A feature recognition method for annular or catenary graph was proposed, which is based on decomposition of model and matching of symbol.
针对环形或链式工程图提出了基于模式分解和符号匹配的特征识别方法。
When graphs are decomposed, the system deduces productive rules and decomposing operations to , be used from geometric properties of the graph so that better graph decomposition can be obtained.
图形分解时，系统根据当前图形的几何特性，推断出要应用的产生式规则和对图形要施加的分解操作，因此可以得到一个较好的图形分解。
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