. An inpainting method of oracle-bone inscription based on iterated function system and fractal interpolation is proposed. A brief introduction was given on iterated function system and fractal interpolation first, then analyzes the characteristics of the stroke edge in the character image. The fractal interpolation function is built and the stroke edges of the oracle-bone script are smoothed well with the style of the character preserved after fractal interpolation and fitting. The experimental results show that such scheme could smooth the stroke edges of oracle-bone inscription in the image well.