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中文摘要：
提出一种基于混合距离树的高维书法字索引方法以加速检索．首先将n个书法字通过层次聚类聚成若干类，然后分别计算每个字对应的统一化始点距离和质心距离，最后将两者结合生成索引键值．给定一个查询字，借助混合距离树索引完成高维书法字的查询．实验证明，该方法能够取得较高的查询效率，特别适合海量书法字检索。
英文摘要：
The paper proposes a hybrid-distance-tree（HD-Tree）-based high-dimensional indexing method which is to facilitate and speedup the Chinese calligraphic characters retrieval. Two steps are made in HD- Tree, first for every character in high-dimensional space are grouped into T clusters using hierarchy-based cluster algorithm, then the uniform start distance and centroid distance of every characters are pre-calculated and indexed by a partition-based B＋-tree. Comprehensive experiments are conducted to indicate the efficiency of our approach which is especially suitable for the retrieval for the large Chinese calligraphic characters database.
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